From f5bed991dd4b01393f90c00ebb9afe5a5f599875 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Mon, 22 Mar 2021 12:53:23 +0900 Subject: [PATCH 01/34] =?UTF-8?q?docs:CQRS=20=EC=A0=95=EB=A6=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/CQRS.md | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 8week/CQRS.md diff --git a/8week/CQRS.md b/8week/CQRS.md new file mode 100644 index 00000000..228ca24a --- /dev/null +++ b/8week/CQRS.md @@ -0,0 +1,74 @@ +# CQRS + +--- + +## CQRS 란? + +- Command and Query Responsibility Segregation (명령과 조회의 책임 분리) 의 약자이며 이름 처럼 시스템의 명령을 처리하는 책임 / 조회를 처리하는 책임 분리 + +💁 명령 : CQRS 에서 시스템의 상태를 변경하는 작업 + +💁 조회 : CQRS 에서 시스템의 상태를 반환하는 작업 + +간단하게 CRUD ⇒ CUD / R + +--- + +## 🤔 CQRS이 왜 생겨났는가? + +- 전통적인 CRUD 아키텍쳐 기반에서 application 은 운영하다 보면 Domain Model 의 복잡도가 점점 증가 하고 이에 따라 유지 보수의 Cost 도 높아지며 Domain Model 의 변질까지 생기는 경우가 있다. + +- 이에 DDD(Domain Model Design) 의 문제점을 해결하기 위해 CQRS가 생겨 나게 됐다. + +--- + +## CQRS 예시 + +![https://s3-us-west-2.amazonaws.com/secure.notion-static.com/3d67082a-3273-4dd6-9096-89f51eeeaeb7/_2021-03-22__11.05.42.png](https://s3-us-west-2.amazonaws.com/secure.notion-static.com/3d67082a-3273-4dd6-9096-89f51eeeaeb7/_2021-03-22__11.05.42.png) + +- 위 그림은 CQRS 가 적용되지 않은 애플리케이션의 모델이다. 이는 간단한 애플리케이션에는 적합하지만 복잡해 질수록 위에서 말했던 문제점이 발생되게 된다. + - 모양이 다른 DTO 의 반환 + - 병렬작업시 경합 발생 + - 정보 검색을 위한 쿼리의 복잡성으로 성능 저하 + - 각 엔티티가 읽기 및 쓰기 작업의 대상이 되어 잘못된 데이터 노출 + +**CQRS 적용시** + +![https://s3-us-west-2.amazonaws.com/secure.notion-static.com/06c4bda0-0818-4ff7-b5c8-946e62fa02aa/_2021-03-22__11.25.12.png](https://s3-us-west-2.amazonaws.com/secure.notion-static.com/06c4bda0-0818-4ff7-b5c8-946e62fa02aa/_2021-03-22__11.25.12.png) + +- Read / Write 분리 +- 명령 데이터 중심이 아닌 작업 기반 +- 명령 동기 X 비동기 +- 쿼리가 데이터 베이스 수정 X + +읽기 저장소는 쓰기 저장소의 읽기 전용 복제본이거나 읽기 및 쓰기 저장소가 전혀 다른 구조일수 있다. + +![https://s3-us-west-2.amazonaws.com/secure.notion-static.com/d2d90f98-1bc8-4c86-be49-f6c86e55581c/_2021-03-22__12.36.04.png](https://s3-us-west-2.amazonaws.com/secure.notion-static.com/d2d90f98-1bc8-4c86-be49-f6c86e55581c/_2021-03-22__12.36.04.png) + +읽기 전용 복제본을 여러개 사용하면 읽기 전용 복제본이 응용 프로그램 인스턴스에 가까운 위치에 있는 분산 시나리오에서 쿼리 성능을 향상 시킬수 있다. + +CQRS의 일부 구현에서는 이벤트 소싱 패턴 ( 각 이벤트의 변경에 대한 값을 저장 해놓는 집합 도메인은 현재 상태만 기록함 )을 사용한다. 이는 다른 구성요소를 알리는데 동일한 이벤트를 사용할수있다는 이점을 가지고 있고 쿼리보다 효과적이다. But 복잡성을 추가하게 된다. + +--- + +## ? 그렇다면 CQRS 언제 사용을 할까 + +- 여러 사용자가 동일한 데이터를 동시에 엑세스하는 공동작업시 +- 복잡한 도메인 모델을 사용하는 프로세스를 구현할때 +- 데이터의 성능을 데이터 쓰기의 성능과 별도로 세부적으로 조정해야 할때 +- 개발자가 쓰기, 읽기에 각각 집중을 할때 + +**권장 하지 않는 경우** + +- 도메인, 비즈니스 규칙이 간단할때 +- 간단한 CRUD 스타일로 작업이 충분할때 + +--- + +## Reference + +[https://code-masterjung.tistory.com/80](https://code-masterjung.tistory.com/80) + +[https://www.popit.kr/cqrs-eventsourcing/](https://www.popit.kr/cqrs-eventsourcing/) + +[https://justhackem.wordpress.com/2016/09/17/what-is-cqrs/](https://justhackem.wordpress.com/2016/09/17/what-is-cqrs/) \ No newline at end of file From 346a5945e7a37fbc622dac9f48de50566b87b0a9 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Tue, 23 Mar 2021 14:03:05 +0900 Subject: [PATCH 02/34] feat:racingcar --- 8week/racingcar/.gitignore | 21 ++ 8week/racingcar/build.gradle | 14 ++ .../gradle/wrapper/gradle-wrapper.jar | Bin 0 -> 58910 bytes .../gradle/wrapper/gradle-wrapper.properties | 5 + 8week/racingcar/gradlew | 185 ++++++++++++++++++ 8week/racingcar/gradlew.bat | 104 ++++++++++ 8week/racingcar/settings.gradle | 2 + .../racingcar/src/main/java/Application.java | 9 + 8week/racingcar/src/main/java/domain/Car.java | 27 +++ .../src/main/java/service/RacingCarGame.java | 62 ++++++ .../racingcar/src/main/java/utils/Input.java | 35 ++++ .../src/main/java/utils/RandomUtils.java | 21 ++ 8week/racingcar/src/main/java/utils/View.java | 32 +++ 13 files changed, 517 insertions(+) create mode 100644 8week/racingcar/.gitignore create mode 100644 8week/racingcar/build.gradle create mode 100644 8week/racingcar/gradle/wrapper/gradle-wrapper.jar create mode 100644 8week/racingcar/gradle/wrapper/gradle-wrapper.properties create mode 100755 8week/racingcar/gradlew create mode 100644 8week/racingcar/gradlew.bat create mode 100644 8week/racingcar/settings.gradle create mode 100644 8week/racingcar/src/main/java/Application.java create mode 100644 8week/racingcar/src/main/java/domain/Car.java create mode 100644 8week/racingcar/src/main/java/service/RacingCarGame.java create mode 100644 8week/racingcar/src/main/java/utils/Input.java create mode 100644 8week/racingcar/src/main/java/utils/RandomUtils.java create mode 100644 8week/racingcar/src/main/java/utils/View.java diff --git a/8week/racingcar/.gitignore b/8week/racingcar/.gitignore new file mode 100644 index 00000000..76611b07 --- /dev/null +++ b/8week/racingcar/.gitignore @@ -0,0 +1,21 @@ +.DS_Store +.gradle +/build/ +!gradle/wrapper/gradle-wrapper.jar +/out/ +/target/ + +### STS ### +.apt_generated +.classpath +.factorypath +.project +.settings +.springBeans +bin/ + +### IntelliJ IDEA ### +.idea +*.iws +*.iml +*.ipr \ No newline at end of file diff --git a/8week/racingcar/build.gradle b/8week/racingcar/build.gradle new file mode 100644 index 00000000..95df5f5c --- /dev/null +++ b/8week/racingcar/build.gradle @@ -0,0 +1,14 @@ +plugins { + id 'java' +} + +group 'org.example' +version '1.0-SNAPSHOT' + +repositories { + mavenCentral() +} + 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z3-9**-9!);fwyiWB5gS$i;P~c=^}5-6G@{4TWDBRDc6(M|%qa-mS`z`u9kWo{Xl_uc;hXOkRd literal 0 HcmV?d00001 diff --git a/8week/racingcar/gradle/wrapper/gradle-wrapper.properties b/8week/racingcar/gradle/wrapper/gradle-wrapper.properties new file mode 100644 index 00000000..a4b44297 --- /dev/null +++ b/8week/racingcar/gradle/wrapper/gradle-wrapper.properties @@ -0,0 +1,5 @@ +distributionBase=GRADLE_USER_HOME +distributionPath=wrapper/dists +distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip +zipStoreBase=GRADLE_USER_HOME +zipStorePath=wrapper/dists diff --git a/8week/racingcar/gradlew b/8week/racingcar/gradlew new file mode 100755 index 00000000..fbd7c515 --- /dev/null +++ b/8week/racingcar/gradlew @@ -0,0 +1,185 @@ +#!/usr/bin/env sh + +# +# Copyright 2015 the original author or authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# https://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +############################################################################## +## +## Gradle start up script for UN*X +## +############################################################################## + +# Attempt to set APP_HOME +# Resolve links: $0 may be a link +PRG="$0" +# Need this for relative symlinks. +while [ -h "$PRG" ] ; do + ls=`ls -ld "$PRG"` + link=`expr "$ls" : '.*-> \(.*\)$'` + if expr "$link" : '/.*' > /dev/null; then + PRG="$link" + else + PRG=`dirname "$PRG"`"/$link" + fi +done +SAVED="`pwd`" +cd "`dirname \"$PRG\"`/" >/dev/null +APP_HOME="`pwd -P`" +cd "$SAVED" >/dev/null + +APP_NAME="Gradle" +APP_BASE_NAME=`basename "$0"` + +# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' + +# Use the maximum available, or set MAX_FD != -1 to use that value. +MAX_FD="maximum" + +warn () { + echo "$*" +} + +die () { + echo + echo "$*" + echo + exit 1 +} + +# OS specific support (must be 'true' or 'false'). +cygwin=false +msys=false +darwin=false +nonstop=false +case "`uname`" in + CYGWIN* ) + cygwin=true + ;; + Darwin* ) + darwin=true + ;; + MINGW* ) + msys=true + ;; + NONSTOP* ) + nonstop=true + ;; +esac + +CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar + + +# Determine the Java command to use to start the JVM. +if [ -n "$JAVA_HOME" ] ; then + if [ -x "$JAVA_HOME/jre/sh/java" ] ; then + # IBM's JDK on AIX uses strange locations for the executables + JAVACMD="$JAVA_HOME/jre/sh/java" + else + JAVACMD="$JAVA_HOME/bin/java" + fi + if [ ! -x "$JAVACMD" ] ; then + die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." + fi +else + JAVACMD="java" + which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." +fi + +# Increase the maximum file descriptors if we can. +if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then + MAX_FD_LIMIT=`ulimit -H -n` + if [ $? -eq 0 ] ; then + if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then + MAX_FD="$MAX_FD_LIMIT" + fi + ulimit -n $MAX_FD + if [ $? -ne 0 ] ; then + warn "Could not set maximum file descriptor limit: $MAX_FD" + fi + else + warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" + fi +fi + +# For Darwin, add options to specify how the application appears in the dock +if $darwin; then + GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" +fi + +# For Cygwin or MSYS, switch paths to Windows format before running java +if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then + APP_HOME=`cygpath --path --mixed "$APP_HOME"` + CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` + + JAVACMD=`cygpath --unix "$JAVACMD"` + + # We build the pattern for arguments to be converted via cygpath + ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` + SEP="" + for dir in $ROOTDIRSRAW ; do + ROOTDIRS="$ROOTDIRS$SEP$dir" + SEP="|" + done + OURCYGPATTERN="(^($ROOTDIRS))" + # Add a user-defined pattern to the cygpath arguments + if [ "$GRADLE_CYGPATTERN" != "" ] ; then + OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" + fi + # Now convert the arguments - kludge to limit ourselves to /bin/sh + i=0 + for arg in "$@" ; do + CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` + CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option + + if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition + eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` + else + eval `echo args$i`="\"$arg\"" + fi + i=`expr $i + 1` + done + case $i in + 0) set -- ;; + 1) set -- "$args0" ;; + 2) set -- "$args0" "$args1" ;; + 3) set -- "$args0" "$args1" "$args2" ;; + 4) set -- "$args0" "$args1" "$args2" "$args3" ;; + 5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; + 6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; + 7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; + 8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; + 9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; + esac +fi + +# Escape application args +save () { + for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done + echo " " +} +APP_ARGS=`save "$@"` + +# Collect all arguments for the java command, following the shell quoting and substitution rules +eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" + +exec "$JAVACMD" "$@" diff --git a/8week/racingcar/gradlew.bat b/8week/racingcar/gradlew.bat new file mode 100644 index 00000000..5093609d --- /dev/null +++ b/8week/racingcar/gradlew.bat @@ -0,0 +1,104 @@ +@rem +@rem Copyright 2015 the original author or authors. +@rem +@rem Licensed under the Apache License, Version 2.0 (the "License"); +@rem you may not use this file except in compliance with the License. +@rem You may obtain a copy of the License at +@rem +@rem https://www.apache.org/licenses/LICENSE-2.0 +@rem +@rem Unless required by applicable law or agreed to in writing, software +@rem distributed under the License is distributed on an "AS IS" BASIS, +@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +@rem See the License for the specific language governing permissions and +@rem limitations under the License. +@rem + +@if "%DEBUG%" == "" @echo off +@rem ########################################################################## +@rem +@rem Gradle startup script for Windows +@rem +@rem ########################################################################## + +@rem Set local scope for the variables with windows NT shell +if "%OS%"=="Windows_NT" setlocal + +set DIRNAME=%~dp0 +if "%DIRNAME%" == "" set DIRNAME=. +set APP_BASE_NAME=%~n0 +set APP_HOME=%DIRNAME% + +@rem Resolve any "." and ".." in APP_HOME to make it shorter. +for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi + +@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m" + +@rem Find java.exe +if defined JAVA_HOME goto findJavaFromJavaHome + +set JAVA_EXE=java.exe +%JAVA_EXE% -version >NUL 2>&1 +if "%ERRORLEVEL%" == "0" goto init + +echo. +echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:findJavaFromJavaHome +set JAVA_HOME=%JAVA_HOME:"=% +set