Java——复选框：JCheckBox

import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
 
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
 
//=================================================
// File Name       :	JCheckBox_demo
//------------------------------------------------------------------------------
// Author          :	Common
 
// 类名：JCheckBox
// 属性：
// 方法：
class MyCheckBox implements ItemListener{
	private JFrame frame = new JFrame("窗体");
	private Container cont = frame.getContentPane();
	private JCheckBox jrb1  = new JCheckBox("单选1");
	private JCheckBox jrb2  = new JCheckBox("单选2");
	private JCheckBox jrb3  = new JCheckBox("单选3");
	private JPanel pan = new JPanel();
	public MyCheckBox(){
		//定义一个面板的边框显示条
		pan.setBorder(BorderFactory.createTitledBorder("请选择按钮"));
		pan.setLayout(new GridLayout(1,3));
 
		pan.add(this.jrb1);
		pan.add(this.jrb2);
		pan.add(this.jrb3);
 
		jrb1.addItemListener(this); 			//加入事件监听
		jrb2.addItemListener(this); 			//加入事件监听
		jrb3.addItemListener(this); 			//加入事件监听
 
		cont.add(pan);
		this.frame.setSize(330,80);
		this.frame.setVisible(true);
		this.frame.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e) {			//窗口关闭时触发，按下关闭按钮
			// TODO 自动生成的方法存根
			System.out.println("windowClosing-->窗口关闭");
			System.exit(1);
			}
		});
	}
	@Override
	public void itemStateChanged(ItemEvent e) {
		// TODO 自动生成的方法存根
		if(jrb1.isSelected()){
			System.out.println("jrb1");
		}
		if(jrb2.isSelected()){
			System.out.println("jrb2");
		}
		if(jrb3.isSelected()){
			System.out.println("jrb3");
		}
	}
}
 
//主类
//Function        : 	JCheckBox_demo
public class JCheckBox_demo {
 
	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		new MyCheckBox();
	}
 
}