swing-4-复选框

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

public class test extends JApplet
implements ItemListener{
    JTextField jtf;
    public void init(){
        Container contentPane = getContentPane();
        contentPane.setLayout(new FlowLayout());
    
        ImageIcon a1 = new ImageIcon("D:/data/Images/6.gif");
        ImageIcon a2 = new ImageIcon("D:/data/Images/7.gif");
        ImageIcon a3 = new ImageIcon("D:/data/Images/8.gif");
        
        JCheckBox cb = new JCheckBox("C", a1);
        cb.setRolloverIcon(a2);
        cb.setSelectedIcon(a3);
        cb.addItemListener(this);
        contentPane.add(cb);
        
        cb = new JCheckBox("C++", a1);
        cb.setRolloverIcon(a2);
        cb.setSelectedIcon(a3);
        cb.addItemListener(this);
        contentPane.add(cb);
        
        cb = new JCheckBox("java", a1);
        cb.setRolloverIcon(a2);
        cb.setSelectedIcon(a3);
        cb.addItemListener(this);
        contentPane.add(cb);
        
        jtf = new JTextField(15);
        contentPane.add(jtf);
        
    }
    public void itemStateChanged(ItemEvent ie){
        JCheckBox cb = (JCheckBox)ie.getItem();
        jtf.setText(cb.getText());
    }

}