diff --git a/BubbleSort.java b/BubbleSort.java
new file mode 100644
index 0000000..5e71c93
--- /dev/null
+++ b/BubbleSort.java
@@ -0,0 +1,22 @@
+public class BubbleSort{
+	public static void main(String[] args){
+            int numberArray[] = new int[args.length];
+            for(int i=0; i<args.length;i++){
+                numberArray[i] = Integer.parseInt(args[i]);
+            }
+
+            for(int i=0; i<numberArray.length; i++){
+                for(int j=0;j<numberArray.length;j++){
+                    if(numberArray[i]<numberArray[j]){
+                        numberArray[i] = numberArray[i]*numberArray[j];
+                        numberArray[j] = numberArray[i]/numberArray[j];
+                        numberArray[i] = numberArray[i]/numberArray[j];
+                    }
+                }
+            }
+
+            for(int i=0; i<numberArray.length; i++){
+                System.out.println(numberArray[i]);
+            }
+	}
+}
diff --git a/Calendar.java b/Calendar.java
new file mode 100644
index 0000000..76accc7
--- /dev/null
+++ b/Calendar.java
@@ -0,0 +1,51 @@
+public class Calendar{
+	public static void main(String[] args){
+		if(args.length != 1){
+            System.out.println("Usage: Calendar <MonthNumber>");
+            return;
+		}
+
+		int month = Integer.parseInt(args[0]);
+		switch(month){
+			case 1:
+				System.out.println("Bulan Januari");
+				break;
+			case 2:
+				System.out.println("Bulan Februari");
+				break;
+			case 3:
+				System.out.println("Bulan Maret");
+				break;
+			case 4:
+				System.out.println("Bulan April");
+				break;
+			case 5:
+				System.out.println("Bulan Mei");
+				break;
+			case 6:
+				System.out.println("Bulan Juni");
+				break;
+			case 7:
+				System.out.println("Bulan Juli");
+				break;
+			case 8:
+				System.out.println("Bulan Agustus");
+				break;
+			case 9:
+				System.out.println("Bulan September");
+				break;
+			case 10:
+				System.out.println("Bulan Oktober");
+				break;																																
+			case 11:
+				System.out.println("Bulan November");
+				break;
+			case 12:
+				System.out.println("Bulan Desember");
+				break;							
+			default:
+				System.out.println("Bulan Tidak Valid");
+				break;	
+		}
+	}
+}
\ No newline at end of file
diff --git a/DayCount.java b/DayCount.java
new file mode 100644
index 0000000..46701f0
--- /dev/null
+++ b/DayCount.java
@@ -0,0 +1,42 @@
+public class DayCount{
+    public static void main(String[] args){
+        if(args.length != 2){
+            System.out.println("Usage: dayCount <monthNum yearNum>");
+            return;
+        }
+        int month = Integer.parseInt(args[0]);
+        int year = Integer.parseInt(args[1]);
+        int days = 0;
+        switch(month){
+            case 1:
+            case 3:
+            case 5:
+            case 7:
+            case 8:
+            case 10:
+            case 12:
+                days = 31;
+                break;
+            case 4:
+            case 6:
+            case 9:                                                                                                                              
+            case 11:
+                days = 30;
+                break;                          
+            case 2:
+                switch(year%4){
+                    case 0:
+                        days = 29;
+                        break;
+                    default:
+                        days = 28;
+                        break;
+                }
+                break;
+            default:
+                System.out.println("Tanggal Tidak Valid");
+                break;  
+        }
+        System.out.println("Jumlah hari adalah " + days + " hari");
+    }
+}
\ No newline at end of file
diff --git a/Factorial.java b/Factorial.java
new file mode 100644
index 0000000..b01e884
--- /dev/null
+++ b/Factorial.java
@@ -0,0 +1,20 @@
+public class Factorial{
+	public static void main(String[] args){
+        if(args.length != 1){
+            System.out.println("Usage: Factorial <number>");
+            return;
+        }
+
+        int total = 1;
+        int fact = Integer.parseInt(args[0]);
+        for(int i=1; i<=fact; i++){
+        	if(fact == 0){
+        		total = 1;
+        	}
+        	else{
+        		total*= i;
+        	}
+        }
+        System.out.println("Jumlah factorial adalah: " + total);
+	}
+}
\ No newline at end of file
diff --git a/LetterGrade.java b/LetterGrade.java
new file mode 100644
index 0000000..efcffae
--- /dev/null
+++ b/LetterGrade.java
@@ -0,0 +1,24 @@
+public class LetterGrade{
+    public static void main(String[] args){
+        if(args.length != 1){
+            System.out.println("Usage: LetterGrade <numeric-sscore>");
+            return;
+        }
+        int score = Integer.parseInt(args[0]);
+        if(score <20){
+            System.out.println("Nilai anda E");
+        }
+        else if(score <40){
+            System.out.println("Nilai anda D");
+        }
+        else if(score <60){
+            System.out.println("Nilai anda C");
+        }
+        else if(score <80){
+            System.out.println("Nilai anda B");
+        }
+        else{
+            System.out.println("Nilai anda A");
+        }
+    }
+}
\ No newline at end of file
diff --git a/Recursion.java b/Recursion.java
new file mode 100644
index 0000000..4a3d4f6
--- /dev/null
+++ b/Recursion.java
@@ -0,0 +1,18 @@
+public class Recursion{
+	public static void main(String[] args){
+        if(args.length != 1){
+            System.out.println("Usage: Recursion <number>");
+        }
+            int fact = Integer.parseInt(args[0]);
+            int jawab = 1;
+            jawab = count(fact);
+            System.out.println("Total perhiitungan adalah: "+jawab);
+	}
+
+    public static int count(int  fact){
+        if(fact==1)return 1;
+        int total = fact*count(fact-1);
+        return total;
+    }
+
+}