AWT Ampel

import java.awt.*;
import java.awt.event.*;

/**
  *
  * Beschreibung
  *
  * @version 1.0 vom 22.05.2015
  * @author
  */

public class Ampel extends Frame {
  // Anfang Attribute
  // Ende Attribute

  public Ampel(String title) {
    // Frame-Initialisierung
    super(title);
    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent evt) { dispose(); }
    });
    addMouseListener(new MyMouseListener());
    int frameWidth = 567;
    int frameHeight = 357;
    setSize(frameWidth, frameHeight);
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    int x = (d.width - getSize().width) / 2;
    int y = (d.height - getSize().height) / 2;
    setLocation(x, y);
    setResizable(false);
    // Anfang Komponenten

    // Ende Komponenten

    setVisible(true);
  } // end of public Ampel

  // Anfang Methoden

  public static void main(String[] args) {
    new Ampel("Ampel");
  } // end of main

  public boolean redClicked = false;
  public boolean yellowClicked = false;
  public boolean greenClicked = false;

  public int xPos = 0;
  public int yPos = 0;

  public void paint(Graphics g){
    g.drawRect(50,50,50,50);
    g.drawRect(50,110,50,50);
    g.drawRect(50,170,50,50);
    g.setFont(new Font("Haettenschweiler",Font.PLAIN,20));
    if (redClicked) {
      g.setColor(Color.red);
      g.fillRect(110,50,50,50);
      g.setColor(Color.black);
      g.drawString("Rot",110 + 3,50+25);
    }
    if (yellowClicked) {
      g.setColor(Color.yellow);
      g.fillRect(110,110,50,50);
      g.setColor(Color.black);
      g.drawString("Gelb",110 + 3,110+25);
    }
    if (greenClicked) {
      g.setColor(Color.green);
      g.fillRect(110,170,50,50);
      g.setColor(Color.black);
      g.drawString("Grün",110 + 3,170+25);
    }
  }

  public class MyMouseListener extends MouseAdapter{
    public void mouseClicked(MouseEvent event){
      xPos = event.getX();
      yPos = event.getY();
      if ((xPos > 50) && (xPos < 50+50)) {
        if ((yPos > 50) && (yPos < 50+50)) {
          redClicked = true;
        }
        else{
          redClicked = false;
        }
        if ((yPos > 110) && (yPos < 110+50)) {
          yellowClicked = true;
        }
        else{
          yellowClicked = false;
        }
        if ((yPos > 170) && (yPos < 170+50)) {
          greenClicked = true;
        }
        else{
          greenClicked = false;
        }
      }
      else{
        redClicked = false;
        yellowClicked = false;
        greenClicked = false;
      }
      repaint();
    }
    public void mouseMoved(MouseEvent event){
      xPos = event.getX();
      yPos = event.getY();
      System.out.println(xPos);
      repaint();
    }
  }


  // Ende Methoden
} // end of class Ampel