ch8_e8_31.java

来自「清华的Java程序」· Java 代码 · 共 42 行

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

public class ch8_e8_31 extends Applet implements ActionListener
{
    TextField inputURLTfd = new TextField(20);
    Image myImage ;
    public void init()
    {
        add(inputURLTfd);
        inputURLTfd.addActionListener(this);
    }
    public void paint(Graphics g)
    {
        if(myImage != null)
            g.drawImage(myImage,100,100,this);
    }
    public void actionPerformed(ActionEvent ae)
    {
        if(ae.getSource() == inputURLTfd)
        {
            String str = inputURLTfd.getText().trim();
            System.out.println(str.substring(
                str.length()-4,str.length()) + ".");
            if(str.length()>4 && str.substring(
                str.length()-4,str.length()).equals(".gif"))
            {
                System.out.println("match");
                myImage = getImage(getDocumentBase(),str);
                repaint();
            }
            else if(str.length()>3 && str.substring(
                str.length()-3,str.length()).equals(".au"))
            {
                getAudioClip(getDocumentBase(),str).play();
            }
        }
    }
}