Session 1

BubbleSort.java

@@ -0,0 +1,43 @@
+public class BubbleSort {
+	public BubbleSort(Integer count, Integer[] passedArray){
+		for(int i = 0; i < count; i++){
+			for(int j = 0; j < i; j++){
+				if(passedArray[i] <= passedArray[j]){
+					////Swapping using multiplication/division - buggy when any item(s) is/are 0
+					//passedArray[i] = passedArray[i] * passedArray[j];
+					//passedArray[j] = passedArray[i] / passedArray[j];
+					//passedArray[i] = passedArray[i] / passedArray[j];
+
+					////Swapping using XOR
+					//passedArray[i] = passedArray[i] ^ passedArray[j];
+					//passedArray[j] = passedArray[i] ^ passedArray[j];
+					//passedArray[i] = passedArray[i] ^ passedArray[j];
+
+					//Swapping using addition/substraction
+					passedArray[i] = passedArray[i] + passedArray[j];
+					passedArray[j] = passedArray[i] - passedArray[j];
+					passedArray[i] = passedArray[i] - passedArray[j];
+				}
+			}
+		}
+
+		for(int i = 0; i < count; i++){
+			System.out.println(passedArray[i]);
+		}
+	}
+
+	public static void main(String[] args){
+		Integer numberOfItems = args.length;
+		Integer[] inputsToBeSorted = new Integer[numberOfItems];
+
+		for(int i = 0; i < numberOfItems; i++){
+			inputsToBeSorted[i] = Integer.parseInt(args[i]);
+		}
+
+		try {
+			new BubbleSort(numberOfItems, inputsToBeSorted);
+		} catch (Exception e) {
+			System.out.println("Empty argument!");
+		}
+	}
+}

CollectionsTest.java

@@ -0,0 +1,37 @@
+import java.util.*;
+
+public class CollectionsTest {
+	public static void main(String[] args){
+		//ArrayList
+		List<String> names = new ArrayList<>();
+		names.add("ABC");
+		names.add("Budi");
+		names.add("Andy");
+		names.add(null);
+		//names.add(stringSet);	//Compile error due to different object type
+
+		for(String name : names){
+			System.out.println(name);
+		}
+
+		//Set
+		Set<String> stringSet = new HashSet<>();
+		stringSet.add("String 1");
+		stringSet.add("String 1");
+		stringSet.add("String 2");
+		stringSet.add(null);
+		//stringSet.add(names);	//Compile error due to different object type
+		for(String str : stringSet){
+			System.out.println(str);
+		}
+
+		//Map
+		Map<String, Integer> scoreByName  = new HashMap<>();
+		scoreByName.put("Oliver", 100);
+		scoreByName.put(null, 19);
+		//scoreByName.put(names, 21);	//Compile error due to different object type
+		for (Map.Entry<String, Integer> entry : scoreByName.entrySet()){	//Prints from last item
+			System.out.println(entry.getKey() + ": " + entry.getValue());
+		}
+	}
+}

DayPrinter.java

@@ -0,0 +1,38 @@
+public class DayPrinter {
+	public DayPrinter(Integer year, Integer month){
+		switch(month){
+			case 1:
+			case 3:
+			case 5:
+			case 7:
+			case 8:
+			case 10:
+			case 12:
+				System.out.println("31");
+				break;
+			case 4:
+			case 6:
+			case 9:
+			case 11:
+				System.out.println("30");
+				break;
+			case 2:
+				if(year % 4 == 0){
+					System.out.println("29");
+				} else {
+					System.out.println("28");
+				}
+				break;
+			default:
+				System.out.println("Invalid input!");
+		}
+	}
+
+	public static void main(String[] args){
+		try{
+			new DayPrinter(Integer.parseInt(args[0]), Integer.parseInt(args[1]));
+		} catch (Exception e){
+			System.out.println("Empty argument!");
+		}
+	}
+}

FactorialLooping.java

@@ -0,0 +1,19 @@
+public class FactorialLooping {
+	public FactorialLooping(Integer number){
+		Integer result = 1;
+
+		for(int i = 1; i <= number; i++){
+			result = result * i;
+		}
+
+		System.out.println(result);
+	}
+
+	public static void main(String[] args){
+		try{
+			new FactorialLooping(Integer.parseInt(args[0]));
+		} catch(Exception e){
+			System.out.println("Empty argument");
+		}
+	}
+}

FactorialRecursive.java

@@ -0,0 +1,22 @@
+public class FactorialRecursive {
+	private Integer recursive(Integer number){
+		if(number > 0){
+			return number * recursive(number - 1);
+		}
+		return 1;
+	}
+
+	public FactorialRecursive(Integer number){
+		Integer result = recursive(number);
+
+		System.out.println(result);
+	}
+
+	public static void main(String[] args){
+		try{
+			new FactorialRecursive(Integer.parseInt(args[0]));
+		} catch (Exception e){
+			System.out.println("Empty argument!");
+		}
+	}
+}

MonthNamePrinter.java

@@ -0,0 +1,53 @@
+public class MonthNamePrinter {
+	public MonthNamePrinter(Integer monthNumber){
+		switch(monthNumber){
+			case 1:
+				System.out.println("January");
+				break;
+			case 2:
+				System.out.println("February");
+				break;
+			case 3:
+				System.out.println("March");
+				break;
+			case 4:
+				System.out.println("April");
+				break;
+			case 5:
+				System.out.println("May");
+				break;
+			case 6:
+				System.out.println("June");
+				break;
+			case 7:
+				System.out.println("July");
+				break;
+			case 8:
+				System.out.println("August");
+				break;
+			case 9:
+				System.out.println("September");
+				break;
+			case 10:
+				System.out.println("October");
+				break;
+			case 11:
+				System.out.println("November");
+				break;
+			case 12:
+				System.out.println("December");
+				break;
+			default:
+				System.out.println("Input invalid!");
+				break;
+		}
+	}
+
+	public static void main(String[] args){
+		try{
+			new MonthNamePrinter(Integer.parseInt(args[0]));
+		} catch(Exception e){
+			System.out.println("Empty argument!");
+		}
+	}
+}

ScoreGradePrinter.java

@@ -0,0 +1,29 @@
+public class ScoreGradePrinter {
+	public ScoreGradePrinter(Integer score){
+		System.out.print("Your grade: ");
+		if(score >= 0 && score <= 20){
+			System.out.println("E");
+			System.out.println("You Have to Study Extra Extra Hard!");
+		} else if(score > 20 && score <= 40){
+			System.out.println("D");
+			System.out.println("You Have to Study Extra Hard!");
+		} else if(score > 40 && score <= 60){
+			System.out.println("C");
+			System.out.println("You Have to Study Hard!");
+		} else if(score > 60 && score <= 80){
+			System.out.println("B");
+			System.out.println("You Have to Study Harder!");
+		} else if(score > 80 && score <= 100){
+			System.out.println("A");
+			System.out.println("You Have to Maintain Your Performance!");
+		}
+	}
+
+	public static void main(String[] args){
+		try{
+			new ScoreGradePrinter(Integer.parseInt(args[0]));
+		} catch(Exception e){
+			System.out.println("Empty argument!");
+		}
+	}
+}