diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5241a72
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.class
\ No newline at end of file
diff --git a/BubbleSort.java b/BubbleSort.java
new file mode 100644
index 0000000..8138b0e
--- /dev/null
+++ b/BubbleSort.java
@@ -0,0 +1,32 @@
+class BubbleSort{
+
+    public static void main(String[] args) {
+        if(args.length < 1){
+            System.out.println("Usage BubbleSort <arg1, ..., ...>");
+        
+            return;
+        }
+    
+        int arr[] = new int[args.length];
+
+        for(int i = 0; i < args.length; i++){
+            arr[i] = Integer.parseInt(args[i]);
+        }
+
+        for(int i = 0; i < arr.length-1; i++){
+            for(int j = i+1; j < arr.length; j++){
+                if(arr[j] < arr[i]){
+                    int temp = arr[j];
+                    arr[j] = arr[i];
+                    arr[i] = temp;
+                }
+            }
+        }
+
+        for(int i = 0; i < arr.length; i++){
+            System.out.print(arr[i] + " ");
+        }
+
+    }
+
+}
\ No newline at end of file
diff --git a/Calendar.java b/Calendar.java
new file mode 100644
index 0000000..f6daadb
--- /dev/null
+++ b/Calendar.java
@@ -0,0 +1,65 @@
+class Calendar{
+    public static void main(String args[]){
+        if(args.length < 1){
+            System.out.println("Usage Calendar <month>");
+            
+            return;
+        }
+
+        int month = Integer.parseInt(args[0]);
+        String res = "";
+
+        switch(month){
+            case 1:
+                res = "Januari";
+
+                break;
+            case 2:
+                res = "Febuari";
+
+                break;
+            case 3:
+                res = "Maret";
+
+                break;
+            case 4:
+                res = "April";
+
+                break;
+            case 5:
+                res = "Mei";
+
+                break;
+            case 6:
+                res = "Juni";
+
+                break;
+            case 7:
+                res = "Juli";
+
+                break;
+            case 8:
+                res = "Agustus";
+
+                break;
+            case 9:
+                res = "September";
+
+                break;
+            case 10:
+                res = "Oktober";
+
+                break;
+            case 11:
+                res = "November";
+
+                break;
+            case 12:
+                res = "Desember";
+
+                break;                
+        }
+        
+        System.out.println(res);
+    }
+}
\ No newline at end of file
diff --git a/Calendar2.java b/Calendar2.java
new file mode 100644
index 0000000..9fd1814
--- /dev/null
+++ b/Calendar2.java
@@ -0,0 +1,70 @@
+class Calendar2{
+    public static void main(String args[]){
+        if(args.length < 1){
+            System.out.println("Usage Calendar <year> <month>");
+            
+            return;
+        }
+
+        int month = Integer.parseInt(args[1]);
+        int year = Integer.parseInt(args[0]);
+        int day = 0;
+
+        switch(month){
+            case 1:
+                day = 31;
+
+                break;
+            case 2:
+                if((year % 4 == 0 && (year % 100 != 0)) || year % 400 == 0){
+                    day = 29;
+                }else{
+                    day = 28;
+                }
+
+                break;
+            case 3:
+                day = 31;
+
+                break;
+            case 4:
+                day = 30;
+
+                break;
+            case 5:
+                day = 31;   
+
+                break;
+            case 6:
+                day = 30;
+
+                break;
+            case 7:
+                day = 31;
+
+                break;
+            case 8:
+                day = 31;
+
+                break;
+            case 9:
+                day = 30;
+
+                break;
+            case 10:
+                day = 31;
+
+                break;
+            case 11:
+                day = 30;
+
+                break;
+            case 12:
+                day = 31;
+
+                break;                
+        }
+        
+        System.out.println(day);
+    }
+}
\ No newline at end of file
diff --git a/Faktorial.java b/Faktorial.java
new file mode 100644
index 0000000..e88b683
--- /dev/null
+++ b/Faktorial.java
@@ -0,0 +1,18 @@
+class Faktorial{
+
+    public static void main(String args[]) {
+        if(args.length < 1){
+            System.out.println("Usage Faktorial <number>");
+            
+            return;
+        }
+        
+        int res = 1;
+        
+        for(int i = 1; i <= Integer.parseInt(args[0]); i++){
+            res *= i;
+        }
+
+        System.out.println(res);
+    }
+}
\ No newline at end of file
diff --git a/Faktorial2.java b/Faktorial2.java
new file mode 100644
index 0000000..607be06
--- /dev/null
+++ b/Faktorial2.java
@@ -0,0 +1,20 @@
+class Faktorial2{
+    
+    public static void main(String args[]) {
+        if(args.length < 1){
+            System.out.println("Usage Faktorial <number>");
+            
+            return;
+        }
+
+        int n = Integer.parseInt(args[0]);
+        
+        System.out.println(faktorial(n));
+    }
+
+    public static int faktorial(int n){
+        if(n ==  0) return 1;
+        else return n*faktorial(n-1);
+    }
+
+}
\ No newline at end of file
diff --git a/Scoring.java b/Scoring.java
new file mode 100644
index 0000000..40b23fb
--- /dev/null
+++ b/Scoring.java
@@ -0,0 +1,27 @@
+import java.util.Scanner;
+
+class Scoring{
+    public static void main(String[] args) {
+        // Scanner sc = new Scanner(System.in);
+        // int score = sc.nextInt();
+        if(args.length < 1){
+            System.out.println("Usage Scoring <score>");
+
+            return;
+        }
+
+        int score = Integer.parseInt(args[0]);
+
+        if(score >= 80 && score <= 100){
+            System.out.println("A");
+        }else if(score >= 60 && score < 80){
+            System.out.println("B");
+        }else if(score >= 40 && score < 60){
+            System.out.println("C");
+        }else if(score >= 20 && score < 40){
+            System.out.println("D");
+        }else if(score >= 0 && score < 20){
+            System.out.println("E");
+        }
+    }
+}
\ No newline at end of file
diff --git a/Test.java b/Test.java
new file mode 100644
index 0000000..da2a804
--- /dev/null
+++ b/Test.java
@@ -0,0 +1,6 @@
+class Test{
+  public static void main(String args[]){
+    System.out.println("Hello World");
+    System.out.println("Alexander N. Salim");
+  }
+}
\ No newline at end of file