diff --git a/DEV2.1/TP7/Fond.class b/DEV2.1/TP7/Fond.class
new file mode 100644
index 0000000..18b14de
Binary files /dev/null and b/DEV2.1/TP7/Fond.class differ
diff --git a/DEV2.1/TP7/Fond.java b/DEV2.1/TP7/Fond.java
new file mode 100644
index 0000000..f88ee19
--- /dev/null
+++ b/DEV2.1/TP7/Fond.java
@@ -0,0 +1,35 @@
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+import java.io.*;
+
+public class Fond extends JPanel implements ActionListener {
+
+	public Fond(){
+		super();
+		JButton bouton = new JButton("Blue");
+		this.add(bouton);
+		JButton bouton2 = new JButton("Red");
+		this.add(bouton2);
+		JButton bouton3 = new JButton("Green");
+		this.add(bouton3);
+
+		bouton.addActionListener(this);
+		bouton2.addActionListener(this);
+		bouton3.addActionListener(this);
+	}
+
+	public void actionPerformed(ActionEvent e) 
+	{
+		
+       	if (e.getActionCommand()=="Blue") {
+       		this.setBackground(Color.BLUE);
+       	}
+       	if (e.getActionCommand()=="Red") {
+       		this.setBackground(Color.RED);
+       	}
+       	if (e.getActionCommand()=="Green") {
+       		this.setBackground(Color.GREEN);
+       	}
+    }
+}
\ No newline at end of file
diff --git a/DEV2.1/TP7/MainFond.java b/DEV2.1/TP7/MainFond.java
new file mode 100644
index 0000000..57d72d0
--- /dev/null
+++ b/DEV2.1/TP7/MainFond.java
@@ -0,0 +1,47 @@
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+
+public class MainFond {
+
+	public static void main(String[] args) {
+	 
+	 	int bg = 0
+		try 
+		{
+			FileInputStream fis = new FileInputStream("./save.bin");
+			DataInputStream dis = new DataInputStream(fis);
+			bg = dis.readInt();
+		}
+		catch(IOException e)
+		{
+			if(e=SecurityException)
+			{
+			System.out.println("probleme de lecture");
+			}
+		}
+		
+
+		JFrame fenetre = new JFrame();
+	    fenetre.setSize(1000, 1000);
+	    fenetre.setLocation(0, 0);
+	    
+		Fond tamere = new Fond();
+		if (bg==1) 
+		{
+			tamere.setBackground(Color.BLUE);	
+		}
+		if (bg==2) 
+		{
+			tamere.setBackground(Color.RED);
+		}
+		if (bg==3) 
+		{
+			tamere.setBackground(Color.GREEN);
+		}
+		fenetre.add(tamere, BorderLayout.CENTER);
+
+	    fenetre.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+	    fenetre.setVisible(true);	
+	}
+}
\ No newline at end of file
diff --git a/DEV2.1/TP7/image.java b/DEV2.1/TP7/image.java
new file mode 100644
index 0000000..0ffd3ee
--- /dev/null
+++ b/DEV2.1/TP7/image.java
@@ -0,0 +1,44 @@
+import java.io.*;
+import javax.swing.*;
+import java.awt.*;
+
+public class Image {
+	public static void main(String[] args) {
+		//ouverture du fichier
+		try
+		{
+			FileInputStream fos = new FileInputStream("image.bin");
+		}
+		catch(IOException e)
+		{
+			System.out.println("Erreur Ouverture du fichier");
+		}
+		try
+		{
+			BufferedImage img = new BufferedImage(768,1024,BufferedImage.TYPE_3BYTE_BGR);
+			for(int x = 0;x<768;x++)
+			{
+				for(int y = 0;y<1024;y++)
+				{
+					int r = input.read();
+					int g = input.read();
+					int b = input.read();
+					int rgb = (r<<16)|(g<<8)|(b);
+					img setRGB(x,y,rgb);
+				}
+			}
+		}
+		catch( IOException e)
+		{
+			System.out.println("Erreur Lecture du fichier");
+		}
+		
+		Frame frame = new JFrame();
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        JLabel image = new JLabel(new ImageIcon(img));
+        frame.add(image);
+        frame.pack();
+        frame.setVisible(true);
+
+	}
+}
\ No newline at end of file
diff --git a/DEV2.1/hasard/exo1/Primalite.class b/DEV2.1/hasard/exo1/Primalite.class
new file mode 100644
index 0000000..a75decb
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diff --git a/DEV2.1/hasard/exo1/Primalite.java b/DEV2.1/hasard/exo1/Primalite.java
new file mode 100644
index 0000000..7ace6c2
--- /dev/null
+++ b/DEV2.1/hasard/exo1/Primalite.java
@@ -0,0 +1,37 @@
+public class Primalite {
+	public static void main(String[] args) {
+		
+		for (int j=0;j<args.length;j++) 
+		{
+			int test = Integer.parseInt(args[j]);
+			int estPremier = 1;
+			int[] listDiviseur= new int[test];
+			int indexDiviseur = 0;
+			
+			for (int i=2;i<test;i++) 
+			{
+				if (test%i==0) 
+				{
+					estPremier = 0;
+					listDiviseur[indexDiviseur] = i;
+					indexDiviseur++;
+				}	
+			}
+			if (estPremier==1) 
+			{
+				System.out.println(test+" est Premier !");
+			}
+			else
+			{
