diff --git a/APL2.1/TP11/Playlist/Observer.class b/APL2.1/TP11/Playlist/Observer.class
new file mode 100644
index 0000000..1b2555c
Binary files /dev/null and b/APL2.1/TP11/Playlist/Observer.class differ
diff --git a/APL2.1/TP11/Playlist/Observer.java b/APL2.1/TP11/Playlist/Observer.java
new file mode 100644
index 0000000..e40b258
--- /dev/null
+++ b/APL2.1/TP11/Playlist/Observer.java
@@ -0,0 +1,40 @@
+import java.awt.*;
+import java.awt.event.*;
+import javax.swing.*;
+
+public class Observer implements MouseListener {
+    private JLabel prevSelected;
+
+    public void mouseClicked(MouseEvent evenement) {
+        JLabel lb = (JLabel)evenement.getSource();
+        if (prevSelected != null) {
+            prevSelected.setBackground(new Color(255, 255, 255));
+        }
+
+        lb.setBackground(new Color(0, 255, 255));
+        prevSelected = lb;
+    }
+
+    public void mouseEntered(MouseEvent evenement) {
+        JLabel lb = (JLabel)evenement.getSource();
+
+        if (lb == prevSelected) {
+            lb.setBackground(new Color(0, 255, 255));
+        } else {
+            lb.setBackground(new Color(200, 200, 200));
+        }
+    }
+
+    public void mouseExited(MouseEvent evenement) {
+        JLabel lb = (JLabel)evenement.getSource();
+
+        if (lb == prevSelected) {
+            lb.setBackground(new Color(0, 200, 255));
+        } else {
+            lb.setBackground(new Color(255, 255, 255));
+        }
+    }
+
+    public void mousePressed(MouseEvent evenement) {}
+    public void mouseReleased(MouseEvent evenement) {}
+}
\ No newline at end of file
diff --git a/APL2.1/TP11/Playlist/Playlist.class b/APL2.1/TP11/Playlist/Playlist.class
new file mode 100644
index 0000000..ac0f366
Binary files /dev/null and b/APL2.1/TP11/Playlist/Playlist.class differ
diff --git a/APL2.1/TP11/Playlist/Playlist.java b/APL2.1/TP11/Playlist/Playlist.java
index 31ae505..e1c5870 100644
--- a/APL2.1/TP11/Playlist/Playlist.java
+++ b/APL2.1/TP11/Playlist/Playlist.java
@@ -2,42 +2,22 @@ import java.awt.*;
 import java.awt.event.*;
 import javax.swing.*;
 
-public class Playlist extends JPanel implements MouseListener {
-    private JLabel prevSelection;
-    private JLabel prevHover;
-
-    public void mouseClicked(MouseEvent evenement) {
-        JLabel raiser = evenement.getComponent();
-        raiser.setBackground(new Color(0, 150, 255));
-
-        if (prevSelection != null) {
-            prevSelection.setBackground(new Color(255, 255, 255));
-        }
-    }
-
-    public void mouseEntered(MouseEvent evenement) {
-        
-    }
-
-    public void mouseExited(MouseEvent evenement) {
-
-    }
-
-    public void mousePressed(MouseEvent evenement) {}
-    public void mouseReleased(MouseEvent evenement) {}
-
-    @Override
-    public void paintComponent(Graphics brush) {
-
-    }
+public class Playlist extends JPanel {
+    private int elementCount;
+    private Observer obs;
 
     public Playlist() {
         super();
+        elementCount = 0;
+        obs = new Observer();
     }
 
     public void add(String title) {
+        elementCount += 1;
+        this.setLayout(new GridLayout(elementCount, 1));
+
         JLabel l = new JLabel(title);
-        l.addMouseListener(this);
+        l.addMouseListener(obs);
         l.setOpaque(true);
         this.add(l);
     }
diff --git a/APL2.1/TP11/Playlist/TestPlaylist.class b/APL2.1/TP11/Playlist/TestPlaylist.class
new file mode 100644
index 0000000..5d9af3f
Binary files /dev/null and b/APL2.1/TP11/Playlist/TestPlaylist.class differ
diff --git a/APL2.1/TP11/Playlist/TestPlaylist.java b/APL2.1/TP11/Playlist/TestPlaylist.java
index e69de29..ce147e7 100644
--- a/APL2.1/TP11/Playlist/TestPlaylist.java
+++ b/APL2.1/TP11/Playlist/TestPlaylist.java
@@ -0,0 +1,25 @@
