package multimediademo;import java.awt.*;import java.awt.event.*;import java.applet.*;import java.net.*;import java.awt.image.*;import multimediademo.ImageFilter;import javax.swing.*;import com.borland.jbcl.layout.*;/** * <p>Title: </p> * <p>Description: </p> * <p>Copyright: Copyright (c) 2003</p> * <p>Company: </p> * @author not attributable * @version 1.0 */public class AppletDemo extends Applet implements Runnable{  private boolean isStandalone = false;  //變量申明  private URL m_imageURL;            //圖像的URL  private String m_imageName;        //圖像文件的名稱  Image sourceImage,filteredImage;    //圖像類變量  ImageFilter imageFilter;            //申明一個(gè)圖像過濾器  MediaTracker tracker;               //定義媒體跟蹤器  Thread thread = new Thread();  XYLayout xYLayout1 = new XYLayout();  JButton jButton1 = new JButton();      //定義一個(gè)空線程  //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 AppletDemo() {  }  //重載的構(gòu)造函數(shù)/*  public AppletDemo(URL imageURL,String imageName){    m_imageURL = imageURL;    m_imageName = imageName;  }*/  //Initialize the applet  public void init() {    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  //Component initialization  private void jbInit() throws Exception {    sourceImage = this.getImage(m_imageURL,m_imageName);    filteredImage = sourceImage;    ImageFilter imageFilter = new ImageFilter();    jButton1.addActionListener(new AppletDemo_jButton1_actionAdapter(this));    this.add(jButton1,  new XYConstraints(55, 16, 42, 19));  }  //Get Applet information  public String getAppletInfo() {    return "Applet Information";  }  //Get parameter info  public String[][] getParameterInfo() {    return null;  }  //定義paint函數(shù)  public void paint(Graphics g){    if(!tracker.checkAll(true)){      this.showStatus("Now,the images are loading...");    }    else{      this.showStatus("Loading images is over");      g.drawImage(filteredImage,50,50,150,150,this);    }  }  //線程開始函數(shù)  public void start(){    if(thread == null){      thread = new Thread(this,"DemoThread");      thread.start();    }  }  //Overriding stop function  public void stop(){    if(thread != null){      thread.stop();      thread = null;    }  }  //Overriding destroy function  public void destroy(){  }  //Overriding run function  public void run(){    while(true){      imageFilter.pixelValueChange();      filteringImage();      repaint();      try{        Thread.sleep(200);      }      catch(InterruptedException e)      {}    }  }  //定義過慮  private void filteringImage(){    ImageProducer producer = sourceImage.getSource();    producer = new FilteredImageSource(producer,imageFilter);    filteredImage = this.createImage(producer);    tracker.addImage(filteredImage,1);  }  void jButton1_actionPerformed(ActionEvent e) {    JFileChooser imageChooser = new JFileChooser();    int returnVal = imageChooser.showOpenDialog(this);    if(returnVal == JFileChooser.APPROVE_OPTION){      try {        m_imageURL = imageChooser.getSelectedFile().toURL();        m_imageName = imageChooser.getSelectedFile().getName();        thread = new Thread;        thread.start();      }      catch (MalformedURLException ex) {}    }  }}class AppletDemo_jButton1_actionAdapter implements java.awt.event.ActionListener {  AppletDemo adaptee;  AppletDemo_jButton1_actionAdapter(AppletDemo adaptee) {    this.adaptee = adaptee;  }  public void actionPerformed(ActionEvent e) {    adaptee.jButton1_actionPerformed(e);  }}