jappletwithbuttons.java

Java程序设计技巧与开发实例附书源代码。

import java.net.*;
import java.awt.event.*;
import java.awt.FlowLayout;
import javax.swing.*;

public class JAppletWithButtons
        extends JApplet
        implements ActionListener {
    JButton windLook = new JButton("Windows");
    JButton unixLook = new JButton("Unix");
    JButton javaLook = new JButton("Java");
    JLabel label = new JLabel("Welcome to Swing", SwingConstants.CENTER);

    public void init() {
        try {
            URL windURL = new URL(getCodeBase(), "Icons/windows.gif");
            URL unixURL = new URL(getCodeBase(), "Icons/xwin.gif");
            URL javaURL = new URL(getCodeBase(), "Icons/java.gif");
            URL newURL = new URL(getCodeBase(), "Icons/new.gif");
            windLook.setIcon(new ImageIcon(windURL));
            unixLook.setIcon(new ImageIcon(unixURL));
            javaLook.setIcon(new ImageIcon(javaURL));
            label.setIcon(new ImageIcon(newURL));
        }
        catch (MalformedURLException murle) {
            System.err.println("Error loading button images: " + murle);
        }
        getContentPane().setLayout(new FlowLayout());
        getContentPane().add(label);
        getContentPane().add(windLook);
        getContentPane().add(unixLook);
        getContentPane().add(javaLook);
    }

    public void actionPerformed(ActionEvent ae) {
    /* whatever should happen if the buttons are pressed */}
}