randompic.java~6~

很好得jbuilder100例源代码

package untitled2;

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

public class randompic extends java.applet.Applet implements Runnable {
  boolean isStandalone = false;
  Thread runner = null;
  Color mycolor;
  int ndraw;
  /**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 randompic() {
  }
  /**Initialize the applet*/
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception {
  }
  /**Get Applet information*/
  public String getAppletInfo() {
    return "Applet Information";
  }
  /**Get parameter info*/
  public String[][] getParameterInfo() {
    return null;
  }

  public void start(){
     if(runner==null){
        runner=new Thread(this);
        runner.start();
     }
  }
  public void stop(){
     if(runner!=null){
         runner.stop();
         runner=null;
     }
  }

  public int draw(){
     ndraw = (int)(4 * Math.random());
     return ndraw;
  }

  public void run(){
      while(true){
        repaint();
        try{
           Thread.sleep(200); }
        catch(InterruptedException e){}
      }
   }

   public void paint(Graphics g){
      int x = (int)(300 * Math.random());
      int y = (int)(300 * Math.random());
      int r = (int)(255 * Math.random());
      int g1 = (int)(255 * Math.random());
      int b = (int)(255 * Math.random());
      mycolor = new Color(r,g1,b);
      g.setColor(mycolor);
      switch (draw()){
          case 0:
              g.fillOval(x,y,10,10);
          case 1:
              g.fillRect(x,y,10,10);
          case 2:
              g.fillRoundRect(x,y,10,10,5,5);
          case 3:
              g.fillOval(x,y,10,20);
       }
   }
   public void update(Graphics g){
      paint(g);
   }
}