JAVA_EXE=%JAVA_HOME%/bin/java.exe + +if exist "%JAVA_EXE%" goto init + +echo. +echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:init +@rem Get command-line arguments, handling Windows variants + +if not "%OS%" == "Windows_NT" goto win9xME_args + +:win9xME_args +@rem Slurp the command line arguments. +set CMD_LINE_ARGS= +set _SKIP=2 + +:win9xME_args_slurp +if "x%~1" == "x" goto execute + +set CMD_LINE_ARGS=%* + +:execute +@rem Setup the command line + +set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar + + +@rem Execute Gradle +"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% + +:end +@rem End local scope for the variables with windows NT shell +if "%ERRORLEVEL%"=="0" goto mainEnd + +:fail +rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of +rem the _cmd.exe /c_ return code! +if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 +exit /b 1 + +:mainEnd +if "%OS%"=="Windows_NT" endlocal + +:omega diff --git a/8week/racingcar/settings.gradle b/8week/racingcar/settings.gradle new file mode 100644 index 00000000..563821bb --- /dev/null +++ b/8week/racingcar/settings.gradle @@ -0,0 +1,2 @@ +rootProject.name = 'racingcar' + diff --git a/8week/racingcar/src/main/java/Application.java b/8week/racingcar/src/main/java/Application.java new file mode 100644 index 00000000..e20da4f1 --- /dev/null +++ b/8week/racingcar/src/main/java/Application.java @@ -0,0 +1,9 @@ +import service.RacingCarGame; + +public class Application { + public static void main(String[] args) { + RacingCarGame racingCarGame = new RacingCarGame(); + racingCarGame.start(); + + } +} diff --git a/8week/racingcar/src/main/java/domain/Car.java b/8week/racingcar/src/main/java/domain/Car.java new file mode 100644 index 00000000..23dbde40 --- /dev/null +++ b/8week/racingcar/src/main/java/domain/Car.java @@ -0,0 +1,27 @@ +package domain; + +import utils.RandomUtils; + +public class Car { + private final String name; + private int position; + + public Car(final String name) { + this.name = name; + this.position = 0; + } + + public void movePosition() { + if (RandomUtils.nextInt(0,10) > 4) { + this.position = position + 1; + } + } + + public int getPosition(){ + return position; + } + + public String getName() { + return name; + } +} diff --git a/8week/racingcar/src/main/java/service/RacingCarGame.java b/8week/racingcar/src/main/java/service/RacingCarGame.java new file mode 100644 index 00000000..203472bf --- /dev/null +++ b/8week/racingcar/src/main/java/service/RacingCarGame.java @@ -0,0 +1,62 @@ +package service; + +import domain.Car; +import utils.Input; +import utils.View; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.List; +import java.util.stream.Collectors; + +public class RacingCarGame { + private final List cars = new ArrayList<>(); + private final List winner = new ArrayList<>(); + private final static int ZERO = 0; + private int count = 0; + private int maxPosition = 0; + + public void start() { + gameSetting(); + run(this.count, cars); + getResult(cars); + } + + public void gameSetting() { + System.out.println("경주할 자동차 이름을 입력하세요.(이름은 쉼표(,) 기준으로 구분)"); + String [] carNames = Input.stringInput(); + Arrays.stream(carNames) + .forEach(carName -> cars.add(new Car(carName))); + System.out.println("시도할 회수는 몇회인가요?"); + this.count = Input.intInput(); + } + + public void getResult(List cars) { + List sortedCars = cars.stream() + .sorted((a, b) -> b.getPosition() - a.getPosition()) + .collect(Collectors.toList()); + setMaxPosition(sortedCars); + for (Car car : sortedCars) { + if (maxPosition == car.getPosition()) { + winner.add(car); + } + } + View.resultView(winner); + } + + public void setMaxPosition(List sortedcars) { + this.maxPosition = sortedcars.get(ZERO).getPosition(); + } + + public void run(int count, List cars) { + System.out.println("실행결과"); + for (int times = ZERO; times < count; times++){ + for (Car car : cars) { + car.movePosition(); + View.carNameView(car.getName()); + View.distanceView(car.getPosition()); + } + System.out.println(); + } + } +} diff --git a/8week/racingcar/src/main/java/utils/Input.java b/8week/racingcar/src/main/java/utils/Input.java new file mode 100644 index 00000000..d2519966 --- /dev/null +++ b/8week/racingcar/src/main/java/utils/Input.java @@ -0,0 +1,35 @@ +package utils; + +import java.io.BufferedReader; +import java.io.IOException; +import java.io.InputStreamReader; +import java.util.Scanner; + +public class Input { + + private Input() {}; + + public static String[] stringInput() { + try { + BufferedReader bf = new BufferedReader(new InputStreamReader(System.in)); + String buffer = bf.readLine(); + if (buffer.contains(" ")){ + throw new IllegalArgumentException("잘못된 입력입니다."); + } + return buffer.split(","); + } catch (IOException e) { + throw new IllegalArgumentException("잘못된 입력입니다."); + } + } + + public static int intInput() { + try { + Scanner scanner = new Scanner(System.in); + int count = scanner.nextInt(); + return count; + } catch (IllegalArgumentException e) { + throw new IllegalArgumentException("잘못된 입력입니다."); + } + } + +} diff --git a/8week/racingcar/src/main/java/utils/RandomUtils.java b/8week/racingcar/src/main/java/utils/RandomUtils.java new file mode 100644 index 00000000..d9936313 --- /dev/null +++ b/8week/racingcar/src/main/java/utils/RandomUtils.java @@ -0,0 +1,21 @@ +package utils; + +import java.util.Random; + +public class RandomUtils { + private static final Random RANDOM = new Random(); + private RandomUtils() { + } + public static int nextInt(final int startInclusive, final int endInclusive) { + if (startInclusive > endInclusive) { + throw new IllegalArgumentException(); + } + if (startInclusive < 0) { + throw new IllegalArgumentException(); + } + if (startInclusive == endInclusive) { + return startInclusive; + } + return startInclusive + RANDOM.nextInt(endInclusive - startInclusive + 1); + } +} diff --git a/8week/racingcar/src/main/java/utils/View.java b/8week/racingcar/src/main/java/utils/View.java new file mode 100644 index 00000000..e6be8970 --- /dev/null +++ b/8week/racingcar/src/main/java/utils/View.java @@ -0,0 +1,32 @@ +package utils; + +import domain.Car; + +import java.util.List; + +public class View { + + private View() {}; + + public static void distanceView(final int positon) { + for (int count = 0; count < positon; count ++) { + System.out.print("-"); + } + System.out.println(); + } + + public static void carNameView(final String name){ + System.out.print(name + " : "); + } + + public static void resultView(final List cars){ + System.out.print("최종 우승자 : "); + for (int index = 0; index< cars.size(); index++) { + if (index+1 == cars.size()) { + System.out.print(cars.get(index).getName()); + break; + } + System.out.print(cars.get(index).getName() + ", "); + } + } +} From a7717f0a3cd52133dccae2864dc48d13e031b326 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Wed, 24 Mar 2021 13:21:16 +0900 Subject: [PATCH 03/34] =?UTF-8?q?docs:=EB=94=94=EB=AF=B8=ED=84=B0=20?= =?UTF-8?q?=EB=B2=95=EC=B9=99?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../src/main/java/service/RacingCarGame.java | 1 + ...0\355\204\260 \353\262\225\354\271\231.md" | 120 ++++++++++++++++++ 2 files changed, 121 insertions(+) create mode 100644 "8week/\353\224\224\353\257\270\355\204\260 \353\262\225\354\271\231.md" diff --git a/8week/racingcar/src/main/java/service/RacingCarGame.java b/8week/racingcar/src/main/java/service/RacingCarGame.java index 203472bf..101e4e9e 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGame.java +++ b/8week/racingcar/src/main/java/service/RacingCarGame.java @@ -59,4 +59,5 @@ public void run(int count, List cars) { System.out.println(); } } + } diff --git "a/8week/\353\224\224\353\257\270\355\204\260 \353\262\225\354\271\231.md" "b/8week/\353\224\224\353\257\270\355\204\260 \353\262\225\354\271\231.md" new file mode 100644 index 00000000..3de0be52 --- /dev/null +++ "b/8week/\353\224\224\353\257\270\355\204\260 \353\262\225\354\271\231.md" @@ -0,0 +1,120 @@ +## 디미터 +--- + +- 디미터 법칙의 시초 : 디미터라는 프로젝트를 진행중 다른 객체와의 협력을 하는 객체지향프로그래밍에서 협력의 경로를 제한 시켜두면 결합도가 낮아진다는 점을 발견하고 만들어낸 법칙이다. + +**간단하게 한줄에 . 하나만 찍는다고 표현한다.** + +--- + +## Don't talk strangers + +**핵심** + +- 객체의 구조를 따라 멀리 떨어져있는 객체를 get 을 통해 불러오거나, 메세지를 보내지마라 + - 객체 내부에 있는 내용, 메세지를 통해 얻은 정보만 사용해야한다. + + → 객체가 알아야하는 다른 객체의 내용을 최소화 하라! + + 💁 **Principle of least knowledge ( 최소 지식 원칙 )** + +**EX)** + +- getter를 사용해 현재 객체에서 다른 객체의 내용을 불러온다 ⇒ 디미터 법칙 위반 + +```java +public class Post { + private final List comments; + + public Post(List comments) { + this.comments = comments; + } + + public List getComments() { + return comments; + } +} +``` + +```java +public class Board { + private final List posts; + + public Board(List posts) { + this.posts = posts; + } + + public void addComment(int postsId, String content) { + posts.get(postId).getComments().add(new Comment(content)); + } + +} +``` + +- 위 코드에서 Board 객체의 addComment 부분이 디미터 법칙에 위반되는 부분이다. + +--- + +## 그렇다면 왜? + +**IF** + +- 위에 코드에서 List comments ⇒ Comments 라는 일급 컬렉션으로 수정이 된다면? + +```java +public void addComment(int postId, String content) { + posts.get(postId).getComments().add(new Comment(content)); +} +``` + +- 다음 코드에서 오류가 나게 된다. 이렇게 된다면 Board 객체는 Post 객체의 변화에도 영향을 받고 Comment 객체의 변화에도 영향을 준다. + +--- + + + +## 규칙화 + +- 노출을 제한 하기 위해 다음과 같은 규칙을 지켜야한다. + +1. 객체 자신의 메서드 사용 +2. 메서드의 파라미터로 넘어온 객체들의 메서드 사용 +3. 메서드 내부에서 생성, 초기화된 객체의 메서드만 사용 +4. 인스턴스 변수로 가지고 있는 객체가 소유한 메서드 사용 + +```java +Class Demeter { + private Member member; + + public myMethod(OtherObject other) { + } + + public okLawOfDemeter(Paramemter param) { + myMethod(); // 1 + param.paramMethod(); // 2 + Local local = new local(); // 3 + local.localMethod(); + member.memberMethod(); // 4 + } +} +``` + +- 이 규칙을 지킨다면 결합도가 내려가 에러가 적고, 변화에 유연하게 대처가 가능한 클래스를 만들수있다. + +--- + + + +## 주의사항 + +- 자료구조라면 디미터 법칙을 거론할 필요 X + - 자료구조는 내부 구조를 노출 해야하므로 디미터 법칙 필요 X +- 하나의 .을 강제 하는 규칙이 아니다. + - 결합도 문제 ⇒ 객체 내부 구조가 외부로 노출 + - 따라서 .을 사용하더라도 객체 내부 구조가 캡슐화 되어 외부로 노출 되지 않는다면 상관없다. + +--- + +## Reference + +[https://dundung.tistory.com/203](https://dundung.tistory.com/203) \ No newline at end of file From 53f45848be83e9490eae66544a566c8ce1a2bfc0 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Thu, 25 Mar 2021 10:39:59 +0900 Subject: [PATCH 04/34] =?UTF-8?q?refactor:0,10,4=EC=9D=98=20=EC=83=81?= =?UTF-8?q?=EC=88=98=ED=99=94?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/domain/Car.java | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/8week/racingcar/src/main/java/domain/Car.java b/8week/racingcar/src/main/java/domain/Car.java index 23dbde40..69fb30e5 100644 --- a/8week/racingcar/src/main/java/domain/Car.java +++ b/8week/racingcar/src/main/java/domain/Car.java @@ -5,6 +5,9 @@ public class Car { private final String name; private int position; + private static final int START_NUMBER = 0; + private static final int FINISH_NUMBER = 10; + private static final int CONTROL_POINT = 4; public Car(final String name) { this.name = name; @@ -12,7 +15,7 @@ public Car(final String name) { } public void movePosition() { - if (RandomUtils.nextInt(0,10) > 4) { + if (RandomUtils.nextInt(START_NUMBER,FINISH_NUMBER) > CONTROL_POINT) { this.position = position + 1; } } From e066d5cf59bae3fdca040b832400fbf516321491 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Thu, 25 Mar 2021 10:41:44 +0900 Subject: [PATCH 05/34] =?UTF-8?q?refactor:setMaxPostion=EB=84=A4=EC=9D=B4?= =?UTF-8?q?=EB=B0=8D=20=EB=B3=80=EA=B2=BD?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/service/RacingCarGame.java | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/8week/racingcar/src/main/java/service/RacingCarGame.java b/8week/racingcar/src/main/java/service/RacingCarGame.java index 101e4e9e..5afe68f1 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGame.java +++ b/8week/racingcar/src/main/java/service/RacingCarGame.java @@ -35,7 +35,7 @@ public void getResult(List cars) { List sortedCars = cars.stream() .sorted((a, b) -> b.getPosition() - a.getPosition()) .collect(Collectors.toList()); - setMaxPosition(sortedCars); + findMaxPosition(sortedCars); for (Car car : sortedCars) { if (maxPosition == car.getPosition()) { winner.add(car); @@ -44,7 +44,7 @@ public void getResult(List cars) { View.resultView(winner); } - public void setMaxPosition(List sortedcars) { + public void findMaxPosition(List sortedcars) { this.maxPosition = sortedcars.get(ZERO).getPosition(); } From 72cd83a9e3a84de923395db6a7c770461824cffc Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Thu, 25 Mar 2021 11:54:25 +0900 Subject: [PATCH 06/34] =?UTF-8?q?refactor:getResult=20=EB=93=A4=EC=97=AC?