diff --git a/BubbleSort.java b/BubbleSort.java
new file mode 100644
index 0000000..888e51e
--- /dev/null
+++ b/BubbleSort.java
@@ -0,0 +1,29 @@
+public class BubbleSort {
+ public static void main(String[] args) {
+
+ 	int[] input = new int[6];
+ 	int jawaban=1;
+
+ 	for(int a=0;a<args.length;a++){
+ 		input[a] = Integer.parseInt(args[a]);
+ 	}
+
+ 	for(int b=0;b<input.length;b++)
+ 	{
+ 		for(int c=0;c<input.length;c++)
+ 		{
+ 			if(input[b]<input[c])
+ 			{
+ 				int temp = input[c];
+ 				input[c]=input[b];
+ 				input[b]=temp;
+ 			}
+ 		}
+ 	}
+
+ 	for(int a=0;a<input.length;a++)
+ 		System.out.println(input[a]+ " ");
+ }
+
+}
+
diff --git a/HelloWorld.java b/HelloWorld.java
new file mode 100644
index 0000000..ef1f9b6
--- /dev/null
+++ b/HelloWorld.java
@@ -0,0 +1,8 @@
+public class HelloWorld {
+ public static void main(String[] args) {
+	System.out.println("Hello World");
+	
+
+}
+}
+
diff --git a/IterationFor.java b/IterationFor.java
new file mode 100644
index 0000000..d6dd03a
--- /dev/null
+++ b/IterationFor.java
@@ -0,0 +1,13 @@
+public class IterationFor {
+ public static void main(String[] args) {
+
+ 	int input=Integer.parseInt(args[0]);
+ 	int jawaban=1;
+
+ 	for(int i=input;i>1;i--){
+ 		jawaban=jawaban*i;
+ 	}
+ 	System.out.println(jawaban);
+}
+}
+
diff --git a/JumlahHari.java b/JumlahHari.java
new file mode 100644
index 0000000..458abf2
--- /dev/null
+++ b/JumlahHari.java
@@ -0,0 +1,63 @@
+public class JumlahHari {
+ public static void main(String[] args) {
+
+ 	if(args.length<2){
+ 		System.out.println("Usage: Calender<MonthNumber Year>");
+ 	}
+
+ 	int bulan= Integer.parseInt(args[0]);
+ 	int tahun= Integer.parseInt(args[1]);
+ 	int hari=1;
+
+ 	switch(bulan){
+ 		case 1:
+			hari=31;		
+ 			break;
+  		case 2:
+  			{
+  				if(tahun%4==0){
+					hari=29; 		
+  				}
+  				else
+  				{
+  					hari=28;	
+  				}
+  			}
+ 			break;
+  		case 3:
+			hari=31; 		
+ 			break;
+ 		case 4:
+ 			hari=30;
+ 			break;
+ 		case 5:
+ 			hari=31;
+ 			break;
+ 		case 6:
+ 			hari=30;
+ 			break;
+ 		case 7:
+ 			hari=31;
+ 			break;
+ 		case 8:
+ 			hari=31;
+ 			break;
+ 		case 9:
+ 			hari=30;
+ 			break;
+ 		case 10:
+ 			hari=31;
+ 			break;
+ 		case 11:
+ 			hari=30;
+ 			break;
+ 		case 12:
+ 			hari=31;
+ 			break;
+ 	}
+
+ 	System.out.println("Jumlah hari dalam bulan tersebut adalah " + hari);
+
+}
+}
+
diff --git a/LetterGrade.java b/LetterGrade.java
new file mode 100644
index 0000000..3a7f766
--- /dev/null
+++ b/LetterGrade.java
@@ -0,0 +1,25 @@
+public class LetterGrade {
+ public static void main(String[] args) {
+	// System.out.println("Hello World");
+
+
+	int score = Integer.parseInt(args[0]);
+	if(score>=80){
+		System.out.println("A");
+	}
+	else if(score>=60)
+	{
+		System.out.println("B");
+	}
+	else if(score>=40){
+		System.out.println("C");
+	}
+	else if(score>=20){
+		System.out.println("D");
+	}
+	else{
+		System.out.println("E");
+	}
+}
+}
+
diff --git a/Recursive.java b/Recursive.java
new file mode 100644
index 0000000..b9bb2dc
--- /dev/null
+++ b/Recursive.java
@@ -0,0 +1,19 @@
+public class Recursive {
+ public static void main(String[] args) {
+
+ 	int input=Integer.parseInt(args[0]);
+ 	int jawaban=1;
+
+ 	jawaban=factorial(input);
+
+ 	System.out.println(jawaban);
+}
+
+public static int factorial(int n){
+	if(n==1) return 1;
+	int jawab=n*(factorial(n-1));
+
+	return jawab;
+}
+}
+
diff --git a/SwitchCase.java b/SwitchCase.java
new file mode 100644
index 0000000..3ec969c
--- /dev/null
+++ b/SwitchCase.java
@@ -0,0 +1,53 @@
+public class SwitchCase {
+ public static void main(String[] args) {
+
+ 	if(args.length!=1){
+ 		System.out.println("Usage: Calender<MonthNumber>");
+ 	}
+
+ 	int bulan= Integer.parseInt(args[0]);
+
+ 	switch(bulan){
+ 		case 1:
+			System.out.println("Januari"); 		
+ 			break;
+  		case 2:
+			System.out.println("Februari"); 		
+ 			break;
+  		case 3:
+			System.out.println("Maret"); 		
+ 			break;
+ 		case 4:
+ 			System.out.println("April");
+ 			break;
+ 		case 5:
+ 			System.out.println("Mei");
+ 			break;
+ 		case 6:
+ 			System.out.println("Juni");
+ 			break;
+ 		case 7:
+ 			System.out.println("Juli");
+ 			break;
+ 		case 8:
+ 			System.out.println("Agustus");
+ 			break;
+ 		case 9:
+ 			System.out.println("September");
+ 			break;
+ 		case 10:
+ 			System.out.println("Oktober");
+ 			break;
+ 		case 11:
+ 			System.out.println("November");
+ 			break;
+ 		case 12:
+ 			System.out.println("Desember");
+ 			break;
+
+
+ 	}
+
+}
+}
+