diff --git a/BubbleSort.java b/BubbleSort.java
new file mode 100644
index 0000000..801797b
--- /dev/null
+++ b/BubbleSort.java
@@ -0,0 +1,35 @@
+/* 	Nama File : BubbleSort.java
+	Nico G. S. Panjaitan
+*/
+
+public class BubbleSort {
+	
+	public static void main (String[] args) {
+
+		if (args.length < 1) {
+			System.err.println ("Usage:Input form <al1, al2, ...,>");
+			return;
+		}
+		
+		int list[] = new int [args.length];
+		
+		for (int i = 0; i < args.length; i++){
+			list[i] = Integer.parseInt(args[i]);
+		}
+		
+		for(int i=0; i<list.length; i++){
+			for(int j=i + 1; j<list.length; j++){
+				if(list[i] > list[j]){
+					int temp = list[i];
+					list[i] = list[j];
+					list[j] = temp;
+				}
+			}
+		}
+		
+		System.out.print("Hasil setelah Bubble Sort: ");
+		for(int i=0; i<list.length; i++){
+			System.out.print(list[i] + " " );
+		}	
+	}
+}
\ No newline at end of file
diff --git a/Calender.java b/Calender.java
new file mode 100644
index 0000000..b6f3c4c
--- /dev/null
+++ b/Calender.java
@@ -0,0 +1,57 @@
+/* 	Nama File : Calender.java
+	Nico G. S. Panjaitan
+*/
+
+public class Calender {
+	public static void main (String[] args) {
+	
+		if (args.length != 1) {
+			System.out.println ("Usage:Month form number <month>");
+			return;
+		}
+	
+		int month = Integer.parseInt(args[0]);
+		switch (month) {
+			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("Masukkan angka pilihan <bulan> 1-12");
+		
+		}
+	}
+		
+}
\ No newline at end of file
diff --git a/Calender2.java b/Calender2.java
new file mode 100644
index 0000000..b664c09
--- /dev/null
+++ b/Calender2.java
@@ -0,0 +1,50 @@
+/* 	Nama File : Calender2.java
+	Nico G. S. Panjaitan
+*/
+
+public class Calender2 {
+	public static void main (String[] args) {
+	
+		if (args.length != 2) {
+			System.out.println ("Usage:Month form number <month>");
+			return;
+		}
+	
+		int month = Integer.parseInt(args[0]);
+		int year = Integer.parseInt (args[1]);
+		
+		
+		switch (month) {
+			case 1:
+			case 3:
+			case 5: 
+			case 7:
+			case 8: 
+			case 10:
+			case 12:
+				System.out.println (31);
+				break;
+			
+			case 2:
+				if(((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0 ))
+				{
+					System.out.println (29);
+				}
+				else 
+					System.out.println (28);
+			break;
+			
+			case 4:
+			case 6:
+			case 9:
+			case 11:
+				System.out.println (30);
+				break;
+			
+			default :
+				System.out.println("Masukkan angka pilihan <bulan> 1-12");
+		
+		}
+	}
+		
+}
\ No newline at end of file
diff --git a/FactorRek.java b/FactorRek.java
new file mode 100644
index 0000000..36bad5e
--- /dev/null
+++ b/FactorRek.java
@@ -0,0 +1,23 @@
+/* 	Nama File : FactorRek.java
+	Nico G. S. Panjaitan
+*/
+
+public class FactorRek {
+	public static int factorial (int angka) {
+		if (angka == 0) 
+			return 1;
+		else
+			return (angka * factorial(angka-1));
+	}
+	
+	public static void main (String[] args) {
+		if (args.length != 1) {
+			System.out.println ("Usage:Input form <number>");
+			return;
+		}
+		
+		int angka = Integer.parseInt (args[0]);
+		
+		System.out.println("Factorial dari " + angka + " adalah " + factorial(angka));
+    }
+}
\ No newline at end of file
diff --git a/Factorial.java b/Factorial.java
new file mode 100644
index 0000000..9607994
--- /dev/null
+++ b/Factorial.java
@@ -0,0 +1,20 @@
+/* 	Nama File : Factorial.java
+	Nico G. S. Panjaitan
+*/
+
+public class Factorial {
+	public static void main (String[] args) {
+		if (args.length != 1) {
+			System.out.println ("Usage: factorial form <number>");
+			return;
+		}
+		int fak = 1;
+		int angka = Integer.parseInt (args[0]);
+		
+		for(int i=1; i<=angka; i++){
+            fak = fak * i;
+        }
+		
+        System.out.println("Faktorialnya "+angka+" adalah "+fak);
+    }
+}
\ No newline at end of file
diff --git a/Score.java b/Score.java
new file mode 100644
index 0000000..e04404f
--- /dev/null
+++ b/Score.java
@@ -0,0 +1,34 @@
+/* 	Nama File : Score.java
+	Nico G. S. Panjaitan
+*/
+
+public class Score {
+	public static void main (String[] args) {
+			
+		if (args.length != 1) {
+			System.out.println ("Usage:Score form-number <month>");
+			return;
+		}
+		
+		int score = Integer.parseInt (args[0]);
+		
+		if( score < 30)  {
+			System.out.println("E");
+		}
+		else if( score < 40) {
+			System.out.println("D");
+		}
+		else if( score < 50) {
+			System.out.println("C");
+		}
+		else if( score < 60) {
+			System.out.println("B");
+		}
+		else if( score < 70) {
+			System.out.println("AB");
+		}
+		else {
+			System.out.println("A");
+		}
+	}
+}
\ No newline at end of file