= =?UTF-8?q?=EC=93=B0=EA=B8=B0=20=EC=88=98=EC=A0=95?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../src/main/java/service/RacingCarGame.java | 6 +++--- 8week/racingcar/src/main/java/utils/Sort.java | 17 +++++++++++++++++ 2 files changed, 20 insertions(+), 3 deletions(-) create mode 100644 8week/racingcar/src/main/java/utils/Sort.java diff --git a/8week/racingcar/src/main/java/service/RacingCarGame.java b/8week/racingcar/src/main/java/service/RacingCarGame.java index 5afe68f1..c29f69c7 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGame.java +++ b/8week/racingcar/src/main/java/service/RacingCarGame.java @@ -2,6 +2,7 @@ import domain.Car; import utils.Input; +import utils.Sort; import utils.View; import java.util.ArrayList; @@ -32,9 +33,7 @@ public void gameSetting() { } public void getResult(List cars) { - List sortedCars = cars.stream() - .sorted((a, b) -> b.getPosition() - a.getPosition()) - .collect(Collectors.toList()); + List sortedCars = Sort.sortList(cars); findMaxPosition(sortedCars); for (Car car : sortedCars) { if (maxPosition == car.getPosition()) { @@ -44,6 +43,7 @@ public void getResult(List cars) { View.resultView(winner); } + public void findMaxPosition(List sortedcars) { this.maxPosition = sortedcars.get(ZERO).getPosition(); } diff --git a/8week/racingcar/src/main/java/utils/Sort.java b/8week/racingcar/src/main/java/utils/Sort.java new file mode 100644 index 00000000..efdaacc5 --- /dev/null +++ b/8week/racingcar/src/main/java/utils/Sort.java @@ -0,0 +1,17 @@ +package utils; + +import domain.Car; + +import java.util.List; +import java.util.stream.Collectors; + +public class Sort { + private Sort() {}; + + public static List sortList(List cars) { + List sortedCars = cars.stream() + .sorted((a, b) -> b.getPosition() - a.getPosition()) + .collect(Collectors.toList()); + return sortedCars; + } +} From d1ae11796e955770a40bae89e78ca77573780e9f Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Thu, 25 Mar 2021 12:28:10 +0900 Subject: [PATCH 07/34] =?UTF-8?q?refactor:=EA=B2=8C=EC=9E=84=20=EA=B0=9D?= =?UTF-8?q?=EC=B2=B4=20=EC=B1=85=EC=9E=84=20=EB=B6=84=EB=A6=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../src/main/java/service/RacingCarGame.java | 52 ++--------------- .../java/service/RacingCarGameController.java | 57 +++++++++++++++++++ 8week/racingcar/src/main/java/utils/View.java | 7 +++ 3 files changed, 70 insertions(+), 46 deletions(-) create mode 100644 8week/racingcar/src/main/java/service/RacingCarGameController.java diff --git a/8week/racingcar/src/main/java/service/RacingCarGame.java b/8week/racingcar/src/main/java/service/RacingCarGame.java index c29f69c7..56ae3564 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGame.java +++ b/8week/racingcar/src/main/java/service/RacingCarGame.java @@ -11,53 +11,13 @@ import java.util.stream.Collectors; public class RacingCarGame { - private final List cars = new ArrayList<>(); - private final List winner = new ArrayList<>(); - private final static int ZERO = 0; - private int count = 0; - private int maxPosition = 0; - public void start() { - gameSetting(); - run(this.count, cars); - getResult(cars); - } - - public void gameSetting() { - System.out.println("경주할 자동차 이름을 입력하세요.(이름은 쉼표(,) 기준으로 구분)"); - String [] carNames = Input.stringInput(); - Arrays.stream(carNames) - .forEach(carName -> cars.add(new Car(carName))); - System.out.println("시도할 회수는 몇회인가요?"); - this.count = Input.intInput(); - } - - public void getResult(List cars) { - List sortedCars = Sort.sortList(cars); - findMaxPosition(sortedCars); - for (Car car : sortedCars) { - if (maxPosition == car.getPosition()) { - winner.add(car); - } - } - View.resultView(winner); - } - - - public void findMaxPosition(List sortedcars) { - this.maxPosition = sortedcars.get(ZERO).getPosition(); - } - - public void run(int count, List cars) { - System.out.println("실행결과"); - for (int times = ZERO; times < count; times++){ - for (Car car : cars) { - car.movePosition(); - View.carNameView(car.getName()); - View.distanceView(car.getPosition()); - } - System.out.println(); - } + RacingCarGameController controller = new RacingCarGameController(); + List cars = controller.carSetting(); + int count = controller.countSetting(); + System.out.println(count); + controller.run(count, cars); + controller.findWinner(cars); } } diff --git a/8week/racingcar/src/main/java/service/RacingCarGameController.java b/8week/racingcar/src/main/java/service/RacingCarGameController.java new file mode 100644 index 00000000..8b47b217 --- /dev/null +++ b/8week/racingcar/src/main/java/service/RacingCarGameController.java @@ -0,0 +1,57 @@ +package service; + +import domain.Car; +import utils.Input; +import utils.Sort; +import utils.View; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.List; + +public class RacingCarGameController { + private final static int ZERO = 0; + private final List cars = new ArrayList<>(); + private final List winner = new ArrayList<>(); + private int maxPosition = 0; + + public List carSetting() { + View.introView(); + String [] carNames = Input.stringInput(); + Arrays.stream(carNames) + .forEach(carName -> cars.add(new Car(carName))); + return cars; + } + + public int countSetting() { + View.countView(); + return Input.intInput(); + } + + public void findMaxPosition(List sortedcars) { + this.maxPosition = sortedcars.get(ZERO).getPosition(); + } + + public void findWinner(List cars) { + List sortedCars = Sort.sortList(cars); + findMaxPosition(sortedCars); + for (Car car : sortedCars) { + if (maxPosition == car.getPosition()) { + winner.add(car); + } + } + View.resultView(winner); + } + + public void run(int count, List cars) { + System.out.println("실행결과"); + for (int times = ZERO; times < count; times++){ + for (Car car : cars) { + car.movePosition(); + View.carNameView(car.getName()); + View.distanceView(car.getPosition()); + } + System.out.println(); + } + } +} diff --git a/8week/racingcar/src/main/java/utils/View.java b/8week/racingcar/src/main/java/utils/View.java index e6be8970..71d153a9 100644 --- a/8week/racingcar/src/main/java/utils/View.java +++ b/8week/racingcar/src/main/java/utils/View.java @@ -29,4 +29,11 @@ public static void resultView(final List cars){ System.out.print(cars.get(index).getName() + ", "); } } + + public static void introView() { + System.out.println("경주할 자동차 이름을 입력하세요.(이름은 쉼표(,) 기준으로 구분)"); + } + public static void countView() { + System.out.println("시도할 회수는 몇회인가요?"); + } } From 1c4f320d5d9ef9c15692dfd9b78d31edeab24773 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Thu, 25 Mar 2021 12:51:29 +0900 Subject: [PATCH 08/34] =?UTF-8?q?refactor:run=20=EB=93=A4=EC=97=AC?= =?UTF-8?q?=EC=93=B0=EA=B8=B0=20=EC=88=98=EC=A0=95?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../racingcar/src/main/java/Application.java | 1 - .../src/main/java/service/RacingCarGame.java | 20 ++++---------- .../java/service/RacingCarGameController.java | 26 +++++++++++-------- 8week/racingcar/src/main/java/utils/View.java | 10 +++++++ 4 files changed, 30 insertions(+), 27 deletions(-) diff --git a/8week/racingcar/src/main/java/Application.java b/8week/racingcar/src/main/java/Application.java index e20da4f1..000ccf79 100644 --- a/8week/racingcar/src/main/java/Application.java +++ b/8week/racingcar/src/main/java/Application.java @@ -4,6 +4,5 @@ public class Application { public static void main(String[] args) { RacingCarGame racingCarGame = new RacingCarGame(); racingCarGame.start(); - } } diff --git a/8week/racingcar/src/main/java/service/RacingCarGame.java b/8week/racingcar/src/main/java/service/RacingCarGame.java index 56ae3564..4446af2c 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGame.java +++ b/8week/racingcar/src/main/java/service/RacingCarGame.java @@ -1,23 +1,13 @@ package service; -import domain.Car; -import utils.Input; -import utils.Sort; -import utils.View; +public class RacingCarGame extends RacingCarGameController { -import java.util.ArrayList; -import java.util.Arrays; -import java.util.List; -import java.util.stream.Collectors; - -public class RacingCarGame { public void start() { RacingCarGameController controller = new RacingCarGameController(); - List cars = controller.carSetting(); - int count = controller.countSetting(); - System.out.println(count); - controller.run(count, cars); - controller.findWinner(cars); + controller.carSetting(); + controller.countSetting(); + controller.run(controller.count, controller.cars); + controller.findWinner(controller.cars); } } diff --git a/8week/racingcar/src/main/java/service/RacingCarGameController.java b/8week/racingcar/src/main/java/service/RacingCarGameController.java index 8b47b217..dae282c8 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGameController.java +++ b/8week/racingcar/src/main/java/service/RacingCarGameController.java @@ -11,21 +11,21 @@ public class RacingCarGameController { private final static int ZERO = 0; - private final List cars = new ArrayList<>(); + protected final List cars = new ArrayList<>(); private final List winner = new ArrayList<>(); + protected int count; private int maxPosition = 0; - public List carSetting() { + public void carSetting() { View.introView(); String [] carNames = Input.stringInput(); Arrays.stream(carNames) .forEach(carName -> cars.add(new Car(carName))); - return cars; } - public int countSetting() { + public void countSetting() { View.countView(); - return Input.intInput(); + count = Input.intInput(); } public void findMaxPosition(List sortedcars) { @@ -44,14 +44,18 @@ public void findWinner(List cars) { } public void run(int count, List cars) { - System.out.println("실행결과"); + View.runView(); for (int times = ZERO; times < count; times++){ - for (Car car : cars) { - car.movePosition(); - View.carNameView(car.getName()); - View.distanceView(car.getPosition()); - } + carStatus(cars); System.out.println(); } } + + private void carStatus(List cars) { + for (Car car : cars) { + car.movePosition(); + View.carStatusView(car); + } + } + } diff --git a/8week/racingcar/src/main/java/utils/View.java b/8week/racingcar/src/main/java/utils/View.java index 71d153a9..c883c91f 100644 --- a/8week/racingcar/src/main/java/utils/View.java +++ b/8week/racingcar/src/main/java/utils/View.java @@ -33,7 +33,17 @@ public static void resultView(final List cars){ public static void introView() { System.out.println("경주할 자동차 이름을 입력하세요.(이름은 쉼표(,) 기준으로 구분)"); } + public static void countView() { System.out.println("시도할 회수는 몇회인가요?"); } + + public static void runView() { + System.out.println("실행결과"); + } + + public static void carStatusView(Car car) { + View.carNameView(car.getName()); + View.distanceView(car.getPosition()); + } } From 86d8c4b7d477062f421afd9af635028ee9842b63 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Thu, 25 Mar 2021 15:00:42 +0900 Subject: [PATCH 09/34] =?UTF-8?q?refactor:nextInt=20=EB=84=A4=EC=9E=84=20?= =?UTF-8?q?=EA=B5=AC=EC=B2=B4=ED=99=94?