好像也不是这个问题。下面这个例子，我是想实现我点击那个按钮，就打印一个相应的数字1或2，但是如果是监听两个按钮的话，那么不管按哪一个按钮，一次都会打印两个数字；而如果是只监听一个按钮的或，就会出现不管按那个按钮，就只打印一种数字。你试试看
import java.awt.GridLayout;
import java.io.File;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import javax.swing.JTextArea;
import java.awt.event.WindowListener ;
import java.awt.event.WindowAdapter ;
import java.awt.event.WindowEvent ;
import javax.swing.JPanel;
import javax.swing.*;
import java.awt.Container ;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup ;
import java.awt.event.ItemListener ;
import java.awt.event.ItemEvent ;
import javax.swing.ImageIcon ;
import java.awt.Color ;
class MyRadioButtonHandle implements ItemListener{
private JFrame jFrame= new JFrame("Hello World");
private Container cont = jFrame.getContentPane();
private JRadioButton jrb1 = new JRadioButton("男");
private JRadioButton jrb2 = new JRadioButton("女");
private JPanel jPanel= new JPanel();
private ButtonGroup buttonGroup = new ButtonGroup() ;
public MyRadioButtonHandle(){
jPanel.setBorder(BorderFactory.createTitledBorder("请选择性别")) ;
jPanel.setLayout(new GridLayout(1,3));
jPanel.add(jrb1);
jPanel.add(jrb2);
buttonGroup.add(jrb1);
buttonGroup.add(jrb2);
jrb1.addItemListener(this);//监听事件
jrb2.addItemListener(this);
cont.add(jPanel);
this.jFrame.setSize(400,300);
this.jFrame.pack();
this.jFrame.setLocation(300,300);
this.jFrame.setVisible(true);
this.jFrame.addWindowListener(new WindowAdapter(){
public void WindowClosing(WindowEvent e){
System.exit(1);
}
});
}
public void itemStateChanged(ItemEvent e) {
if(e.getItem() == jrb1){
System.out.println("1");//选择jrb1就打印1
jrb1.setForeground(Color.RED);
jrb2.setForeground(Color.black);
}else{
System.out.println("2");
jrb1.setForeground(Color.black);
jrb2.setForeground(Color.BLUE);
}
}
}
public class JRadioButtonDemo{
public static void main(String args[]){
new MyRadioButtonHandle();
}
}
