changeimg.java~20~

Jbuilder100个例子 都是经典例子 对大家学习Jbuilder非常有帮助

package untitled1;

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

public class changeImg extends java.applet.Applet implements Runnable{
  Image myImg;
  boolean flag = true;
  double i = 0.1;
  Thread runner;
  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);
  }


  public void start(){
   if(runner==null){
      runner=new Thread(this);
      runner.start();
      }
  }
  public void stop(){
   if(runner!=null){
       runner.stop();
       runner=null;
   }
  }
   public void run(){
      while(true){
        repaint();
        try{
           Thread.sleep(200); }
        catch(InterruptedException e){}
      }
   }
   public void paint(Graphics g){
     if (i >= 2.5)
        flag = false;
     if (i <= 0.1)
        flag = true;
     if (flag == true)
        i += 0.1;
     else
        i -= 0.1;
     int x = myImg.getWidth(this);
     int y = myImg.getHeight(this);
     g.drawImage(myImg,(150-(int)((x*i)/2)),(150-(int)((y*i)/2)),(int)(x*i),(int)(y*i),this);
   }

  /**Construct the applet*/
  public changeImg() {
  }
  /**Initialize the applet*/
  public void init() {
    myImg=getImage(getCodeBase(),"qingchengshan1.jpg");
    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;
  }
}