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/domain/Car.java | 2 +- 8week/racingcar/src/main/java/utils/RandomUtils.java | 12 ++++++------ 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/8week/racingcar/src/main/java/domain/Car.java b/8week/racingcar/src/main/java/domain/Car.java index 69fb30e5..4c5daec7 100644 --- a/8week/racingcar/src/main/java/domain/Car.java +++ b/8week/racingcar/src/main/java/domain/Car.java @@ -15,7 +15,7 @@ public Car(final String name) { } public void movePosition() { - if (RandomUtils.nextInt(START_NUMBER,FINISH_NUMBER) > CONTROL_POINT) { + if (RandomUtils.randomIntGenerator(START_NUMBER, FINISH_NUMBER) > CONTROL_POINT) { this.position = position + 1; } } diff --git a/8week/racingcar/src/main/java/utils/RandomUtils.java b/8week/racingcar/src/main/java/utils/RandomUtils.java index d9936313..7df94c32 100644 --- a/8week/racingcar/src/main/java/utils/RandomUtils.java +++ b/8week/racingcar/src/main/java/utils/RandomUtils.java @@ -6,16 +6,16 @@ public class RandomUtils { private static final Random RANDOM = new Random(); private RandomUtils() { } - public static int nextInt(final int startInclusive, final int endInclusive) { - if (startInclusive > endInclusive) { + public static int randomIntGenerator(final int startNumber, final int lastNumber) { + if (startNumber > lastNumber) { throw new IllegalArgumentException(); } - if (startInclusive < 0) { + if (startNumber < 0) { throw new IllegalArgumentException(); } - if (startInclusive == endInclusive) { - return startInclusive; + if (startNumber == lastNumber) { + return startNumber; } - return startInclusive + RANDOM.nextInt(endInclusive - startInclusive + 1); + return startNumber + RANDOM.nextInt(lastNumber - startNumber + 1); } } From 6e53c88641e5b7bc4ea59267b6e52f40cc0b95a7 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Fri, 26 Mar 2021 13:59:05 +0900 Subject: [PATCH 10/34] =?UTF-8?q?docs:=20=EC=9D=BC=EA=B8=89=20=EC=BB=AC?= =?UTF-8?q?=EB=A0=89=EC=85=98?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...1 \354\273\254\353\240\211\354\205\230.md" | 182 ++++++++++++++++++ 1 file changed, 182 insertions(+) create mode 100644 "8week/\354\235\274\352\270\211 \354\273\254\353\240\211\354\205\230.md" diff --git "a/8week/\354\235\274\352\270\211 \354\273\254\353\240\211\354\205\230.md" "b/8week/\354\235\274\352\270\211 \354\273\254\353\240\211\354\205\230.md" new file mode 100644 index 00000000..50b52e4a --- /dev/null +++ "b/8week/\354\235\274\352\270\211 \354\273\254\353\240\211\354\205\230.md" @@ -0,0 +1,182 @@ +--- + +# 일급 컬렉션 (First Class Collection) + +- 일급 컬렉션이란? 간단하게 말하면 Collection 들을 감싼 컬렉션을 의미함 + +```java +public class Car { + private String name; + + public Car(String name) { + this.name = name; + } +} + +Car kia = new Car("k5"); +Car hyundai = new Car("sonata"); + +public class Cars { //일급 컬렉션 + private List cars; + + public Cars(List cars) { + this.cars = this.cars; + } + + public List getCars() { + return cars; + } +} // 생성, 조회만 가능해야함 수정 X +``` + +--- + +## 일급 컬렉션 규칙 + +규칙 자체는 매우 간단하다. + +- Collection 을 포함한 객체는 다른 멤버변수를 가질수 없다. + +```java +public class Cars { //일급 컬렉션 + private List cars; + + public Cars(List cars) { + this.cars = this.cars; + } + + public List getCars() { + return cars; + } +} // 생성, 조회만 가능해야함 수정 X +``` + +--- + +## 일급 컬렉션의 이점 + +- 비즈니스에 종속적인 자료구조 +- Collection의 불변성을 보장 +- 상태와 행위를 한 곳에서 관리 +- 이름이 있는 컬렉션 + +**비즈니스에 종속적인 자료구조** + +```java +public class LottoService { + + private static final int LOTTO_NUMBERS_SIZE = 6; + + public void createLottoNumber() { + List lottoNumbers = createNonDuplicationNumbers(); + validateSize(lottoNumbers); + validateDuplicate(lottoNumbers); + } +} +``` + +- 위 코드에는 로또 서비스에서 로또번호를 만들때마다 필요한 모든 장소에서 검증 로직이 들어가게 된다. +- 위 코드만 봤을 경우에는 LottoService 안에 로또번호를 발생하기 위한 검증이 들어가게 된다. 이는 좀 어색 한것 같다. → LottoService 에서 로또번호를 만드는 부분은 분리를 해야될거 같다. +- 또 서비스의 부분이 아니라 로또 티켓이라는 도메인으로 선언을 해주고 동시에 검증을 해야할것 같다. +- 이를 해결하기위해 해당 조건으로만 생성 할수 있는 자료구조를 만들게 되면 해결할수 있다. + +```java +public class LottoTicket { + private static final int LOTTO_NUMBERS_SIZE = 6; + + private final List lottoNumbers; + + public LottoTicket(List lottoNumbers) { + validateSize(lottoNumbers); + validateDuplicate(lottoNumbers); + this.lottoNumbers = lottoNumbers; + } +} + +public class LottoService { + + public void createLottoNumbers() { + LottoTicket lottoTicket = new LottoTicket(createNonDuplicateNumbers()); + } +} + +``` + +- 다음과 같이 일급 컬렉션을 사용해 비즈니스에 종속적인 자료 구조를 만들어주면 좀더 깔끔한 코드를 만들수 있게 된다. + +**불변성 보장** + +☝️ final = 불변을 만들어주는게 아니라 재할당만 금지 시켜주는것 + +즉 new 를 통해서 재할당은 막아주지만 set 을 통한 내부값 변경은 막지 못함 + +**따라서** + +일급 컬렉션을 사용해 이를 막아줄수있다. ( set 을 포함하고 있지않은 일급 컬렉션 ) + +**상태와 행위를 한곳에서 관리** + +```java +List pays = Arrays.asList( + new Pay(NAVER_PAY, 10000), + new Pay(NAVER_PAY, 15000); +} + +Long naverPaySum = pays.stream() + .filter(pay -> pay.getPayType().equals(NAVER_PAY)) + .mapToLong(Pay::getAmount) + .sum(); + +``` + + + +- 위 코드를 살펴보면 List 에 데이터를 담고 +- Service 에서 필요한 로직을 수행한다. + + 이때 컬렉션과 계산 로직은 서로 관계가 있지만 위 코드에서는 표현이 안되어있다. + +의도는 pay 타입에 따라 지정된 메소드에서 연산이 되길 원하지만 위 코드에서는 불가능하다. 이는 메소드 중복 생성과 계산 메소드 누락을 불러올수 있다. + +이를 해결하기위해 컬렉션과 계산 메소드를 함께 두면 된다. + +```java +public class payGroups { + private List pays; + + public PayGroups(List pays) { + this.pays = pays; + } + + public Long getNaverPaySum() { + return pays.stream() + .filter(pay -> PayType.isNaverPay(pay.getPayType())) + .mapToLong(Pay::getAmount) + .sum(); + } +} +``` + +**이름이 있는 컬렉션** + +- kakaoPay 와 naverPay 의 list 는 다르다 이둘을 구분 하는 방법은 변수명을 다르게 하는건데 이때 단점이 있다. + - 검색의 어려움 + - 명확한 표현 불가능 + + 이 를 해결하기 위해 일급 컬렉션을 사용하면 + +```java +NaverPays naverPays = new NaverPays(createNaverPays()); +KakaoPays kakaoPays = new KakaoPays(createKakaoPays()); + +``` + +--- + +# Reference + +[https://jojoldu.tistory.com/412](https://jojoldu.tistory.com/412) + +[https://jackjeong.tistory.com/107](https://jackjeong.tistory.com/107) + +--- \ No newline at end of file From 9ce66ee646f4d6316e184aacb92173b995ea6995 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Sun, 28 Mar 2021 13:48:05 +0900 Subject: [PATCH 11/34] =?UTF-8?q?refactor:=EC=83=81=EC=86=8D=20=EC=82=AD?= =?UTF-8?q?=EC=A0=9C,=20setting=20=EC=88=98=EC=A0=95?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/domain/Cars.java | 15 +++++++++++++++ .../src/main/java/service/RacingCarGame.java | 5 ++--- .../java/service/RacingCarGameController.java | 17 ++++++----------- 3 files changed, 23 insertions(+), 14 deletions(-) create mode 100644 8week/racingcar/src/main/java/domain/Cars.java diff --git a/8week/racingcar/src/main/java/domain/Cars.java b/8week/racingcar/src/main/java/domain/Cars.java new file mode 100644 index 00000000..f80b2920 --- /dev/null +++ b/8week/racingcar/src/main/java/domain/Cars.java @@ -0,0 +1,15 @@ +package domain; + +import java.util.List; + +public class Cars { + private List cars; + + public Cars (List cars) { + this.cars = cars; + } + + public List getCars() { + return this.cars; + } +} diff --git a/8week/racingcar/src/main/java/service/RacingCarGame.java b/8week/racingcar/src/main/java/service/RacingCarGame.java index 4446af2c..8c49e935 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGame.java +++ b/8week/racingcar/src/main/java/service/RacingCarGame.java @@ -1,11 +1,10 @@ package service; -public class RacingCarGame extends RacingCarGameController { +public class RacingCarGame { public void start() { RacingCarGameController controller = new RacingCarGameController(); - controller.carSetting(); - controller.countSetting(); + controller.gameSetting(); controller.run(controller.count, controller.cars); controller.findWinner(controller.cars); } diff --git a/8week/racingcar/src/main/java/service/RacingCarGameController.java b/8week/racingcar/src/main/java/service/RacingCarGameController.java index dae282c8..35bf9e70 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGameController.java +++ b/8week/racingcar/src/main/java/service/RacingCarGameController.java @@ -16,30 +16,25 @@ public class RacingCarGameController { protected int count; private int maxPosition = 0; - public void carSetting() { + public void gameSetting() { View.introView(); String [] carNames = Input.stringInput(); Arrays.stream(carNames) .forEach(carName -> cars.add(new Car(carName))); - } - - public void countSetting() { View.countView(); count = Input.intInput(); } - public void findMaxPosition(List sortedcars) { + public void setMaxPosition(List sortedcars) { this.maxPosition = sortedcars.get(ZERO).getPosition(); } public void findWinner(List cars) { List sortedCars = Sort.sortList(cars); - findMaxPosition(sortedCars); - for (Car car : sortedCars) { - if (maxPosition == car.getPosition()) { - winner.add(car); - } - } + setMaxPosition(sortedCars); + sortedCars.stream() + .filter(car -> maxPosition == car.getPosition()) + .forEach(winner::add); View.resultView(winner); } From be4583c47a846a7c4f1dbb65ed912218fbc42aab Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Sun, 28 Mar 2021 15:35:05 +0900 Subject: [PATCH 12/34] =?UTF-8?q?refactor:=EC=9D=BC=EA=B8=89=20=EC=BB=AC?= =?UTF-8?q?=EB=A0=89=EC=85=98=20=EC=82=AC=EC=9A=A9?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../racingcar/src/main/java/domain/Cars.java | 27 +++++++++- .../src/main/java/service/RacingCarGame.java | 7 +-- .../java/service/RacingCarGameController.java | 49 ++++++------------- .../racingcar/src/main/java/utils/Input.java | 2 + 8week/racingcar/src/main/java/utils/View.java | 24 ++------- 5 files changed, 52 insertions(+), 57 deletions(-) diff --git a/8week/racingcar/src/main/java/domain/Cars.java b/8week/racingcar/src/main/java/domain/Cars.java index f80b2920..31e879b2 100644 --- a/8week/racingcar/src/main/java/domain/Cars.java +++ b/8week/racingcar/src/main/java/domain/Cars.java @@ -1,9 +1,13 @@ package domain; +import utils.View; + +import java.util.ArrayList; import java.util.List; +import java.util.stream.Collectors; public class Cars { - private List cars; + private final List cars; public Cars (List cars) { this.cars = cars; @@ -12,4 +16,25 @@ public Cars (List cars) { public List getCars() { return this.cars; } + + public void moveCars() { + for (Car car : cars) { + car.movePosition(); + View.carStatusView(car); + } + } + + public int findMaxPosition() { + int maxPostion = cars.stream() + .mapToInt(Car::getPosition) + .max() + .getAsInt(); + return maxPostion; + } + + public List getWinner() { + return cars.stream() + .filter(car -> car.getPosition() == findMaxPosition()) + .collect(Collectors.toCollection(ArrayList::new)); + } } diff --git a/8week/racingcar/src/main/java/service/RacingCarGame.java b/8week/racingcar/src/main/java/service/RacingCarGame.java index 8c49e935..08270bfe 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGame.java +++ b/8week/racingcar/src/main/java/service/RacingCarGame.java @@ -1,12 +1,13 @@ package service; +import domain.Cars; + public class RacingCarGame { public void start() { RacingCarGameController controller = new RacingCarGameController(); - controller.gameSetting(); - controller.run(controller.count, controller.cars); - controller.findWinner(controller.cars); + Cars cars = controller.createCar(); + controller.run(cars); } } diff --git a/8week/racingcar/src/main/java/service/RacingCarGameController.java b/8week/racingcar/src/main/java/service/RacingCarGameController.java index 35bf9e70..25d3e68e 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGameController.java +++ b/8week/racingcar/src/main/java/service/RacingCarGameController.java @@ -1,56 +1,37 @@ package service; import domain.Car; +import domain.Cars; + import utils.Input; -import utils.Sort; import utils.View; import java.util.ArrayList; import java.util.Arrays; -import java.util.List; +import java.util.stream.Collectors; public class RacingCarGameController { private final static int ZERO = 0; - protected final List cars = new ArrayList<>(); - private final List winner = new ArrayList<>(); - protected int count; - private int maxPosition = 0; + private int times; - public void gameSetting() { - View.introView(); + public Cars createCar() { String [] carNames = Input.stringInput(); - Arrays.stream(carNames) - .forEach(carName -> cars.add(new Car(carName))); - View.countView(); - count = Input.intInput(); - } - - public void setMaxPosition(List sortedcars) { - this.maxPosition = sortedcars.get(ZERO).getPosition(); + return new Cars(Arrays.stream(carNames) + .map(carName -> new Car(carName)) + .collect(Collectors.toCollection(ArrayList::new))); } - public void findWinner(List cars) { - List sortedCars = Sort.sortList(cars); - setMaxPosition(sortedCars); - sortedCars.stream() - .filter(car -> maxPosition == car.getPosition()) - .forEach(winner::add); - View.resultView(winner); + public void setTimes() { + times = Input.intInput(); } - public void run(int count, List cars) { - View.runView(); - for (int times = ZERO; times < count; times++){ - carStatus(cars); + public void run(Cars cars) { + setTimes(); + for (int time = ZERO; time < times; time++){ + cars.moveCars(); System.out.println(); } - } - - private void carStatus(List cars) { - for (Car car : cars) { - car.movePosition(); - View.carStatusView(car); - } + View.resultView(cars.getWinner()); } } diff --git a/8week/racingcar/src/main/java/utils/Input.java b/8week/racingcar/src/main/java/utils/Input.java index d2519966..a3d0d376 100644 --- a/8week/racingcar/src/main/java/utils/Input.java +++ b/8week/racingcar/src/main/java/utils/Input.java @@ -11,6 +11,7 @@ public class Input { public static String[] stringInput() { try { + System.out.println("경주할 자동차 이름을 입력하세요.