key.java

很好得jbuilder100例源代码

package untitled2;

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

public class key extends Applet {
  int x = 150,y = 150;
  boolean isStandalone = false;
  BorderLayout borderLayout1 = new BorderLayout();
  Panel panel1 = new Panel();
  /**Get a parameter value*/
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }

  /**Construct the applet*/
  public key() {
  }
  /**Initialize the applet*/
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception {
    this.setLayout(borderLayout1);
    panel1.addKeyListener(new java.awt.event.KeyAdapter() {
      public void keyPressed(KeyEvent e) {
        panel1_keyPressed(e);
      }
    });
    this.add(panel1, BorderLayout.CENTER);
  }
  /**Get Applet information*/
  public String getAppletInfo() {
    return "Applet Information";
  }
  /**Get parameter info*/
  public String[][] getParameterInfo() {
    return null;
  }

  void panel1_keyPressed(KeyEvent e) {
        panel1.getGraphics().clearRect(0,0,300,300);
    if (e.getKeyCode() == e.VK_LEFT)
       x -= 1;
    if (e.getKeyCode() == e.VK_RIGHT)
       x += 1;
    if (e.getKeyCode() == e.VK_UP)
       y -= 1;
    if (e.getKeyCode() == e.VK_DOWN)
       y += 1;
    panel1.getGraphics().fillOval(x,y,15,15);
  }
}