看看这个题．

Question

单击按扭，按扭表现为凹下去的形状，且标签文字会改变，再单击该按扭（Jtogglebutton）时，按扭弹起，标签(Jlable)上的文字又回到原来的内容

Answer 1

private int ToggleCount = 1;
private JToggleButton jToggleButton = new JToggleButton("jToggleButton");
jToggleButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
ToggleCount++;
if(ToggleCount%2==0)jToggleButton.setLabel("AlreadyEnter");
else jToggleButton.setLabel("JToggleButton");
}
});

Answer 2

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;public class ToggleTest extends JFrame {

private Container container;
private int ToggleCount = 1;
private JToggleButton jToggleButton = new JToggleButton("jToggleButton");

public ToggleTest() {
super("ToggleTest");

container = getContentPane();
container.setLayout(new BorderLayout());
container.add(jToggleButton,BorderLayout.CENTER);

jToggleButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
ToggleCount++;
if(ToggleCount%2==0)jToggleButton.setLabel("AlreadyEnter");
else jToggleButton.setLabel("jToggleButton");

}
});

addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
dispose();
System.exit(0);
}
});
}

public static void main(String args[]) { System.out.println("Starting ToggleTest..."); ToggleTest mainFrame = new ToggleTest();
Toolkit kit = Toolkit.getDefaultToolkit();
Dimension screenSize = kit.getScreenSize();
int screenWidth = screenSize.width;
int screenHeight = screenSize.height;
mainFrame.setLocation(screenWidth/4,screenHeight/4);
mainFrame.setSize(400, 400);
mainFrame.setVisible(true);
}
}