(이름은 쉼표(,) 기준으로 구분)"); BufferedReader bf = new BufferedReader(new InputStreamReader(System.in)); String buffer = bf.readLine(); if (buffer.contains(" ")){ @@ -24,6 +25,7 @@ public static String[] stringInput() { public static int intInput() { try { + System.out.println("시도할 회수는 몇회인가요?"); Scanner scanner = new Scanner(System.in); int count = scanner.nextInt(); return count; diff --git a/8week/racingcar/src/main/java/utils/View.java b/8week/racingcar/src/main/java/utils/View.java index c883c91f..167d4fb3 100644 --- a/8week/racingcar/src/main/java/utils/View.java +++ b/8week/racingcar/src/main/java/utils/View.java @@ -3,6 +3,7 @@ import domain.Car; import java.util.List; +import java.util.stream.Collectors; public class View { @@ -21,25 +22,10 @@ public static void carNameView(final String name){ public static void resultView(final List cars){ System.out.print("최종 우승자 : "); - for (int index = 0; index< cars.size(); index++) { - if (index+1 == cars.size()) { - System.out.print(cars.get(index).getName()); - break; - } - System.out.print(cars.get(index).getName() + ", "); - } - } - - public static void introView() { - System.out.println("경주할 자동차 이름을 입력하세요.(이름은 쉼표(,) 기준으로 구분)"); - } - - public static void countView() { - System.out.println("시도할 회수는 몇회인가요?"); - } - - public static void runView() { - System.out.println("실행결과"); + String winner = cars.stream() + .map(Car::getName) + .collect(Collectors.joining(", ")); + System.out.println(winner); } public static void carStatusView(Car car) { From 4277ed83a4e01e6828fad81625e166c57d253348 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Sun, 28 Mar 2021 15:41:48 +0900 Subject: [PATCH 13/34] refactor:for -> peek,forEachorderd --- 8week/racingcar/src/main/java/domain/Cars.java | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/8week/racingcar/src/main/java/domain/Cars.java b/8week/racingcar/src/main/java/domain/Cars.java index 31e879b2..ea4d7c71 100644 --- a/8week/racingcar/src/main/java/domain/Cars.java +++ b/8week/racingcar/src/main/java/domain/Cars.java @@ -13,15 +13,10 @@ public Cars (List cars) { this.cars = cars; } - public List getCars() { - return this.cars; - } - public void moveCars() { - for (Car car : cars) { - car.movePosition(); - View.carStatusView(car); - } + cars.stream() + .peek(Car::movePosition) + .forEachOrdered(car-> View.carStatusView(car)); } public int findMaxPosition() { From 010001f1fe7ebb9b094d8c1a40c19d3634dce877 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Mon, 29 Mar 2021 10:50:43 +0900 Subject: [PATCH 14/34] =?UTF-8?q?refactor:Car=20=EA=B0=9D=EC=B2=B4=20?= =?UTF-8?q?=EA=B2=80=EC=A6=9D?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/domain/Car.java | 14 ++++++++++++++ 8week/racingcar/src/main/java/domain/Cars.java | 11 ++++++++--- 8week/racingcar/src/main/java/domain/Number.java | 11 +++++++++++ 8week/racingcar/src/main/java/utils/Input.java | 7 ++----- 4 files changed, 35 insertions(+), 8 deletions(-) create mode 100644 8week/racingcar/src/main/java/domain/Number.java diff --git a/8week/racingcar/src/main/java/domain/Car.java b/8week/racingcar/src/main/java/domain/Car.java index 4c5daec7..471f8c76 100644 --- a/8week/racingcar/src/main/java/domain/Car.java +++ b/8week/racingcar/src/main/java/domain/Car.java @@ -10,6 +10,8 @@ public class Car { private static final int CONTROL_POINT = 4; public Car(final String name) { + validateLength(name); + validateInput(name); this.name = name; this.position = 0; } @@ -20,6 +22,12 @@ public void movePosition() { } } + private void validateLength(String name) { + if (name.length() > 5) { + throw new IllegalArgumentException("[ERROR] 이름의 길이는 5를 넘을수 없습니다."); + } + } + public int getPosition(){ return position; } @@ -27,4 +35,10 @@ public int getPosition(){ public String getName() { return name; } + + public static void validateInput(String buffer) { + if (buffer.contains(" ")) { + throw new IllegalArgumentException("잘못된 입력입니다."); + } + } } diff --git a/8week/racingcar/src/main/java/domain/Cars.java b/8week/racingcar/src/main/java/domain/Cars.java index ea4d7c71..324bd45b 100644 --- a/8week/racingcar/src/main/java/domain/Cars.java +++ b/8week/racingcar/src/main/java/domain/Cars.java @@ -3,6 +3,8 @@ import utils.View; import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; import java.util.List; import java.util.stream.Collectors; @@ -10,13 +12,16 @@ public class Cars { private final List cars; public Cars (List cars) { - this.cars = cars; + this.cars = new ArrayList<>(cars); + } + + public List getCars() { + return Collections.unmodifiableList(this.cars); } public void moveCars() { cars.stream() - .peek(Car::movePosition) - .forEachOrdered(car-> View.carStatusView(car)); + .forEachOrdered(Car::movePosition); } public int findMaxPosition() { diff --git a/8week/racingcar/src/main/java/domain/Number.java b/8week/racingcar/src/main/java/domain/Number.java new file mode 100644 index 00000000..fde82006 --- /dev/null +++ b/8week/racingcar/src/main/java/domain/Number.java @@ -0,0 +1,11 @@ +package domain; + +public class Number { + private final int value; + + public Number(int value) { + this.value = value; + } + + +} diff --git a/8week/racingcar/src/main/java/utils/Input.java b/8week/racingcar/src/main/java/utils/Input.java index a3d0d376..cec686f7 100644 --- a/8week/racingcar/src/main/java/utils/Input.java +++ b/8week/racingcar/src/main/java/utils/Input.java @@ -14,12 +14,9 @@ public static String[] stringInput() { System.out.println("경주할 자동차 이름을 입력하세요.(이름은 쉼표(,) 기준으로 구분)"); BufferedReader bf = new BufferedReader(new InputStreamReader(System.in)); String buffer = bf.readLine(); - if (buffer.contains(" ")){ - throw new IllegalArgumentException("잘못된 입력입니다."); - } return buffer.split(","); } catch (IOException e) { - throw new IllegalArgumentException("잘못된 입력입니다."); + throw new IllegalArgumentException("[ERROR] 잘못된 입력입니다."); } } @@ -30,7 +27,7 @@ public static int intInput() { int count = scanner.nextInt(); return count; } catch (IllegalArgumentException e) { - throw new IllegalArgumentException("잘못된 입력입니다."); + throw new IllegalArgumentException("[ERROR] 잘못된 입력입니다."); } } From 786596e5ba5f248c8702fcd68c22f00365eef851 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Mon, 29 Mar 2021 11:22:09 +0900 Subject: [PATCH 15/34] =?UTF-8?q?refactor:Cars,Number=20=EA=B0=9D=EC=B2=B4?= =?UTF-8?q?=20=EA=B2=80=EC=A6=9D?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/domain/Car.java | 2 +- 8week/racingcar/src/main/java/domain/Cars.java | 10 ++++++++++ 8week/racingcar/src/main/java/domain/Number.java | 16 ++++++++++++++-- .../java/service/RacingCarGameController.java | 15 ++++++++------- 8week/racingcar/src/main/java/utils/Input.java | 13 ++++++++----- 8week/racingcar/src/main/java/utils/View.java | 4 ++++ 6 files changed, 45 insertions(+), 15 deletions(-) diff --git a/8week/racingcar/src/main/java/domain/Car.java b/8week/racingcar/src/main/java/domain/Car.java index 471f8c76..674672ee 100644 --- a/8week/racingcar/src/main/java/domain/Car.java +++ b/8week/racingcar/src/main/java/domain/Car.java @@ -38,7 +38,7 @@ public String getName() { public static void validateInput(String buffer) { if (buffer.contains(" ")) { - throw new IllegalArgumentException("잘못된 입력입니다."); + throw new IllegalArgumentException("[ERROR] 잘못된 입력입니다."); } } } diff --git a/8week/racingcar/src/main/java/domain/Cars.java b/8week/racingcar/src/main/java/domain/Cars.java index 324bd45b..a7885f6b 100644 --- a/8week/racingcar/src/main/java/domain/Cars.java +++ b/8week/racingcar/src/main/java/domain/Cars.java @@ -12,9 +12,19 @@ public class Cars { private final List cars; public Cars (List cars) { + validateCars(cars); this.cars = new ArrayList<>(cars); } + private void validateCars(List cars) { + boolean value = cars.stream() + .distinct() + .count() != cars.size(); + if (value != true) { + throw new IllegalArgumentException("[EEROR] 이름 중복"); + } + } + public List getCars() { return Collections.unmodifiableList(this.cars); } diff --git a/8week/racingcar/src/main/java/domain/Number.java b/8week/racingcar/src/main/java/domain/Number.java index fde82006..be7eb58b 100644 --- a/8week/racingcar/src/main/java/domain/Number.java +++ b/8week/racingcar/src/main/java/domain/Number.java @@ -3,9 +3,21 @@ public class Number { private final int value; - public Number(int value) { - this.value = value; + public Number(String buffer) { + validateNumber(buffer); + this.value = Integer.parseInt(buffer); } + private void validateNumber(String buffer) { + try { + int value = Integer.parseInt(buffer); + } catch (NumberFormatException e) { + throw new IllegalArgumentException("[ERROR] 시도 횟수는 숫자여야 한다."); + } + } + + public int getCount() { + return value; + } } diff --git a/8week/racingcar/src/main/java/service/RacingCarGameController.java b/8week/racingcar/src/main/java/service/RacingCarGameController.java index 25d3e68e..c279eb50 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGameController.java +++ b/8week/racingcar/src/main/java/service/RacingCarGameController.java @@ -2,6 +2,7 @@ import domain.Car; import domain.Cars; +import domain.Number; import utils.Input; import utils.View; @@ -11,8 +12,6 @@ import java.util.stream.Collectors; public class RacingCarGameController { - private final static int ZERO = 0; - private int times; public Cars createCar() { String [] carNames = Input.stringInput(); @@ -21,15 +20,17 @@ public Cars createCar() { .collect(Collectors.toCollection(ArrayList::new))); } - public void setTimes() { - times = Input.intInput(); + public Number createCount() { + return Input.numberInput(); } public void run(Cars cars) { - setTimes(); - for (int time = ZERO; time < times; time++){ + int count = createCount().getCount(); + while(count-- > 0) { cars.moveCars(); - System.out.println(); + cars.getCars().stream() + .forEach(Car->View.carStatusView(Car)); + View.spacingWord(); } View.resultView(cars.getWinner()); } diff --git a/8week/racingcar/src/main/java/utils/Input.java b/8week/racingcar/src/main/java/utils/Input.java index cec686f7..95b7eff9 100644 --- a/8week/racingcar/src/main/java/utils/Input.java +++ b/8week/racingcar/src/main/java/utils/Input.java @@ -1,5 +1,7 @@ package utils; +import domain.Number; + import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; @@ -20,13 +22,14 @@ public static String[] stringInput() { } } - public static int intInput() { + public static Number numberInput() { try { System.out.println("시도할 회수는 몇회인가요?"); - Scanner scanner = new Scanner(System.in); - int count = scanner.nextInt(); - return count; - } catch (IllegalArgumentException e) { + BufferedReader bf = new BufferedReader(new InputStreamReader(System.in)); + String buffer = bf.readLine(); + Number number = new Number(buffer); + return number; + } catch (IOException e) { throw new IllegalArgumentException("[ERROR] 잘못된 입력입니다."); } } diff --git a/8week/racingcar/src/main/java/utils/View.java b/8week/racingcar/src/main/java/utils/View.java index 167d4fb3..fc0d4899 100644 --- a/8week/racingcar/src/main/java/utils/View.java +++ b/8week/racingcar/src/main/java/utils/View.java @@ -32,4 +32,8 @@ public static void carStatusView(Car car) { View.carNameView(car.getName()); View.distanceView(car.getPosition()); } + + public static void spacingWord() { + System.out.println(); + } } From 5285a00396dc6eea3ee2d33ba98078bdc8527282 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Mon, 29 Mar 2021 11:49:29 +0900 Subject: [PATCH 16/34] =?UTF-8?q?refactor:Cars=20=EC=A4=91=EB=B3=B5=20?= =?UTF-8?q?=EC=B2=B4=ED=81=AC=20=EC=88=98=EC=A0=95?