java右键菜单

import javax.swing.*;
import java.awt.event.*;
public class Hufan extends JFrame implements MouseListener{
	JMenu fileMenu;
	JPopupMenu jm;
	JMenuItem openFile, closeFile, exit;
	JRadioButtonMenuItem copyFile, pasteFile;
	ButtonGroup bg;
	public static void main(String args[]) {
		new Hufan();
	}
	public Hufan() {
		jm = new JPopupMenu();
		bg = new ButtonGroup();
		// 创建文件菜单及子菜单，并将子菜单添加到文件菜单中
		fileMenu = new JMenu("文件");
		openFile = new JMenuItem("打开");
		closeFile = new JMenuItem("关闭");
		fileMenu.add(openFile);
		fileMenu.add(closeFile);
		jm.add(fileMenu);
		jm.addSeparator();// 添加分割符
		// 创建单选菜单项，并添加到ButtonGroup对象中
		copyFile = new JRadioButtonMenuItem("复制");
		pasteFile = new JRadioButtonMenuItem("粘贴");
		// group 只负责维护组之间的逻辑关系
		bg.add(copyFile);
		bg.add(pasteFile);
		jm.add(copyFile);
		jm.add(pasteFile);
		jm.addSeparator();
		exit = new JMenuItem("退出");
		jm.add(exit);
		// 创建监听器对象
		this.addMouseListener(this);// 向主窗口注册监听器
		this.setTitle("弹出式菜单的简单使用");
		this.setSize(400, 300);
		this.setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	public void mouseClicked(MouseEvent e) {}
	public void mouseEntered(MouseEvent e) {}
	public void mouseExited(MouseEvent e) {}
	public void mouseReleased(MouseEvent e) {} 
	public void mousePressed(MouseEvent e) {
		if(e.getButton()==3){
			jm.show(e.getComponent(), e.getX(), e.getY());
		}
	}
}


import javax.swing.*;
import java.awt.event.*;
public class Hufan extends JFrame implements MouseListener{
	JMenu fileMenu;
	JPopupMenu jm;
	JMenuItem openFile, closeFile, exit;
	JRadioButtonMenuItem copyFile, pasteFile;
	ButtonGroup bg;
	public static void main(String args[]) {
		new Hufan();
	}
	public Hufan() {
		jm = new JPopupMenu();
		bg = new ButtonGroup();
		// 创建文件菜单及子菜单，并将子菜单添加到文件菜单中
		fileMenu = new JMenu("文件");
		openFile = new JMenuItem("打开");
		closeFile = new JMenuItem("关闭");
		fileMenu.add(openFile);
		fileMenu.add(closeFile);
		jm.add(fileMenu);
		jm.addSeparator();// 添加分割符
		// 创建单选菜单项，并添加到ButtonGroup对象中
		copyFile = new JRadioButtonMenuItem("复制");
		pasteFile = new JRadioButtonMenuItem("粘贴");
		// group 只负责维护组之间的逻辑关系
		bg.add(copyFile);
		bg.add(pasteFile);
		jm.add(copyFile);
		jm.add(pasteFile);
		jm.addSeparator();
		exit = new JMenuItem("退出");
		jm.add(exit);
		// 创建监听器对象
		this.addMouseListener(this);// 向主窗口注册监听器
		this.setTitle("弹出式菜单的简单使用");
		this.setSize(400, 300);
		this.setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	public void mouseClicked(MouseEvent e) {}
	public void mouseEntered(MouseEvent e) {}
	public void mouseExited(MouseEvent e) {}
	public void mouseReleased(MouseEvent e) {} 
	public void mousePressed(MouseEvent e) {
		if(e.getButton()==3){
			jm.show(e.getComponent(), e.getX(), e.getY());
		}
	}
}