+import java.awt.*;
+import javax.swing.*;
+
+public class TestPlaylist {
+    public static void main(String[] args) {
+        JFrame f = new JFrame("Fond");
+        f.setSize(200, 210);
+        f.setLocation(100, 100);
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        
+        Playlist p = new Playlist();
+        p.add("Speak To Me / Breathe");
+        p.add("On The Run");
+        p.add("Time");
+        p.add("The Great Gig In The Sky");
+        p.add("Money");
+        p.add("Us and Them");
+        p.add("Any Colour You Like");
+        p.add("Brain Damage");
+        p.add("Eclipse");
+
+        f.add(p);
+        f.setVisible(true);
+    }
+}
\ No newline at end of file
diff --git a/APL2.1/TP11/Rectangle/Observer.java b/APL2.1/TP11/Rectangle/Observer.java
new file mode 100644
index 0000000..54a2201
--- /dev/null
+++ b/APL2.1/TP11/Rectangle/Observer.java
@@ -0,0 +1,26 @@
+public class Observer implements MouseMotionListener, MouseListener {
+    public Observer() {}
+
+    void mouseClicked(MouseEvent evenement) {}
+    void mouseEntered(MouseEvent evenement) {}
+    void mouseExited(MouseEvent evenement) {}
+    void mouseMoved(MouseEvent evenement) {}
+
+    void mousePressed(MouseEvent evenement) {
+        Rectangle rect = (Rectangle)evenement.getSource();
+        rect.SetX(evenement.getX());
+        rect.SetY(evenement.getY());
+        rect.ShouldDraw(true);
+    }
+
+    void mouseReleased(MouseEvent evenement) {
+        Rectangle rect = (Rectangle)evenement.getSource();
+        rect.ShouldDraw(false);
+    }
+
+    void mouseDragged(MouseEvent evenement) {
+        Rectangle rect = (Rectangle)evenement.getSource();
+        rect.SetSX(evenement.getX());
+        rect.SetSY(evenement.getY());
+    }
+}
\ No newline at end of file
diff --git a/APL2.1/TP11/Rectangle/Rectangle.java b/APL2.1/TP11/Rectangle/Rectangle.java
new file mode 100644
index 0000000..690284d
--- /dev/null
+++ b/APL2.1/TP11/Rectangle/Rectangle.java
@@ -0,0 +1,62 @@
+public class Rectangle extends JComponent {
+    private int X;
+    private int Y;
+    private int SX;
+    private int SY;
+    private boolean shouldDraw;
+
+    public Rectangle() {
+        shouldDraw = false;
+        X = 0;
+        Y = 0;
+        SX = 0;
+        SY = 0;
+    }
+
+    public void SetX(int X) {
+        this.X = X;
+    }
+
+    public void SetY(int Y) {
+        this.Y = Y;
+    }
+
+    public void SetSX(int SX) {
+        this.SX = SX;
+    }
+
+    public void SetSY(int SY) {
+        this.SY = SY;
+    }
+
+    public void ShouldDraw(boolean shouldDraw) {
+        this.shouldDraw = shouldDraw;
+    }
+
+    @Override
+    protected void paintComponent(Graphics brush) {
+        Graphics newBrush = brush.create();
+        
+        if (this.isOpaque()) {
+            newBrush.setColor(this.getBackground());
+            newBrush.fillRect(0, 0, this.getWidth(), this.getHeight());
+        }
+
+        if (this.shouldDraw) {
+            newBrush.setColor(new Color(0, 220, 255));
+            if (X < SX) {
+                int buff = X;
+                X = SX;
+                SX = buff;
+            }
+
+            if (Y < SY) {
+                int buff = Y;
+                Y = SY;
+                SY = buff;
+            }
+
+            
+        }
+    }
+}
\ No newline at end of file
diff --git a/APL2.1/TP11/Rectangle/TestRectangle.java b/APL2.1/TP11/Rectangle/TestRectangle.java
new file mode 100644
index 0000000..fdac8b8
--- /dev/null
+++ b/APL2.1/TP11/Rectangle/TestRectangle.java
@@ -0,0 +1,12 @@
+public class TestRectangle {
+    public static void main(String[] args) {
+        JFrame f = new JFrame("Fond");
+        f.setSize(700, 200);
+        f.setLocation(100, 100);
