diff --git a/DEV2.1/TP4:Heritage/Documentation/Deuxieme.class b/DEV2.1/TP4:Heritage/Documentation/Deuxieme.class
new file mode 100644
index 0000000..42804a6
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diff --git a/DEV2.1/TP4:Heritage/Documentation/Deuxieme.java b/DEV2.1/TP4:Heritage/Documentation/Deuxieme.java
new file mode 100644
index 0000000..3c47329
--- /dev/null
+++ b/DEV2.1/TP4:Heritage/Documentation/Deuxieme.java
@@ -0,0 +1,11 @@
+
+public class Deuxieme{
+
+	public static void main(String[] args) {
+		if (args.length <= 0){
+			System.err.println("args missing");
+			System.exit(1);
+		} Integer parseInt8 = Integer.parseInt(args[0], 8);
+		System.out.println(Integer.toHexString(parseInt8));
+	}
+}
\ No newline at end of file
diff --git a/DEV2.1/TP4:Heritage/Documentation/Premier.class b/DEV2.1/TP4:Heritage/Documentation/Premier.class
new file mode 100644
index 0000000..13ce390
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diff --git a/DEV2.1/TP4:Heritage/Documentation/Premier.java b/DEV2.1/TP4:Heritage/Documentation/Premier.java
new file mode 100644
index 0000000..a241996
--- /dev/null
+++ b/DEV2.1/TP4:Heritage/Documentation/Premier.java
@@ -0,0 +1,10 @@
+import java.lang.*;
+
+public class Premier{
+
+	public static void main(String[] args) {
+		for (String arg: args){
+			System.out.println(arg.toUpperCase());
+		}
+	}
+}
\ No newline at end of file
diff --git a/DEV2.1/TP4:Heritage/Grisaille.class b/DEV2.1/TP4:Heritage/Grisaille.class
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diff --git a/DEV2.1/TP4:Heritage/Grisaille.java b/DEV2.1/TP4:Heritage/Grisaille.java
new file mode 100644
index 0000000..6657ca1
--- /dev/null
+++ b/DEV2.1/TP4:Heritage/Grisaille.java
@@ -0,0 +1,24 @@
+import javax.swing.*;
+import java.awt.*;
+
+public class Grisaille extends Color{
+
+	public Grisaille(int val){
+		super(val, val, val);
+	}
+
+	public static void main(String[] args) {
+		if (args.length <= 0){
+			System.err.println("args missing");
+			System.exit(1);
+		} Integer arg = Integer.parseInt(args[0], 10);
+		JFrame fenetre = new JFrame();
+		fenetre.setSize(400, 200);
+    	fenetre.setLocation(0, 0);
+    	fenetre.setVisible(true);
+    	JPanel panel = new JPanel();
+    	panel.setBackground(new Grisaille(arg));
+    	fenetre.add(panel);
+    	fenetre.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+	}
+}
\ No newline at end of file