jcheckbox2.java

《精通Java Swing程序设计S》这本书所附带的JAVA程序写得很漂亮,都是SWING的实例子,很适合初学者。

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

public class JCheckBox2 implements ItemListener
{
    JFrame f = null;
    JCheckBox c4 = null;
    JCheckBox c5 = null;
    
    JCheckBox2(){
        f = new JFrame("JCheckBox");
        Container contentPane = f.getContentPane();
        contentPane.setLayout(new GridLayout(2,1));
        JPanel p1 = new JPanel();
        p1.setLayout(new GridLayout(1,3));
        p1.setBorder(BorderFactory.createTitledBorder("您最喜欢哪一家速食店呢？")); 
        JCheckBox c1 = new JCheckBox("麦当劳");
        JCheckBox c2 = new JCheckBox("肯德鸡");
        JCheckBox c3 = new JCheckBox("21世纪");
        p1.add(c1);
        p1.add(c2);
        p1.add(c3);
        JPanel p2 = new JPanel();
        p2.setLayout(new GridLayout(2,1));
        p2.setBorder(BorderFactory.createTitledBorder("您喜欢哪种程序语言，喜欢的请打勾：")); 
        c4 = new JCheckBox("JAVA",new ImageIcon(".\\icons\\x.jpg"));
        c5 = new JCheckBox("C++",new ImageIcon(".\\icons\\x.jpg"));
        c4.addItemListener(this);
        c5.addItemListener(this);
        p2.add(c4);
        p2.add(c5);
        contentPane.add(p1);
        contentPane.add(p2);
        f.pack();
        f.show();
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                    System.exit(0);
            }
        });
    }
    
    public void itemStateChanged(ItemEvent e)
    {
        if (e.getStateChange() == e.SELECTED)
        {
            if(e.getSource() == c4)
                c4.setIcon(new ImageIcon(".\\icons\\r.jpg"));
            if(e.getSource() == c5)
                c5.setIcon(new ImageIcon(".\\icons\\r.jpg"));
            
        }
        else
        {
            if(e.getSource() == c4)
                c4.setIcon(new ImageIcon(".\\icons\\x.jpg"));
            if(e.getSource() == c5)
                c5.setIcon(new ImageIcon(".\\icons\\x.jpg"));
        }
    }
      
    public static void main(String args[])
    {
        new JCheckBox2();
    }
}