+				System.out.println(test+" est non premier! liste des diviseur :");
+				for (int i =0;i<listDiviseur.length;i++) 
+				{
+					if (listDiviseur[i]!=0) {
+						System.out.print(listDiviseur[i]+" ");	
+						System.out.println();
+					}	
+				}
+			}
+		}
+	}
+}
\ No newline at end of file
diff --git a/DEV2.1/hasard/exo2/Entiexte.class b/DEV2.1/hasard/exo2/Entiexte.class
new file mode 100644
index 0000000..623aa38
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diff --git a/DEV2.1/hasard/exo2/Entiexte.java b/DEV2.1/hasard/exo2/Entiexte.java
new file mode 100644
index 0000000..9d98301
--- /dev/null
+++ b/DEV2.1/hasard/exo2/Entiexte.java
@@ -0,0 +1,85 @@
+import java.lang.Math;
+
+public class Entiexte
+{
+	private String repr;
+
+	public Entiexte(int i)
+	{
+		this.repr = Integer.toBinaryString(i);
+		this.repr = this.reverse(this.repr);
+	}
+
+	public Entiexte(String i)
+	{
+		int temp = Integer.parseInt(i);
+		this.repr = Integer.toBinaryString(temp);
+		this.repr = this.reverse(this.repr);
+	}
+
+	public String toString()
+	{
+		return this.repr;
+	}
+
+	private String reverse(String txt)
+	{
+		char temp;
+		char[] txt2 = txt.toCharArray();
+		for (int i = 0;i<txt.length()/2;i++) 
+		{
+			temp = txt2[txt.length()-(1+i)];
+			txt2[txt.length()-(1+i)]=txt2[i];
+			txt2[i]=temp;
+		}
+		txt = new String(txt2);
+		return txt;
+	}
+
+	public int toInt()
+	{
+		int out=0;
+		for (int i=0;i<this.repr.length();i++)
+		{
+			if(repr.charAt(i)=='1')
+			{
+				out+= Math.pow(2,i);
+			}
+		}
+		return out;
+	}
+
+	public boolean plusGrand(Entiexte e)
+	{
+		int test = 0;
+		if (this.repr.length()>e.repr.length()) 
+		{
+			return true;
+		}
+		else 
+		{
+			if (this.repr.length()<e.repr.length()) 
+			{
+				return false;
+			}
+			else
+			{
+				for (int i=this.repr.length()-1;i>=0;i--) 
+				{
+					if (this.repr.charAt(i)!=e.repr.charAt(i)) 
+					{
+						if (this.repr.charAt(i)=='1') 
+						{
+							return true;
+						}
+						else
+						{
+							return false;
+						}
+					}	
+				}
+			}
+		}
+		return false;
+	}
+}
\ No newline at end of file
diff --git a/DEV2.1/hasard/exo2/test.class b/DEV2.1/hasard/exo2/test.class
new file mode 100644
index 0000000..5026d28
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diff --git a/DEV2.1/hasard/exo2/test.java b/DEV2.1/hasard/exo2/test.java
new file mode 100644
index 0000000..3d85d06
--- /dev/null
+++ b/DEV2.1/hasard/exo2/test.java
@@ -0,0 +1,15 @@
+public class test
+{
+	public static void main(String[] args) {
+		
+		Entiexte test = new Entiexte("11");
+		System.out.println(test.toString());
+		System.out.println(test.toInt());
+		Entiexte test2 = new Entiexte("9");
+		Entiexte test3 = new Entiexte("11");
+		Entiexte test4 = new Entiexte("14");
+		System.out.println(test.plusGrand(test2));
+		System.out.println(test.plusGrand(test3));
+		System.out.println(test.plusGrand(test4));
+	}
+}
\ No newline at end of file
diff --git a/DEV2.1/hasard/exo3/ObjetAleatoire.class b/DEV2.1/hasard/exo3/ObjetAleatoire.class
new file mode 100644
index 0000000..13c3971
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diff --git a/DEV2.1/hasard/exo3/ObjetAleatoire.java b/DEV2.1/hasard/exo3/ObjetAleatoire.java
new file mode 100644
index 0000000..2c49e00
--- /dev/null
+++ b/DEV2.1/hasard/exo3/ObjetAleatoire.java
@@ -0,0 +1,5 @@
+public interface ObjetAleatoire
+{
+	void lancer();
+	int lire();
+}
\ No newline at end of file
diff --git a/DEV2.1/hasard/exo3/Piece.class b/DEV2.1/hasard/exo3/Piece.class
new file mode 100644
index 0000000..f41b915
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diff --git a/DEV2.1/hasard/exo3/Piece.java b/DEV2.1/hasard/exo3/Piece.java
new file mode 100644
index 0000000..fa09222
--- /dev/null
+++ b/DEV2.1/hasard/exo3/Piece.java
@@ -0,0 +1,25 @@
+import java.util.Random;
+
+
+public class Piece implements ObjetAleatoire
+{
+	Random rnd = new Random(System.currentTimeMillis());
+
+	private int pof;
+
+	public void lancer()
+	{
+		this.pof = rnd.nextInt(2);
+	}
+
+	public int lire()
+	{
+		return this.pof;
+	}
+
+	public static void main(String[] args) {
+		Piece test = new Piece();
+		test.lancer();
+		System.out.println(test.lire());
+	}
+}
\ No newline at end of file
diff --git a/DEV2.1/hasard/reponses.tar b/DEV2.1/hasard/reponses.tar
new file mode 100644
index 0000000..32f1aae
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