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/domain/Cars.java | 12 ++++++------ 8week/racingcar/src/main/java/utils/Sort.java | 17 ----------------- 2 files changed, 6 insertions(+), 23 deletions(-) delete mode 100644 8week/racingcar/src/main/java/utils/Sort.java diff --git a/8week/racingcar/src/main/java/domain/Cars.java b/8week/racingcar/src/main/java/domain/Cars.java index a7885f6b..dff5ab5d 100644 --- a/8week/racingcar/src/main/java/domain/Cars.java +++ b/8week/racingcar/src/main/java/domain/Cars.java @@ -3,7 +3,6 @@ import utils.View; import java.util.ArrayList; -import java.util.Collection; import java.util.Collections; import java.util.List; import java.util.stream.Collectors; @@ -17,11 +16,12 @@ public Cars (List cars) { } private void validateCars(List cars) { - boolean value = cars.stream() - .distinct() - .count() != cars.size(); - if (value != true) { - throw new IllegalArgumentException("[EEROR] 이름 중복"); + Boolean value = (int) cars.stream() + .map(car -> car.getName()) + .distinct() + .count() != cars.size(); + if (value == true) { + throw new IllegalArgumentException("[ERROR] 이름 중복"); } } diff --git a/8week/racingcar/src/main/java/utils/Sort.java b/8week/racingcar/src/main/java/utils/Sort.java deleted file mode 100644 index efdaacc5..00000000 --- a/8week/racingcar/src/main/java/utils/Sort.java +++ /dev/null @@ -1,17 +0,0 @@ -package utils; - -import domain.Car; - -import java.util.List; -import java.util.stream.Collectors; - -public class Sort { - private Sort() {}; - - public static List sortList(List cars) { - List sortedCars = cars.stream() - .sorted((a, b) -> b.getPosition() - a.getPosition()) - .collect(Collectors.toList()); - return sortedCars; - } -} From ed1ecaedb08cbf6880c4e20841625be2980fe2ac Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Tue, 30 Mar 2021 15:06:49 +0900 Subject: [PATCH 17/34] =?UTF-8?q?refactor:racingcar=20run=20=EB=A9=94?= =?UTF-8?q?=EC=86=8C=EB=93=9C=20=EC=88=98=EC=A0=95?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/service/RacingCarGame.java | 4 +++- .../src/main/java/service/RacingCarGameController.java | 6 +++--- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/8week/racingcar/src/main/java/service/RacingCarGame.java b/8week/racingcar/src/main/java/service/RacingCarGame.java index 08270bfe..458f4c28 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGame.java +++ b/8week/racingcar/src/main/java/service/RacingCarGame.java @@ -1,13 +1,15 @@ package service; import domain.Cars; +import domain.Number; public class RacingCarGame { public void start() { RacingCarGameController controller = new RacingCarGameController(); Cars cars = controller.createCar(); - controller.run(cars); + Number count = controller.createCount(); + controller.run(cars, count); } } diff --git a/8week/racingcar/src/main/java/service/RacingCarGameController.java b/8week/racingcar/src/main/java/service/RacingCarGameController.java index c279eb50..c6db69dd 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGameController.java +++ b/8week/racingcar/src/main/java/service/RacingCarGameController.java @@ -24,9 +24,9 @@ public Number createCount() { return Input.numberInput(); } - public void run(Cars cars) { - int count = createCount().getCount(); - while(count-- > 0) { + public void run(Cars cars, Number count) { + int times = count.getCount(); + while(times-- > 0) { cars.moveCars(); cars.getCars().stream() .forEach(Car->View.carStatusView(Car)); From 3072302889b509a3ba98b8afd02944d76c0f2496 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Mon, 5 Apr 2021 15:26:14 +0900 Subject: [PATCH 18/34] =?UTF-8?q?docs=20:=20=EA=B8=B0=EB=8A=A5=20=EC=A0=95?= =?UTF-8?q?=EB=A6=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/document/README.md | 84 +++++++++++++++++++ .../racingcar/src/main/java/domain/Cars.java | 2 - .../src/main/java/service/RacingCarGame.java | 2 +- 3 files changed, 85 insertions(+), 3 deletions(-) create mode 100644 8week/racingcar/document/README.md diff --git a/8week/racingcar/document/README.md b/8week/racingcar/document/README.md new file mode 100644 index 00000000..80371684 --- /dev/null +++ b/8week/racingcar/document/README.md @@ -0,0 +1,84 @@ +# RacingCar 기능정리 + +--- +## Domain + +### Car +* 아는 것 + * 차의 이름 + * 차의 위치 + * 랜덤 범위 +* 하는 것 + * 차 이동 + * 이름 검증 (공백, 길이) + +### Cars +* 아는 것 + * 복수의 차 +* 하는 것 + * 차 전체 이동 + * 가장 멀리간 차의 위치 찾기 + * 우승자 찾기 + * 차 이름 중복 검증 + +### Number +* 아는 것 + * 숫자 값 +* 하는 것 + * 변수형 검 + +--- + +## Service + +### RacingCarGame +* 아는 것 +* 하는 것 + * 게임 시작 + +### RacingCarGameController +* 아는 것 +* 하는 것 + * 차 생성 + * count 생성 + * 경주 실행 + +--- + +## Utils + +### Input +* 아는 것 +* 하는 것 + * 숫자 입력 + * 문자 입력 + +### RandomUtils +* 아는 것 + * 랜덤 라이브러리 +* 하는 것 + * 범위 내의 랜덤값 생 + + +### View +* 아는 것 +* 하는 것 + * 거리 출력 + * 차 이름 출력 + * 우승자 출력 + + + +보장된 숫자 입력 + +보장된 문자 입력 + +보장된 숫자가 아닐 시 에러가 발생한다. + +자동차 이름 중복 제거 + +자동차 이름의 길이가 5이하 보장 + +범위내의 랜덤값 생성 보장 + +String 입력을 각 항목별 분리 \ No newline at end of file diff --git a/8week/racingcar/src/main/java/domain/Cars.java b/8week/racingcar/src/main/java/domain/Cars.java index dff5ab5d..08478ceb 100644 --- a/8week/racingcar/src/main/java/domain/Cars.java +++ b/8week/racingcar/src/main/java/domain/Cars.java @@ -1,7 +1,5 @@ package domain; -import utils.View; - import java.util.ArrayList; import java.util.Collections; import java.util.List; diff --git a/8week/racingcar/src/main/java/service/RacingCarGame.java b/8week/racingcar/src/main/java/service/RacingCarGame.java index 458f4c28..8a4965b8 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGame.java +++ b/8week/racingcar/src/main/java/service/RacingCarGame.java @@ -12,4 +12,4 @@ public void start() { controller.run(cars, count); } -} +} \ No newline at end of file From fbe351b1b73832d28ce87bcff23dac1073d6607f Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Wed, 7 Apr 2021 10:23:32 +0900 Subject: [PATCH 19/34] =?UTF-8?q?refactor:Car=20=EB=A7=A4=EC=A7=81=20?= =?UTF-8?q?=EB=84=98=EB=B2=84=20=EC=BB=A8=EB=B2=A4=EC=85=98?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/domain/Car.java | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/8week/racingcar/src/main/java/domain/Car.java b/8week/racingcar/src/main/java/domain/Car.java index 674672ee..223730e5 100644 --- a/8week/racingcar/src/main/java/domain/Car.java +++ b/8week/racingcar/src/main/java/domain/Car.java @@ -8,6 +8,7 @@ public class Car { private static final int START_NUMBER = 0; private static final int FINISH_NUMBER = 10; private static final int CONTROL_POINT = 4; + private static final int MAX_INPUT_LENGTH = 5; public Car(final String name) { validateLength(name); @@ -23,7 +24,7 @@ public void movePosition() { } private void validateLength(String name) { - if (name.length() > 5) { + if (name.length() > MAX_INPUT_LENGTH) { throw new IllegalArgumentException("[ERROR] 이름의 길이는 5를 넘을수 없습니다."); } } From 45a256213b276fb24485b7aeb9f348408ffb1cc9 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Wed, 7 Apr 2021 10:27:03 +0900 Subject: [PATCH 20/34] =?UTF-8?q?refactor:Cars=20if=EB=AC=B8=20=EC=88=98?= =?UTF-8?q?=EC=A0=95?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/domain/Cars.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/8week/racingcar/src/main/java/domain/Cars.java b/8week/racingcar/src/main/java/domain/Cars.java index 08478ceb..079d17a0 100644 --- a/8week/racingcar/src/main/java/domain/Cars.java +++ b/8week/racingcar/src/main/java/domain/Cars.java @@ -18,7 +18,7 @@ private void validateCars(List cars) { .map(car -> car.getName()) .distinct() .count() != cars.size(); - if (value == true) { + if (value) { throw new IllegalArgumentException("[ERROR] 이름 중복"); } } From d5a6b7979a56abb8c42e99c30bf05fa38ad4db76 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Wed, 7 Apr 2021 10:29:58 +0900 Subject: [PATCH 21/34] =?UTF-8?q?refactor:Number=20=EB=B6=88=ED=95=84?= =?UTF-8?q?=EC=9A=94=ED=95=9C=20=EB=B3=80=EC=88=98=20=ED=95=A0=EB=8B=B9=20?= =?UTF-8?q?=EC=82=AD=EC=A0=9C?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/domain/Number.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/8week/racingcar/src/main/java/domain/Number.java b/8week/racingcar/src/main/java/domain/Number.java index be7eb58b..8e0f293d 100644 --- a/8week/racingcar/src/main/java/domain/Number.java +++ b/8week/racingcar/src/main/java/domain/Number.java @@ -10,7 +10,7 @@ public Number(String buffer) { private void validateNumber(String buffer) { try { - int value = Integer.parseInt(buffer); + Integer.parseInt(buffer); } catch (NumberFormatException e) { throw new IllegalArgumentException("[ERROR] 시도 횟수는 숫자여야 한다."); } From bf7ab0b89d2dc158daff881b47dcfccb8f4330d9 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Wed, 7 Apr 2021 10:33:40 +0900 Subject: [PATCH 22/34] =?UTF-8?q?refactor:RandomUtils=20=EC=BB=A8=EB=B2=A4?= =?UTF-8?q?=EC=85=98?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/utils/RandomUtils.java | 3 +++ 1 file changed, 3 insertions(+) diff --git a/8week/racingcar/src/main/java/utils/RandomUtils.java b/8week/racingcar/src/main/java/utils/RandomUtils.java index 7df94c32..ceff946b 100644 --- a/8week/racingcar/src/main/java/utils/RandomUtils.java +++ b/8week/racingcar/src/main/java/utils/RandomUtils.java @@ -4,8 +4,10 @@ public class RandomUtils { private static final Random RANDOM = new Random(); + private RandomUtils() { } + public static int randomIntGenerator(final int startNumber, final int lastNumber) { if (startNumber > lastNumber) { throw new IllegalArgumentException(); @@ -18,4 +20,5 @@ public static int randomIntGenerator(final int startNumber, final int lastNumber } return startNumber + RANDOM.nextInt(lastNumber - startNumber + 1); } + } From d498254cd8e674d784e52a6c6134dec4dcaa86fb Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Wed, 7 Apr 2021 10:37:36 +0900 Subject: [PATCH 23/34] =?UTF-8?q?refactor:Input=20spliterole=20=EC=83=81?= =?UTF-8?q?=EC=88=98=ED=99=94?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../src/main/java/service/RacingCarGameController.java | 2 +- 8week/racingcar/src/main/java/utils/Input.java | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/8week/racingcar/src/main/java/service/RacingCarGameController.java b/8week/racingcar/src/main/java/service/RacingCarGameController.java index c6db69dd..b600a3ca 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGameController.java +++ b/8week/racingcar/src/main/java/service/RacingCarGameController.java @@ -17,7 +17,7 @@ public Cars createCar() { String [] carNames = Input.stringInput(); return new Cars(Arrays.stream(carNames) .map(carName -> new Car(carName)) - .collect(Collectors.toCollection(ArrayList::new))); + .collect(Collectors.toList())); } public Number createCount() { diff --git a/8week/racingcar/src/main/java/utils/Input.java b/8week/racingcar/src/main/java/utils/Input.java index 95b7eff9..d2cfebcf 100644 --- a/8week/racingcar/src/main/java/utils/Input.java +++ b/8week/racingcar/src/main/java/utils/Input.java @@ -5,9 +5,9 @@ import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; -import java.util.Scanner; public class Input { + private static final String SPLIT_RULE = ","; private Input() {}; @@ -16,7 +16,7 @@ public static String[] stringInput() { System.out.println("경주할 자동차 이름을 입력하세요.(이름은 쉼표(,) 기준으로 구분)"); BufferedReader bf = new BufferedReader(new InputStreamReader(System.in)); String buffer = bf.readLine(); - return buffer.split(","); + return buffer.split(SPLIT_RULE); } catch (IOException e) { throw new IllegalArgumentException("[ERROR] 잘못된 입력입니다."); } From 7900eb3474626ce00a74c7a4d84c2667190e04b9 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Wed, 7 Apr 2021 10:45:56 +0900 Subject: [PATCH 24/34] =?UTF-8?q?refactor:Input=20BufferReader=20=EC=83=81?= =?UTF-8?q?=EC=88=98=ED=99=94?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/utils/Input.java | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/8week/racingcar/src/main/java/utils/Input.java b/8week/racingcar/src/main/java/utils/Input.java index d2cfebcf..6120442d 100644 --- a/8week/racingcar/src/main/java/utils/Input.java +++ b/8week/racingcar/src/main/java/utils/Input.java @@ -8,14 +8,14 @@ public class Input { private static final String SPLIT_RULE = ","; + private static final BufferedReader BUFFERED_READER = new BufferedReader(new InputStreamReader(System.in)); private Input() {}; public static String[] stringInput() { try { System.out.println("경주할 자동차 이름을 입력하세요.