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+        Rectangle r = new Rectangle();
+        r.addMouseMotionListener(new Observer());
+        f.setVisible(true);
+    }
+}
\ No newline at end of file
diff --git a/APL2.1/TP12/Apparences/Apparences.class b/APL2.1/TP12/Apparences/Apparences.class
new file mode 100644
index 0000000..1b91f50
Binary files /dev/null and b/APL2.1/TP12/Apparences/Apparences.class differ
diff --git a/APL2.1/TP12/Apparences/Apparences.java b/APL2.1/TP12/Apparences/Apparences.java
new file mode 100644
index 0000000..72ac66f
--- /dev/null
+++ b/APL2.1/TP12/Apparences/Apparences.java
@@ -0,0 +1,62 @@
+import java.awt.*;
+import javax.swing.*;
+import java.awt.event.*;
+
+class Observer implements ActionListener {
+    public Observer() {
+
+    }
+
+    public void actionPerformed(ActionEvent evt) {
+        String name = evt.getActionCommand();
+        JPanel f = (JPanel)((JButton)evt.getSource()).getParent();
+
+
+        if (name == "Jaune") {
+            f.setBackground(Color.YELLOW);
+        } else if (name == "Cyan") {
+            f.setBackground(Color.CYAN);
+        } else if (name == "Magenta") {
+            f.setBackground(Color.MAGENTA);
+        }
+    }
+}
+
+public class Apparences {
+
+    public static void main(String[] args) {
+        try {
+            UIManager.setLookAndFeel("toto");
+        } catch (ClassNotFoundException e) {
+            System.err.println("CONCENTRE TOI NOM DE DIEU !!");
+
+        } catch (ClassCastException e) {
+            System.err.println("Tu pourrais te concentrer et coder bien ?");
+            
+        } catch (Exception e) {
+            System.err.println("Prout !");
+        }
+
+        JFrame f = new JFrame("Fond");
+        f.setSize(200, 200);
+        f.setLocation(100, 100);
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        f.setLayout(new GridLayout(1, 3));
+
+        JButton b1 = new JButton("Jaune");
+        JButton b2 = new JButton("Cyan");
+        JButton b3 = new JButton("Magenta");
+
+        Observer observer = new Observer();
+
+        b1.addActionListener(observer);
+        b2.addActionListener(observer);
+        b3.addActionListener(observer);
+
+        f.add(b1);
+        f.add(b2);
+        f.add(b3);
+
+        f.setVisible(true);
+    }
+}
\ No newline at end of file
diff --git a/APL2.1/TP12/Apparences/Observer.class b/APL2.1/TP12/Apparences/Observer.class
new file mode 100644
index 0000000..2faf9fd
Binary files /dev/null and b/APL2.1/TP12/Apparences/Observer.class differ
diff --git a/APL2.1/TP12/Apparences/Volume.class b/APL2.1/TP12/Apparences/Volume.class
new file mode 100644
index 0000000..904da5f
Binary files /dev/null and b/APL2.1/TP12/Apparences/Volume.class differ
diff --git a/APL2.1/TP12/Apparences/Volume.java b/APL2.1/TP12/Apparences/Volume.java
new file mode 100644
index 0000000..af09c3a
--- /dev/null
+++ b/APL2.1/TP12/Apparences/Volume.java
@@ -0,0 +1,41 @@
+import java.awt.*;
+import java.awt.event.*;
+
+import javax.swing.*;
+
+public class Volume extends JComponent implements MouseWheelListener {
+    private static final int margin = 10;
+    private static final int numCircles = 10;
+    private int currentLevel = 0;
+
+    public void mouseWheelMoved(MouseWheelEvent ev) {
+        currentLevel -= ev.getWheelRotation();
+        currentLevel = Math.max(0, Math.min(currentLevel, 11));
+        repaint();
+    }
+
+    @Override
+    protected void paintComponent(Graphics brush) {
+        Graphics newBrush = brush.create();
+        
+        if (this.isOpaque()) {
+            newBrush.setColor(this.getBackground());
+            newBrush.fillRect(0, 0, this.getWidth(), this.getHeight());
+        }
+
+        newBrush.setColor(new Color(50, 50, 50));
+        newBrush.fillRect(0, 0, getWidth(), getHeight());
