randomexample.java

很好得jbuilder100例源代码

package untitled1;

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

public class randomexample extends Applet {
  int i,j,k;
  int x,y;
  Color mycolor;
  boolean isStandalone = false;
  /**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 randomexample() {
  }
  /**Initialize the applet*/
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception {
    this.addMouseListener(new java.awt.event.MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        this_mouseClicked(e);
      }
    });
  }
  /**Get Applet information*/
  public String getAppletInfo() {
    return "Applet Information";
  }
  /**Get parameter info*/
  public String[][] getParameterInfo() {
    return null;
  }

  void this_mouseClicked(MouseEvent e) {
     x = e.getX() ;
     y = e.getY() ;
     i = (int)(255*Math.random());
     j = (int)(255*Math.random());
     k = (int)(255*Math.random());
     repaint();
  }
  public void paint(Graphics g){
     mycolor = new Color(i,j,k);
     g.setColor(mycolor);
     g.fillOval(x-10,y-10,20,20);
   }
  public void update(Graphics g){
     paint(g);
  }
}