diff --git a/DEV2.1/random/point.class b/DEV2.1/random/point.class
new file mode 100644
index 0000000..acab74a
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diff --git a/DEV2.1/random/point.java b/DEV2.1/random/point.java
new file mode 100644
index 0000000..1a8dfdb
--- /dev/null
+++ b/DEV2.1/random/point.java
@@ -0,0 +1,27 @@
+import java.awt.Point;
+
+public class point
+{
+	public static void main(String[] args) 
+	{
+		Point[] tab =new Point[10];
+		int x;
+		int y;
+		for (int i = 0;i<10;i++) 
+		{
+			
+			x = (int)(Math.random()*200)-100;
+			y = (int)(Math.random()*200)-100;	
+			tab[i] = new Point(x,y);	
+		}
+		for (int i = 0;i<10;i++) 
+		{
+			for (int j = 0;j<10;j++) 
+			{
+				System.out.println("la distance entre le point "+
+					i+"et le point"+j+"est de:"+tab[i].distance(tab[j]));
+			}
+				System.out.println();
+		}
+	}
+}
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diff --git a/DEV2.1/random/test.class b/DEV2.1/random/test.class
new file mode 100644
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diff --git a/DEV2.1/random/test.java b/DEV2.1/random/test.java
new file mode 100644
index 0000000..c25ffce
--- /dev/null
+++ b/DEV2.1/random/test.java
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+public class test
+{
+	public static void main(String[] args) 
+	{
+		for (int i=args.length-1;i>=0; i--) 
+		{
+			System.out.println(args[i]);			
+		}	
+	}
+}
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diff --git a/DEV2.1/random/test2.class b/DEV2.1/random/test2.class
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index 0000000..b56fbe8
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diff --git a/DEV2.1/random/test2.java b/DEV2.1/random/test2.java
new file mode 100644
index 0000000..57e25c9
--- /dev/null
+++ b/DEV2.1/random/test2.java
@@ -0,0 +1,10 @@
+public class test2
+{
+	public static void main(String[] args) 
+	{
+		for (int i=args[0].length()-1;i>=0; i--) 
+		{
+			System.out.print(args[0].charAt(i));			
+		}	
+	}
+}
\ No newline at end of file