A sample, please

[Gaia2000]

could someone please just show me a code of an applet that would do nothing but have a small ball on the screen, and make it move left when the left arrow key is pushed? thanks in advance

[sjalle]

This applet can be run as an application also.

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.swing.*;

/**
 *
 */

public class ButtonBall extends JApplet implements KeyListener {
  private boolean isStandalone = false;
  public final static int STEP=5;
  public final static Dimension DIM=new Dimension(20,20);
  private Point p=null;
  //Construct the applet
  public ButtonBall() {
  }
  //Initialize the applet
  public void init() {
    try {
      jbInit();
      addKeyListener(this);
      p=new Point(getWidth()/2 - DIM.width/2,
                  getHeight()/2 - DIM.height/2);
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**
   * Get focus here to catch the key events
   */
  public void start() {
    requestFocus();
  }
  //Component initialization
  private void jbInit() throws Exception {
    this.setSize(new Dimension(400,300));
  }
  public void paint (Graphics g) {
    Color c=g.getColor();
    g.setColor(Color.WHITE);
    g.fillRect(0,0,getWidth(),getHeight());
    g.setColor(Color.black);
    g.drawString("("+p.x+","+p.y+")",10,15);
    g.setColor(Color.RED);
    g.fillOval(p.x,p.y,DIM.width, DIM.height);
    g.setColor(c);
  }
  //Main method
  public static void main(String[] args) {
    ButtonBall applet = new ButtonBall();
    applet.isStandalone = true;
    JFrame frame = new JFrame();
    //EXIT_ON_CLOSE == 3
    frame.setDefaultCloseOperation(3);
    frame.setTitle("ButtonBall");
    frame.getContentPane().add(applet, BorderLayout.CENTER);
    applet.init();
    applet.start();
    frame.setSize(400,320);
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    frame.setLocation((d.width - frame.getSize().width) / 2, (d.height - frame.getSize().height) / 2);
    frame.setVisible(true);
  }
  /**
   * Handle keypressed
   * @param e
   */
  public void keyPressed(KeyEvent e) {
    switch (e.getKeyCode()) {
      case KeyEvent.VK_LEFT:
        p.x -= STEP;
        repaint();
        break;
      case KeyEvent.VK_RIGHT:
        p.x += STEP;
        repaint();
        break;
      case KeyEvent.VK_UP:
        p.y -= STEP;
        repaint();
        break;
      case KeyEvent.VK_DOWN:
        p.y += STEP;
        repaint();
        break;
    }
  }
  public void keyTyped(KeyEvent e) {}
  public void keyReleased(KeyEvent e) {}
}

[Gaia2000]

yes, exactly, and thanks very much