diff --git a/BlnTahun.java b/BlnTahun.java
new file mode 100644
index 0000000..a51fd54
--- /dev/null
+++ b/BlnTahun.java
@@ -0,0 +1,33 @@
+public class BlnTahun{
+	public static void main(String[] args){
+		if(args.length != 2){
+			System.out.println("Usage: MonthFromNumber <month>");
+			return;
+		}
+		int bln= Integer.parseInt(args[0]);
+		int thn= Integer.parseInt(args[1]);
+		int hri=0;
+		
+		switch(bln){
+			case 1:
+			case 3:
+			case 5:
+			case 7:
+			case 8:
+			case 10:
+			case 12:
+				hri=31; break;
+			case 2: hri=((thn%4==0) && !(thn%100==0) || (thn%400==0)) ? 29 : 28; break;			
+			case 4: 
+			case 6:
+			case 9:
+			case 11:
+				hri=30; break;
+			default: System.out.println("Maaf Anda hanya bisa memasukkan bulan dari 1-12!"); break;
+		}
+		if(hri==31) System.out.println("Hari=31");
+		else if(hri==30) System.out.println("Hari=30");
+		else if(hri==29) System.out.println("Hari=29");
+		else if(hri==28) System.out.println("Hari=28");
+	}
+}
\ No newline at end of file
diff --git a/BubbleSort.java b/BubbleSort.java
new file mode 100644
index 0000000..fd79f13
--- /dev/null
+++ b/BubbleSort.java
@@ -0,0 +1,28 @@
+public class BubbleSort{
+	public static void main(String[] args){
+		int length = args.length;
+		int[] arrNum = new int[length];
+		
+		for(int i=0; i<length; i++){
+			arrNum[i] = Integer.parseInt(args[i]);
+		}
+		
+		sort(arrNum, length);
+	}
+	
+	public static void sort(int arrNum[], int length){
+		for(int a=0; a<length; a++){
+			for(int b=0; b<length-1; b++){
+				if(arrNum[b]>arrNum[b+1]){
+					int temp = arrNum[b];
+					arrNum[b] = arrNum[b+1];
+					arrNum[b+1] = temp;
+				}
+			}
+			
+		}
+		for(int a=0; a<length; a++){
+			System.out.print(arrNum[a]+ " ");
+		}
+	}
+}
\ No newline at end of file
diff --git a/Calendar.java b/Calendar.java
new file mode 100644
index 0000000..ff35659
--- /dev/null
+++ b/Calendar.java
@@ -0,0 +1,26 @@
+public class Calendar{
+	public static void main(String[] args){
+		if(args.length != 1){
+			System.out.println("Usage: MonthFromNumber <month>");
+			return;
+		}
+		int x= Integer.parseInt(args[0]);
+		
+		
+		switch(x){
+			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;
+			default: System.out.println("Maaf Anda hanya bisa memasukkan bulan dari 1-12!"); break;
+		}
+	}
+}
\ No newline at end of file
diff --git a/Faktorial.java b/Faktorial.java
new file mode 100644
index 0000000..1fc5060
--- /dev/null
+++ b/Faktorial.java
@@ -0,0 +1,16 @@
+public class Faktorial{
+	public static void main(String[] args){
+		if(args.length != 1){
+			System.out.println("Usage: Faktorial <number>");
+			return;
+		}
+		long f=1;
+		int angka=0;
+		angka= Integer.parseInt(args[0]);
+		
+		for(int i=1; i<=angka; i++){
+			f *=i;			
+		}
+		System.out.println("Faktorial dari "+angka+" adalah "+f);
+	}
+}
\ No newline at end of file
diff --git a/HelloWorld.java b/HelloWorld.java
new file mode 100644
index 0000000..d8cbae7
--- /dev/null
+++ b/HelloWorld.java
@@ -0,0 +1,28 @@
+//import javax.swing.*;
+
+public class HelloWorld{
+	public static void main(String[] args){
+		//System.out.println("Hello World!");
+		if(args.length != 1){
+			System.out.println("Usage: LetterScore <numeric> ");
+			return;
+		}
+		
+		int x= Integer.parseInt(args[0]);
+		
+		
+		if(x >0 && x<=20){
+			System.out.println("Score = E");
+		}else if(x >20 && x<=40){
+			System.out.println("Score = D");
+		}else if(x >40 && x<=60){
+			System.out.println("Score = C");
+		}else if(x >60 && x<=80){
+			System.out.println("Score = B");
+		}else if(x >80 && x<=100){
+			System.out.println("Score = A");
+		}else{
+			System.out.println("Maaf, Anda hanya bisa memasukkan angka 1-100!");
+		}
+	}
+}
\ No newline at end of file
diff --git a/Rekursif.java b/Rekursif.java
new file mode 100644
index 0000000..af31aff
--- /dev/null
+++ b/Rekursif.java
@@ -0,0 +1,18 @@
+public class Rekursif{
+	public static void main(String[] args){
+		if(args.length != 1){
+			System.out.println("Usage: Rekursif <number>");
+			return;
+		}
+		int n= Integer.parseInt(args[0]);
+		System.out.println(rek(n));
+	}
+	
+	public static int rek(int n){
+		if(n==0 || n==1){
+			return 1;
+		}else{
+			return n* rek(n-1);
+		}
+	}
+}
\ No newline at end of file