(이름은 쉼표(,) 기준으로 구분)"); - BufferedReader bf = new BufferedReader(new InputStreamReader(System.in)); - String buffer = bf.readLine(); + String buffer = BUFFERED_READER.readLine(); return buffer.split(SPLIT_RULE); } catch (IOException e) { throw new IllegalArgumentException("[ERROR] 잘못된 입력입니다."); @@ -25,8 +25,7 @@ public static String[] stringInput() { public static Number numberInput() { try { System.out.println("시도할 회수는 몇회인가요?"); - BufferedReader bf = new BufferedReader(new InputStreamReader(System.in)); - String buffer = bf.readLine(); + String buffer = BUFFERED_READER.readLine(); Number number = new Number(buffer); return number; } catch (IOException e) { From 73619f2335d6e3eec9f223c94b52f34c1ebc7508 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Wed, 7 Apr 2021 10:50:16 +0900 Subject: [PATCH 25/34] =?UTF-8?q?refactor:=EC=BD=94=EB=93=9C=20=EB=A7=88?= =?UTF-8?q?=EC=A7=80=EB=A7=89=EC=97=90=20=EB=B9=88=EC=A4=84=20=EC=B6=94?= =?UTF-8?q?=EA=B0=80?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/service/RacingCarGame.java | 2 +- .../src/main/java/service/RacingCarGameController.java | 7 ++++--- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/8week/racingcar/src/main/java/service/RacingCarGame.java b/8week/racingcar/src/main/java/service/RacingCarGame.java index 8a4965b8..458f4c28 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGame.java +++ b/8week/racingcar/src/main/java/service/RacingCarGame.java @@ -12,4 +12,4 @@ public void start() { controller.run(cars, count); } -} \ No newline at end of file +} diff --git a/8week/racingcar/src/main/java/service/RacingCarGameController.java b/8week/racingcar/src/main/java/service/RacingCarGameController.java index b600a3ca..c3776bf8 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGameController.java +++ b/8week/racingcar/src/main/java/service/RacingCarGameController.java @@ -14,7 +14,7 @@ public class RacingCarGameController { public Cars createCar() { - String [] carNames = Input.stringInput(); + String[] carNames = Input.stringInput(); return new Cars(Arrays.stream(carNames) .map(carName -> new Car(carName)) .collect(Collectors.toList())); @@ -26,13 +26,14 @@ public Number createCount() { public void run(Cars cars, Number count) { int times = count.getCount(); - while(times-- > 0) { + while (times-- > 0) { cars.moveCars(); cars.getCars().stream() - .forEach(Car->View.carStatusView(Car)); + .forEach(Car -> View.carStatusView(Car)); View.spacingWord(); } View.resultView(cars.getWinner()); } } + From 703c7f4cabd17f61b75aeb06d503cdb1d7ab2a9d Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Wed, 7 Apr 2021 10:52:43 +0900 Subject: [PATCH 26/34] =?UTF-8?q?refactor:findMaxPosition=20=EB=B6=88?= =?UTF-8?q?=ED=95=84=EC=9A=94=ED=95=9C=20=EB=B3=80=EC=88=98=20=ED=95=A0?= =?UTF-8?q?=EB=8B=B9=20=EC=82=AD=EC=A0=9C?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/domain/Cars.java | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/8week/racingcar/src/main/java/domain/Cars.java b/8week/racingcar/src/main/java/domain/Cars.java index 079d17a0..2e827a2a 100644 --- a/8week/racingcar/src/main/java/domain/Cars.java +++ b/8week/racingcar/src/main/java/domain/Cars.java @@ -33,11 +33,10 @@ public void moveCars() { } public int findMaxPosition() { - int maxPostion = cars.stream() + return cars.stream() .mapToInt(Car::getPosition) .max() .getAsInt(); - return maxPostion; } public List getWinner() { From c675eda5401408b7cbfe9a6b161f4322051df899 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Wed, 7 Apr 2021 10:58:45 +0900 Subject: [PATCH 27/34] refactor:MoveCars forEachOrderd -> forEach --- 8week/racingcar/src/main/java/domain/Cars.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/8week/racingcar/src/main/java/domain/Cars.java b/8week/racingcar/src/main/java/domain/Cars.java index 2e827a2a..11953727 100644 --- a/8week/racingcar/src/main/java/domain/Cars.java +++ b/8week/racingcar/src/main/java/domain/Cars.java @@ -29,7 +29,7 @@ public List getCars() { public void moveCars() { cars.stream() - .forEachOrdered(Car::movePosition); + .forEach(Car::movePosition); } public int findMaxPosition() { From 4a38043cfac18b8204d48b7d1fda9a3e15c5f536 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Wed, 7 Apr 2021 11:12:44 +0900 Subject: [PATCH 28/34] =?UTF-8?q?refactor:buffer=20=EB=84=A4=EC=9D=B4?= =?UTF-8?q?=EB=B0=8D=20=EC=88=98=EC=A0=95?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/domain/Number.java | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/8week/racingcar/src/main/java/domain/Number.java b/8week/racingcar/src/main/java/domain/Number.java index 8e0f293d..320a6f39 100644 --- a/8week/racingcar/src/main/java/domain/Number.java +++ b/8week/racingcar/src/main/java/domain/Number.java @@ -3,14 +3,14 @@ public class Number { private final int value; - public Number(String buffer) { - validateNumber(buffer); - this.value = Integer.parseInt(buffer); + public Number(String value) { + validateNumber(value); + this.value = Integer.parseInt(value); } - private void validateNumber(String buffer) { + private void validateNumber(String value) { try { - Integer.parseInt(buffer); + Integer.parseInt(value); } catch (NumberFormatException e) { throw new IllegalArgumentException("[ERROR] 시도 횟수는 숫자여야 한다."); } From e8a53fd4d32d48e014b8071c448ddecf8634486a Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Wed, 7 Apr 2021 12:10:05 +0900 Subject: [PATCH 29/34] =?UTF-8?q?refactor:Cars=20=EC=83=9D=EC=84=B1?= =?UTF-8?q?=EC=9E=90=20=EC=88=98=EC=A0=95?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/domain/Cars.java | 15 ++++++++------- .../java/service/RacingCarGameController.java | 7 +++---- 8week/racingcar/src/main/java/utils/Input.java | 6 ++++-- 3 files changed, 15 insertions(+), 13 deletions(-) diff --git a/8week/racingcar/src/main/java/domain/Cars.java b/8week/racingcar/src/main/java/domain/Cars.java index 11953727..0668f442 100644 --- a/8week/racingcar/src/main/java/domain/Cars.java +++ b/8week/racingcar/src/main/java/domain/Cars.java @@ -8,16 +8,17 @@ public class Cars { private final List cars; - public Cars (List cars) { - validateCars(cars); - this.cars = new ArrayList<>(cars); + public Cars (List carNames) { + validateCars(carNames); + this.cars = carNames.stream() + .map(carName->new Car(carName)) + .collect(Collectors.toList()); } - private void validateCars(List cars) { - Boolean value = (int) cars.stream() - .map(car -> car.getName()) + private void validateCars(List carNames) { + Boolean value = (int) carNames.stream() .distinct() - .count() != cars.size(); + .count() != carNames.size(); if (value) { throw new IllegalArgumentException("[ERROR] 이름 중복"); } diff --git a/8week/racingcar/src/main/java/service/RacingCarGameController.java b/8week/racingcar/src/main/java/service/RacingCarGameController.java index c3776bf8..d9335aaf 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGameController.java +++ b/8week/racingcar/src/main/java/service/RacingCarGameController.java @@ -9,15 +9,14 @@ import java.util.ArrayList; import java.util.Arrays; +import java.util.List; import java.util.stream.Collectors; public class RacingCarGameController { public Cars createCar() { - String[] carNames = Input.stringInput(); - return new Cars(Arrays.stream(carNames) - .map(carName -> new Car(carName)) - .collect(Collectors.toList())); + List carNames = Input.stringInput(); + return new Cars(carNames); } public Number createCount() { diff --git a/8week/racingcar/src/main/java/utils/Input.java b/8week/racingcar/src/main/java/utils/Input.java index 6120442d..3aa3d68c 100644 --- a/8week/racingcar/src/main/java/utils/Input.java +++ b/8week/racingcar/src/main/java/utils/Input.java @@ -5,6 +5,8 @@ import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; +import java.util.Arrays; +import java.util.List; public class Input { private static final String SPLIT_RULE = ","; @@ -12,11 +14,11 @@ public class Input { private Input() {}; - public static String[] stringInput() { + public static List stringInput() { try { System.out.println("경주할 자동차 이름을 입력하세요.(이름은 쉼표(,) 기준으로 구분)"); String buffer = BUFFERED_READER.readLine(); - return buffer.split(SPLIT_RULE); + return Arrays.asList(buffer.split(SPLIT_RULE)); } catch (IOException e) { throw new IllegalArgumentException("[ERROR] 잘못된 입력입니다."); } From e5ed149cbe47bc83672c42bc9be200ae182a350d Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Wed, 7 Apr 2021 12:25:41 +0900 Subject: [PATCH 30/34] =?UTF-8?q?refactor:Winner=20=EC=88=98=EC=A0=95?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/domain/Car.java | 13 ++++++++++++- 8week/racingcar/src/main/java/domain/Cars.java | 10 +++++----- 2 files changed, 17 insertions(+), 6 deletions(-) diff --git a/8week/racingcar/src/main/java/domain/Car.java b/8week/racingcar/src/main/java/domain/Car.java index 223730e5..21dea0ca 100644 --- a/8week/racingcar/src/main/java/domain/Car.java +++ b/8week/racingcar/src/main/java/domain/Car.java @@ -2,7 +2,9 @@ import utils.RandomUtils; -public class Car { +import java.util.Comparator; + +public class Car implements Comparable { private final String name; private int position; private static final int START_NUMBER = 0; @@ -42,4 +44,13 @@ public static void validateInput(String buffer) { throw new IllegalArgumentException("[ERROR] 잘못된 입력입니다."); } } + + public boolean isSamePosition(Car other) { + return other.position == this.position; + } + + @Override + public int compareTo(Car other) { + return this.position - other.position; + } } diff --git a/8week/racingcar/src/main/java/domain/Cars.java b/8week/racingcar/src/main/java/domain/Cars.java index 0668f442..e2823b94 100644 --- a/8week/racingcar/src/main/java/domain/Cars.java +++ b/8week/racingcar/src/main/java/domain/Cars.java @@ -3,6 +3,7 @@ import java.util.ArrayList; import java.util.Collections; import java.util.List; +import java.util.Optional; import java.util.stream.Collectors; public class Cars { @@ -33,16 +34,15 @@ public void moveCars() { .forEach(Car::movePosition); } - public int findMaxPosition() { + private Car findMaxPosition() { return cars.stream() - .mapToInt(Car::getPosition) - .max() - .getAsInt(); + .max(Car::compareTo) + .orElseThrow(() -> new IllegalArgumentException("[ERROR] 차량 리스트가 비었습니다.")); } public List getWinner() { return cars.stream() - .filter(car -> car.getPosition() == findMaxPosition()) + .filter(car -> car.isSamePosition(findMaxPosition())) .collect(Collectors.toCollection(ArrayList::new)); } } From eb1444ad79d7a7144693204b08e27c3380703be1 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Thu, 8 Apr 2021 12:42:47 +0900 Subject: [PATCH 31/34] =?UTF-8?q?refactor:View=20=EB=AC=B8=EC=9E=90=20?= =?UTF-8?q?=EC=83=81=EC=88=98=ED=99=94?