MouseDragged doesn't seem to be working

[john price]

I'm trying to learn about mouseDragged. Here is my code:

import java.awt.*;
import java.awt.Color.*;
import java.awt.event.*;
import java.awt.geom.*;

import javax.swing.*;
import javax.swing.Timer;

final public class Ball extends JPanel implements ActionListener, MouseListener, KeyListener, MouseMotionListener {

    //double instead of Double
    //boolean instead of Boolean
    double q = 40.00;
    double w = 300.00;
    double t = 300.00;
    double z = 40.00;
    Timer timer;
    boolean direction = false;
    boolean start = false;

    public Ball() {
	this.setFocusable(true);
        //timer = new Timer(20, this);
        //timer.start();
	this.setBackground(Color.BLUE);
	this.addMouseListener(this); 
	this.addKeyListener(this);
    }
	public void mouseDragged(MouseEvent me) {
	int x = me.getX();
	int y = me.getY();
	System.out.println("x = " + x);
	System.out.println("y = " + y);
	}
	public void mouseMoved(MouseEvent me) {}
	public void mousePressed(MouseEvent me) { 
        	//if (direction) {
		//direction = false;
		//}
		//else {
		//direction = true;
		//}
          	}
    public void mouseReleased(MouseEvent e) {
    }
    public void mouseEntered(MouseEvent e) {
    }
    public void mouseExited(MouseEvent e) {
    }
    public void mouseClicked(MouseEvent e) {
    }
	public void keyPressed(KeyEvent e) {
	//switch(e.getKeyCode()) {
	//case KeyEvent.VK_LEFT : direction = false; repaint(); break;
	//case KeyEvent.VK_RIGHT : direction = true; repaint(); break;
	//}
	}
	public void keyTyped(KeyEvent e) {
	}
	public void keyReleased(KeyEvent e) {
	}
    protected void paintComponent (Graphics g) {
        super.paintComponent(g);//removes all previously drawn content and draw from scratch
        Graphics2D g2 = (Graphics2D) g;
        Ellipse2D ellipse = new Ellipse2D.Double(w, t, q, z); //x, y, width, height
        g2.setColor(Color.RED);
        g2.fill(ellipse);

	//Rectangle2D rec = new Rectangle2D.Double(q, w, e, r);
	//g2.draw(rec);
	//Line2D lin = new Line2D.Double(q - 20, w - 20, e - 20, r - 20);
	//g2.draw(lin);
	//g.setColor(Color.yellow);
	//Font b=new Font("TimesRoman",Font.PLAIN,45);
	//g.setFont(b);
	//g.drawString("HI", 10, 40);
    }

    public void actionPerformed(ActionEvent ex) {
    }

   final public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setTitle("ball");
        frame.setSize(600, 500);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	//frame.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
        Container contentPane = frame.getContentPane();
        contentPane.add(new Ball());
	frame.setResizable(false);
        frame.setVisible(true);
    }
}

Output:

I obviously am supposed to get some system.out.println's, and there is no system output. What is wrong?
Thanks,
cc11rocks

[Darryl Burke]

The only listeners you added are MouseListener and KeyListener. mouseDragged isn't a part of either.

[john price]

Darryl Burke wrote:The only listeners you added are MouseListener and KeyListener. mouseDragged isn't a part of either.

Thank you very much!
Solution add:

this.addMouseMotionListener(this);

Thanks,
cc11rocks

[Stephan van Hulst]

It's more difficult to make mistakes like that if you make anonymous listeners, like I advised you before.

In any case, you should never have a JPanel also implement listener classes. It's very poor form.