diff --git a/bubblesort.java b/bubblesort.java
new file mode 100644
index 0000000..41ab04b
--- /dev/null
+++ b/bubblesort.java
@@ -0,0 +1,42 @@
+public class bubblesort{
+	public static void main(String[] args){
+		if(args.length<1){
+			System.err.println("Usage: bubblesort < isi array >");
+			return ;
+		}
+		
+		int[] arrayInteger = new int[args.length];
+		
+		System.out.println("Before Sorting: ");
+		
+		//print all before
+		for(int i=0; i < arrayInteger.length; i++){
+			arrayInteger[i]=Integer.parseInt(args[i]);
+			System.out.print(arrayInteger[i] + " ");
+			
+		}
+		
+		//sorting function
+		int n=args.length ;
+		int temp=0;
+		for(int i=0;i<n;i++){
+			for(int j=1;j<(n-i);j++){
+				if(arrayInteger[j-1]>arrayInteger[j]){
+					//swap elements
+					temp=arrayInteger[j-1];
+					arrayInteger[j-1]=arrayInteger[j];
+					arrayInteger[j]= temp;
+					}
+				}
+			}
+		
+		
+		System.out.println("\n\nAfter Sorting: ");
+		//print all after 
+		for(int i=0; i<arrayInteger.length; i++){
+			System.out.print(arrayInteger[i] + " ");
+		}		
+		
+		
+	}
+}
diff --git a/bulan.java b/bulan.java
new file mode 100644
index 0000000..c1b1240
--- /dev/null
+++ b/bulan.java
@@ -0,0 +1,50 @@
+public class bulan{
+	public static void main(String[] args){
+		if(args.length!=1){
+			System.err.println("Usage: bulan <nomorbulan>");
+			return;
+		}
+		int month = Integer.parseInt(args[0]);
+		switch(month){
+			case 1:
+				System.out.println("Januari");
+				break;
+			case 2 :
+				System.out.println("Febuari");
+				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;	
+			default :
+				System.out.println(
+				"bukan bulan");
+		}
+	}	
+}
\ No newline at end of file
diff --git a/faktorial.java b/faktorial.java
new file mode 100644
index 0000000..3b262ed
--- /dev/null
+++ b/faktorial.java
@@ -0,0 +1,19 @@
+public class faktorial{
+	public static void main(String[] args){
+		if(args.length!=1){
+			System.err.println("Usage: faktorial <angka>");
+			return;
+		}	
+		int angka= Integer.parseInt(args[0]);
+		int faktorial=1;
+		for(int i =angka ; i>=1 ; i--){
+			System.out.print(i+ " "+"\n");
+			 faktorial = faktorial * i;
+		}
+		
+		System.out.println(angka+"! = "+faktorial);
+	
+		
+		
+	}
+}
\ No newline at end of file
diff --git a/jlh_hari.java b/jlh_hari.java
new file mode 100644
index 0000000..7d4cbfc
--- /dev/null
+++ b/jlh_hari.java
@@ -0,0 +1,41 @@
+public class jlh_hari{
+	public static void main(String[] args){
+		if(args.length!=2){
+			System.err.println("Usage: jlh_hari <bulan> <tahun>");
+			return;
+		}	
+		int bulan= Integer.parseInt(args[0]);
+		int tahun = Integer.parseInt(args[1]);
+		
+		switch(bulan){
+			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(tahun%100==0 || tahun%100!=0 && tahun%400 == 0){
+					System.out.println("29");
+				}
+				else{
+					System.out.println("28");
+				}
+			break;
+			default:
+				System.out.println("Masukkan sesuai instruksi");
+		}
+		
+	}
+}
\ No newline at end of file
diff --git a/recfaktorial.java b/recfaktorial.java
new file mode 100644
index 0000000..7809bac
--- /dev/null
+++ b/recfaktorial.java
@@ -0,0 +1,19 @@
+public class recfaktorial{
+	public static void main(String[] args){
+		if(args.length!=1){
+			System.err.println("Usage: recfaktorial <angka>");
+			return;
+		}	
+		int n = Integer.parseInt(args[0]);
+		System.out.println(factorial(n));
+	}
+	
+	public static int factorial(int n){
+		if(n == 1){
+			return 1;
+		}
+		else{
+			return(n *factorial(n-1));
+		}
+	}
+}
diff --git a/score.java b/score.java
new file mode 100644
index 0000000..0e8e9fc
--- /dev/null
+++ b/score.java
@@ -0,0 +1,32 @@
+public class score{
+	public static void main(String[] args){
+		if(args.length != 1){
+			System.err.println("Usage: LetterGrade <numeric-number>");
+			return;
+		}
+		int score = Integer.parseInt(args[0]);
+				
+		if(score <= 100){
+			System.out.println("A");
+		}
+		else if(score <= 80){
+			System.out.println("B");
+		}
+		else if(score <= 60){
+			System.out.println("C");
+		}
+		else if(score <= 40){
+			System.out.println("D");
+		}
+		else if(score <= 20){
+			System.out.println("E");
+		}
+		else if(score <= 0){
+			System.out.println("Drop Out");
+		}
+		else{
+			System.out.println("Interval Nilai 0 - 100");
+		}
+		
+	}	
+}
\ No newline at end of file