+
+
+        for (int i = 0; i < numCircles; i++) {
+            if (currentLevel > i) newBrush.setColor(new Color(230, 170, 0));
+            else newBrush.setColor(new Color(200, 200, 200));
+
+            newBrush.fillOval(margin + (getWidth() - margin * 2) / numCircles * i, getHeight() / 2, getHeight() / 4, getHeight() / 4);
+        }
+    }
+
+    public Volume() {
+        super();
+    }
+}
\ No newline at end of file
diff --git a/APL2.1/TP12/Capture/Arithmetic.class b/APL2.1/TP12/Capture/Arithmetic.class
new file mode 100644
index 0000000..4fbe1cb
Binary files /dev/null and b/APL2.1/TP12/Capture/Arithmetic.class differ
diff --git a/APL2.1/TP12/Capture/Arithmetic.java b/APL2.1/TP12/Capture/Arithmetic.java
new file mode 100644
index 0000000..d4e6994
--- /dev/null
+++ b/APL2.1/TP12/Capture/Arithmetic.java
@@ -0,0 +1,13 @@
+public class Arithmetic {
+    public static void crash() {
+        System.out.println(1 / 0);
+    }
+
+    public static void main(String[] args) {
+        try {
+            crash();
+        } catch (ArithmeticException e) {
+            System.err.println(e);
+        }
+    }
+}
\ No newline at end of file
diff --git a/APL2.1/TP12/Degrés/Degres.class b/APL2.1/TP12/Degrés/Degres.class
new file mode 100644
index 0000000..d1d88b1
Binary files /dev/null and b/APL2.1/TP12/Degrés/Degres.class differ
diff --git a/APL2.1/TP12/Degrés/Degres.java b/APL2.1/TP12/Degrés/Degres.java
new file mode 100644
index 0000000..79c697d
--- /dev/null
+++ b/APL2.1/TP12/Degrés/Degres.java
@@ -0,0 +1,44 @@
+import java.awt.*;
+import javax.swing.*;
+
+public class Degres {
+    public static void main(String[] args) {
+        JFrame f = new JFrame("Degrés !");
+        f.setSize(300, 150);
+        f.setLocation(100, 100);
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        f.setLayout(null);
+
+        JTextField CC = new JTextField();
+        JTextField CF = new JTextField();
+
+        JLabel LC = new JLabel("°C");
+        JLabel LF = new JLabel("°F");
+
+        LC.setSize(20, 20);
+        LF.setSize(20, 20);
+
+        LC.setLocation(230, 30);
+        LF.setLocation(230, 60);
+
+        CC.setSize(200, 20);
+        CF.setSize(200, 20);
+
+        CC.setLocation(20, 30);
+        CF.setLocation(20, 60);
+
+        Observer obs1 = new Observer(false);
+        Observer obs2 = new Observer(true);
+        obs1.setOutputField(CF);
+        obs2.setOutputField(CC);
+
+        CC.addActionListener(obs1);
+        CF.addActionListener(obs2);
+
+        f.add(LC);
+        f.add(LF);
+        f.add(CF);
+        f.add(CC);
+        f.setVisible(true);
+    }
+}
\ No newline at end of file
diff --git a/APL2.1/TP12/Degrés/Observer.class b/APL2.1/TP12/Degrés/Observer.class
new file mode 100644
index 0000000..742fbcb
Binary files /dev/null and b/APL2.1/TP12/Degrés/Observer.class differ
diff --git a/APL2.1/TP12/Degrés/Observer.java b/APL2.1/TP12/Degrés/Observer.java
new file mode 100644
index 0000000..1c33e33
--- /dev/null
+++ b/APL2.1/TP12/Degrés/Observer.java
@@ -0,0 +1,35 @@
+import java.awt.*;
+import javax.swing.*;
+import java.awt.event.*;
+
+public class Observer implements ActionListener {
+    private JTextField outputField;
+    private boolean toDeg;
+
+    public Observer(boolean toDeg) {
+        this.toDeg = toDeg;
+    }
+
+    public void setOutputField(JTextField f) {
+        outputField = f;
+    }
+
+    public void actionPerformed(ActionEvent ev) {
+        try {
+            float temp = Float.parseFloat(ev.getActionCommand());
+            
+            if (toDeg) {
+                temp -= 32f;
+                temp *= 5f/9f;
+            } else {
+                temp *= 9f/5f;
+                temp += 32f;
+            }
+
+            outputField.setText(Float.toString(temp));