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/domain/Car.java | 9 ++++++--- 8week/racingcar/src/main/java/domain/Cars.java | 2 +- 8week/racingcar/src/main/java/utils/View.java | 16 ++++++++++------ 3 files changed, 17 insertions(+), 10 deletions(-) diff --git a/8week/racingcar/src/main/java/domain/Car.java b/8week/racingcar/src/main/java/domain/Car.java index 21dea0ca..79653fea 100644 --- a/8week/racingcar/src/main/java/domain/Car.java +++ b/8week/racingcar/src/main/java/domain/Car.java @@ -2,8 +2,6 @@ import utils.RandomUtils; -import java.util.Comparator; - public class Car implements Comparable { private final String name; private int position; @@ -20,11 +18,15 @@ public Car(final String name) { } public void movePosition() { - if (RandomUtils.randomIntGenerator(START_NUMBER, FINISH_NUMBER) > CONTROL_POINT) { + if (isMoveAble(RandomUtils.randomIntGenerator(START_NUMBER, FINISH_NUMBER))) { this.position = position + 1; } } + private boolean isMoveAble(int randomValue) { + return randomValue > CONTROL_POINT; + } + private void validateLength(String name) { if (name.length() > MAX_INPUT_LENGTH) { throw new IllegalArgumentException("[ERROR] 이름의 길이는 5를 넘을수 없습니다."); @@ -53,4 +55,5 @@ public boolean isSamePosition(Car other) { public int compareTo(Car other) { return this.position - other.position; } + } diff --git a/8week/racingcar/src/main/java/domain/Cars.java b/8week/racingcar/src/main/java/domain/Cars.java index e2823b94..b1d3285c 100644 --- a/8week/racingcar/src/main/java/domain/Cars.java +++ b/8week/racingcar/src/main/java/domain/Cars.java @@ -3,9 +3,9 @@ import java.util.ArrayList; import java.util.Collections; import java.util.List; -import java.util.Optional; import java.util.stream.Collectors; + public class Cars { private final List cars; diff --git a/8week/racingcar/src/main/java/utils/View.java b/8week/racingcar/src/main/java/utils/View.java index fc0d4899..1b03515b 100644 --- a/8week/racingcar/src/main/java/utils/View.java +++ b/8week/racingcar/src/main/java/utils/View.java @@ -6,25 +6,29 @@ import java.util.stream.Collectors; public class View { + private static final String FINAL_WINNER = "최종 우승자 : "; + private static final String COLON = " : "; + private static final String COMMA = ", "; + private static final String POSITION_VIEW = "-"; private View() {}; - public static void distanceView(final int positon) { - for (int count = 0; count < positon; count ++) { - System.out.print("-"); + public static void distanceView(final int position) { + for (int count = 0; count < position; count ++) { + System.out.print(POSITION_VIEW); } System.out.println(); } public static void carNameView(final String name){ - System.out.print(name + " : "); + System.out.print(name + COLON); } public static void resultView(final List cars){ - System.out.print("최종 우승자 : "); + System.out.print(FINAL_WINNER); String winner = cars.stream() .map(Car::getName) - .collect(Collectors.joining(", ")); + .collect(Collectors.joining(COMMA)); System.out.println(winner); } From d0a0667f1bf6dc051220532767b4cf4282d8b038 Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Tue, 13 Apr 2021 14:07:42 +0900 Subject: [PATCH 32/34] =?UTF-8?q?refactor:moveCar=20=EB=9E=9C=EB=8D=A4?= =?UTF-8?q?=EA=B0=92=20=ED=8C=8C=EB=9D=BC=EB=AF=B8=ED=84=B0=EB=A1=9C=20?= =?UTF-8?q?=EB=84=98=EA=B2=A8=EC=A3=BC=EA=B8=B0,=20=EC=9D=B8=EB=8D=B4?= =?UTF-8?q?=ED=8A=B8=20=EC=88=98=EC=A0=95?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/domain/Car.java | 9 +++------ .../racingcar/src/main/java/domain/Cars.java | 6 +++++- .../src/main/java/domain/Number.java | 1 - .../src/main/java/service/RacingCarGame.java | 2 -- .../java/service/RacingCarGameController.java | 2 -- .../racingcar/src/main/java/utils/Input.java | 1 - 8week/racingcar/src/test/java/StreamTest.java | 19 +++++++++++++++++++ 7 files changed, 27 insertions(+), 13 deletions(-) create mode 100644 8week/racingcar/src/test/java/StreamTest.java diff --git a/8week/racingcar/src/main/java/domain/Car.java b/8week/racingcar/src/main/java/domain/Car.java index 79653fea..34990757 100644 --- a/8week/racingcar/src/main/java/domain/Car.java +++ b/8week/racingcar/src/main/java/domain/Car.java @@ -5,8 +5,6 @@ public class Car implements Comparable { private final String name; private int position; - private static final int START_NUMBER = 0; - private static final int FINISH_NUMBER = 10; private static final int CONTROL_POINT = 4; private static final int MAX_INPUT_LENGTH = 5; @@ -17,8 +15,8 @@ public Car(final String name) { this.position = 0; } - public void movePosition() { - if (isMoveAble(RandomUtils.randomIntGenerator(START_NUMBER, FINISH_NUMBER))) { + public void movePosition(int randomValue) { + if (isMoveAble(randomValue)) { this.position = position + 1; } } @@ -41,7 +39,7 @@ public String getName() { return name; } - public static void validateInput(String buffer) { + private void validateInput(String buffer) { if (buffer.contains(" ")) { throw new IllegalArgumentException("[ERROR] 잘못된 입력입니다."); } @@ -55,5 +53,4 @@ public boolean isSamePosition(Car other) { public int compareTo(Car other) { return this.position - other.position; } - } diff --git a/8week/racingcar/src/main/java/domain/Cars.java b/8week/racingcar/src/main/java/domain/Cars.java index b1d3285c..48937677 100644 --- a/8week/racingcar/src/main/java/domain/Cars.java +++ b/8week/racingcar/src/main/java/domain/Cars.java @@ -1,5 +1,7 @@ package domain; +import utils.RandomUtils; + import java.util.ArrayList; import java.util.Collections; import java.util.List; @@ -8,6 +10,8 @@ public class Cars { private final List cars; + private static final int START_NUMBER = 0; + private static final int FINISH_NUMBER = 10; public Cars (List carNames) { validateCars(carNames); @@ -31,7 +35,7 @@ public List getCars() { public void moveCars() { cars.stream() - .forEach(Car::movePosition); + .forEach(Car-> Car.movePosition(RandomUtils.randomIntGenerator(START_NUMBER, FINISH_NUMBER))); } private Car findMaxPosition() { diff --git a/8week/racingcar/src/main/java/domain/Number.java b/8week/racingcar/src/main/java/domain/Number.java index 320a6f39..4c87be0d 100644 --- a/8week/racingcar/src/main/java/domain/Number.java +++ b/8week/racingcar/src/main/java/domain/Number.java @@ -19,5 +19,4 @@ private void validateNumber(String value) { public int getCount() { return value; } - } diff --git a/8week/racingcar/src/main/java/service/RacingCarGame.java b/8week/racingcar/src/main/java/service/RacingCarGame.java index 458f4c28..03fc4ef4 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGame.java +++ b/8week/racingcar/src/main/java/service/RacingCarGame.java @@ -4,12 +4,10 @@ import domain.Number; public class RacingCarGame { - public void start() { RacingCarGameController controller = new RacingCarGameController(); Cars cars = controller.createCar(); Number count = controller.createCount(); controller.run(cars, count); } - } diff --git a/8week/racingcar/src/main/java/service/RacingCarGameController.java b/8week/racingcar/src/main/java/service/RacingCarGameController.java index d9335aaf..c2c47c0f 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGameController.java +++ b/8week/racingcar/src/main/java/service/RacingCarGameController.java @@ -13,7 +13,6 @@ import java.util.stream.Collectors; public class RacingCarGameController { - public Cars createCar() { List carNames = Input.stringInput(); return new Cars(carNames); @@ -33,6 +32,5 @@ public void run(Cars cars, Number count) { } View.resultView(cars.getWinner()); } - } diff --git a/8week/racingcar/src/main/java/utils/Input.java b/8week/racingcar/src/main/java/utils/Input.java index 3aa3d68c..0c3bd4b3 100644 --- a/8week/racingcar/src/main/java/utils/Input.java +++ b/8week/racingcar/src/main/java/utils/Input.java @@ -34,5 +34,4 @@ public static Number numberInput() { throw new IllegalArgumentException("[ERROR] 잘못된 입력입니다."); } } - } diff --git a/8week/racingcar/src/test/java/StreamTest.java b/8week/racingcar/src/test/java/StreamTest.java new file mode 100644 index 00000000..61e36dcf --- /dev/null +++ b/8week/racingcar/src/test/java/StreamTest.java @@ -0,0 +1,19 @@ +import org.junit.Test; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.List; +import java.util.stream.Collectors; + +public class StreamTest { + @Test + public void 테스트() { + List name = new ArrayList<>(Arrays.asList("동현", "정윤", "태정", "문기", "윤지", "수연")); + List collects = name.stream() + .sorted() + .collect(Collectors.toList()); + for(String collect : collects) { + System.out.println(collect); + } + } +} From 3557aff58b5a77b10ee24d2c72cbfc660b535c4b Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Tue, 27 Apr 2021 13:12:34 +0900 Subject: [PATCH 33/34] =?UTF-8?q?refactor=20:=20run=20=EB=A9=94=EC=86=8C?= =?UTF-8?q?=EB=93=9C=20=EC=88=98=EC=A0=95?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 8week/racingcar/src/main/java/Application.java | 5 ++--- 8week/racingcar/src/main/java/domain/Car.java | 2 -- .../src/main/java/service/RacingCarGame.java | 13 ------------- .../src/main/java/service/RacingGame.java | 8 ++++++++ ...eController.java => RacingGameController.java} | 15 ++++++--------- 5 files changed, 16 insertions(+), 27 deletions(-) delete mode 100644 8week/racingcar/src/main/java/service/RacingCarGame.java create mode 100644 8week/racingcar/src/main/java/service/RacingGame.java rename 8week/racingcar/src/main/java/service/{RacingCarGameController.java => RacingGameController.java} (68%) diff --git a/8week/racingcar/src/main/java/Application.java b/8week/racingcar/src/main/java/Application.java index 000ccf79..e4975541 100644 --- a/8week/racingcar/src/main/java/Application.java +++ b/8week/racingcar/src/main/java/Application.java @@ -1,8 +1,7 @@ -import service.RacingCarGame; +import service.RacingGame; public class Application { public static void main(String[] args) { - RacingCarGame racingCarGame = new RacingCarGame(); - racingCarGame.start(); + RacingGame.start(); } } diff --git a/8week/racingcar/src/main/java/domain/Car.java b/8week/racingcar/src/main/java/domain/Car.java index 34990757..41328194 100644 --- a/8week/racingcar/src/main/java/domain/Car.java +++ b/8week/racingcar/src/main/java/domain/Car.java @@ -1,7 +1,5 @@ package domain; -import utils.RandomUtils; - public class Car implements Comparable { private final String name; private int position; diff --git a/8week/racingcar/src/main/java/service/RacingCarGame.java b/8week/racingcar/src/main/java/service/RacingCarGame.java deleted file mode 100644 index 03fc4ef4..00000000 --- a/8week/racingcar/src/main/java/service/RacingCarGame.java +++ /dev/null @@ -1,13 +0,0 @@ -package service; - -import domain.Cars; -import domain.Number; - -public class RacingCarGame { - public void start() { - RacingCarGameController controller = new RacingCarGameController(); - Cars cars = controller.createCar(); - Number count = controller.createCount(); - controller.run(cars, count); - } -} diff --git a/8week/racingcar/src/main/java/service/RacingGame.java b/8week/racingcar/src/main/java/service/RacingGame.java new file mode 100644 index 00000000..a11c1388 --- /dev/null +++ b/8week/racingcar/src/main/java/service/RacingGame.java @@ -0,0 +1,8 @@ +package service; + +public class RacingGame { + public static void start() { + RacingGameController controller = new RacingGameController(); + controller.run(); + } +} diff --git a/8week/racingcar/src/main/java/service/RacingCarGameController.java b/8week/racingcar/src/main/java/service/RacingGameController.java similarity index 68% rename from 8week/racingcar/src/main/java/service/RacingCarGameController.java rename to 8week/racingcar/src/main/java/service/RacingGameController.java index c2c47c0f..f12f5c0e 100644 --- a/8week/racingcar/src/main/java/service/RacingCarGameController.java +++ b/8week/racingcar/src/main/java/service/RacingGameController.java @@ -1,28 +1,25 @@ package service; -import domain.Car; import domain.Cars; import domain.Number; import utils.Input; import utils.View; - -import java.util.ArrayList; -import java.util.Arrays; import java.util.List; -import java.util.stream.Collectors; -public class RacingCarGameController { - public Cars createCar() { +public class RacingGameController { + private Cars createCar() { List carNames = Input.stringInput(); return new Cars(carNames); } - public Number createCount() { + private Number createCount() { return Input.numberInput(); } - public void run(Cars cars, Number count) { + public void run() { + Cars cars = createCar(); + Number count = createCount(); int times = count.getCount(); while (times-- > 0) { cars.moveCars(); From 3c73adc5732ea5cf1f3c958f31bba82ae05d89fd Mon Sep 17 00:00:00 2001 From: DongLee99 Date: Fri, 30 Apr 2021 21:09:13 +0900 Subject: [PATCH 34/34] refactor: for -> stream --- 8week/racingcar/src/main/java/utils/View.java | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/8week/racingcar/src/main/java/utils/View.java b/8week/racingcar/src/main/java/utils/View.java index 1b03515b..c708060f 100644 --- a/8week/racingcar/src/main/java/utils/View.java +++ b/8week/racingcar/src/main/java/utils/View.java @@ -13,8 +13,8 @@ public class View { private View() {}; - public static void distanceView(final int position) { - for (int count = 0; count < position; count ++) { + public static void distanceView(int position) { + while (position-- > 0){ System.out.print(POSITION_VIEW); } System.out.println();