boombutton.java

java经典小程序!适合初学者参考与学习之用!

// BoomButton
// by Patrick Killelea ([e-mail], http://challenger.neog.com/~patrick/)
// Thanks to Elijah Dean Meeker (http://www.realtime.net/~elijah/) and
// thanks to Sean E. Russell, University of Oregon for pieces of their
// applet code and gifs. Thanks to Steve Tomljenovic ([e-mail])
// for MediaTracker tip.
// Also thanks to http://sunsite.sut.ac.jp/multimed/sounds/sound_effects/
// for the explosion sound.

// Please report bugs and improvement suggestions to [e-mail].

import java.awt.*;
import java.net.URL;
import java.net.MalformedURLException;
import java.lang.InterruptedException;
import java.applet.Applet;
import java.applet.AudioClip;

public class BoomButton extends java.applet.Applet implements Runnable {

  private Image img[] = new Image[6];
  public int state = 0;
  private AudioClip clip1;
  Thread anim;
  Button goButton=null;
  String button_text;

/****************************STATE CHANGES*************************************/
  public void init(){
    MediaTracker tracker = new MediaTracker(this);
    button_text = getParameter("button_text");
    goButton = new Button(button_text);
    add(goButton);

    clip1 = getAudioClip(getCodeBase(), "sounds/Explosion-3.au");
    img[0] = getImage(getDocumentBase(), "images/home2.gif");
    tracker.addImage(img[0], 0);
    img[1] = getImage(getDocumentBase(), "images/bang1.gif");
    tracker.addImage(img[1], 0);
    img[2] = getImage(getDocumentBase(), "images/puff1.gif");
    tracker.addImage(img[2], 0);
    img[3] = getImage(getDocumentBase(), "images/puff2.gif");
    tracker.addImage(img[3], 0);
    img[4] = getImage(getDocumentBase(), "images/puff3.gif");
    tracker.addImage(img[4], 0);
    img[5] = getImage(getDocumentBase(), "images/puff4.gif");
    tracker.addImage(img[5], 0);

    Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
    try { tracker.waitForAll(); }
    catch (InterruptedException e) {
      System.out.println("Interrupted while loading images.");
      System.exit(0);
    }
    Thread.currentThread().setPriority(Thread.NORM_PRIORITY);

  } // end init

  public void start(){
    anim=null;
    repaint();
  }//end start

  public void stop(){
    if (anim!=null) {
      anim.stop();
      anim=null;
    }
  }//end stop

  public void destroy(){
  }//end destroy
 /****************************END STATE CHANGES********************************/
 /*******************************EVENTS****************************************/
 
  public boolean action(Event evt, Object obj) {
    if (obj.equals(button_text)) {
      anim = new Thread(this);
      anim.start();
      //goButton=null;
      removeAll();
      return(true);
    }
    return false;
  }

  public boolean mouseDown(Event f, int x, int y){
    //anim = new Thread(this);
    //anim.start();
    add(goButton);
    return(true);
  }//end mouseDown

  public boolean mouseUp(Event e, int x, int y){
        return(true);
  }//end mouseUp

  public boolean mouseMove(Event e, int x, int y){
        showStatus("");
        return(true);
  }//end mouseEnter

  public boolean mouseEnter(Event e, int x, int y){
        showStatus(""); // Try to hide that this is an applet.
        return(true);
  }//end mouseEnter

  public boolean mouseExit(Event e, int x, int y){
        return(true);
  }//end mouseExit

/*******************************END EVENTS*************************************/
/*******************************METHODS****************************************/

  public void paint(Graphics g){
    switch (state)
      {
      case 0:
        //g.drawImage(img[0], 0, 0, this);
        break;
      case 1:                   // Explode 1 (Flash)
        g.drawImage(img[1], 0, 0, this);
        break;
      case 2:                   // Explode 2 (Smoke)
        g.drawImage(img[2], 0, 0, this);
        break;
      case 3:                   // Explode 3
        g.drawImage(img[3], 0, 0, this);
        break;
      case 4:                   // Explode 4
        g.drawImage(img[4], 0, 0, this);
        break;
      case 5:                   // Explode 5
        g.drawImage(img[5], 0, 0, this);
        break;
      } // switch
  } // end paint

  public void run() {
    //    repaint();
    if (clip1 != null) clip1.play();
        for (state=1; state<=5; state++) {
          repaint();
          try {anim.sleep(75);}
          catch (InterruptedException e){}
        } // for
	state=0;
	repaint();
  }

/*****************************END METHODS**************************************/

}//end class BoomButton