+
+        } catch (NumberFormatException ex) {
+            outputField.setText("???");
+        }
+    }
+}
\ No newline at end of file
diff --git a/APL2.1/TP12/Incomplet/Incomplet.class b/APL2.1/TP12/Incomplet/Incomplet.class
new file mode 100644
index 0000000..ac1bd7f
Binary files /dev/null and b/APL2.1/TP12/Incomplet/Incomplet.class differ
diff --git a/APL2.1/TP12/Incomplet/Incomplet.java b/APL2.1/TP12/Incomplet/Incomplet.java
new file mode 100644
index 0000000..8fd2e98
--- /dev/null
+++ b/APL2.1/TP12/Incomplet/Incomplet.java
@@ -0,0 +1,13 @@
+import java.io.*;
+
+public class Incomplet {
+	public static void main(String[] args) {
+        try {
+            byte[] txt = {0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x0D, 0x0A};
+		    System.out.write(txt);
+        } catch (IOException e) {
+            System.err.println(e);
+        }
+		
+	}
+}
\ No newline at end of file
diff --git a/APL2.1/TP12/Plantages/Arithmetic.class b/APL2.1/TP12/Plantages/Arithmetic.class
new file mode 100644
index 0000000..4c37d8b
Binary files /dev/null and b/APL2.1/TP12/Plantages/Arithmetic.class differ
diff --git a/APL2.1/TP12/Plantages/Arithmetic.java b/APL2.1/TP12/Plantages/Arithmetic.java
new file mode 100644
index 0000000..73807ef
--- /dev/null
+++ b/APL2.1/TP12/Plantages/Arithmetic.java
@@ -0,0 +1,5 @@
+public class Arithmetic {
+    public static void main(String[] args) {
+        System.out.println( 1 / 0 );
+    }
+}
\ No newline at end of file
diff --git a/APL2.1/TP12/Plantages/ArrayIndex.class b/APL2.1/TP12/Plantages/ArrayIndex.class
new file mode 100644
index 0000000..3f156f8
Binary files /dev/null and b/APL2.1/TP12/Plantages/ArrayIndex.class differ
diff --git a/APL2.1/TP12/Plantages/ArrayIndex.java b/APL2.1/TP12/Plantages/ArrayIndex.java
new file mode 100644
index 0000000..299c565
--- /dev/null
+++ b/APL2.1/TP12/Plantages/ArrayIndex.java
@@ -0,0 +1,5 @@
+public class ArrayIndex {
+    public static void main(String[] args) {
+        System.out.println(args[args.length]);
+    }
+}
\ No newline at end of file
diff --git a/APL2.1/TP12/Plantages/NullPointer.class b/APL2.1/TP12/Plantages/NullPointer.class
new file mode 100644
index 0000000..7c4cb1c
Binary files /dev/null and b/APL2.1/TP12/Plantages/NullPointer.class differ
diff --git a/APL2.1/TP12/Plantages/NullPointer.java b/APL2.1/TP12/Plantages/NullPointer.java
new file mode 100644
index 0000000..78d9893
--- /dev/null
+++ b/APL2.1/TP12/Plantages/NullPointer.java
@@ -0,0 +1,6 @@
+public class NullPointer {
+    public static void main(String[] args) {
+        String s = null;
+        s.charAt(1);
+    }
+}
\ No newline at end of file
diff --git a/APL2.1/TP12/Plantages/NumberFormat.class b/APL2.1/TP12/Plantages/NumberFormat.class
new file mode 100644
index 0000000..f6d9c7a
Binary files /dev/null and b/APL2.1/TP12/Plantages/NumberFormat.class differ
diff --git a/APL2.1/TP12/Plantages/NumberFormat.java b/APL2.1/TP12/Plantages/NumberFormat.java
new file mode 100644
index 0000000..dfc3646
--- /dev/null
+++ b/APL2.1/TP12/Plantages/NumberFormat.java
@@ -0,0 +1,5 @@
+public class NumberFormat {
+    public static void main(String[] args) {
+        Integer.parseInt("owo");
+    }
+}
\ No newline at end of file
diff --git a/APL2.1/TP12/Plantages/Runtime.class b/APL2.1/TP12/Plantages/Runtime.class
new file mode 100644
index 0000000..0985dee
Binary files /dev/null and b/APL2.1/TP12/Plantages/Runtime.class differ
diff --git a/APL2.1/TP12/Plantages/Runtime.java b/APL2.1/TP12/Plantages/Runtime.java
new file mode 100644
index 0000000..c86c196
--- /dev/null
+++ b/APL2.1/TP12/Plantages/Runtime.java
@@ -0,0 +1,5 @@
+public class Runtime {
+    public static void main(String[] args) {
+        throw new RuntimeException("OwO");
+    }
+}
\ No newline at end of file