Java Swing 界面菜单栏使用案例 JMenu JMenuBar

package 简单文件管理系统;

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

	public class Test{
	    public static void main(String args[]){
	    	
	    	//创建主窗口
	        JFrame frame = new JFrame("简单文件系统");

	        //创建菜单栏
	        JMenuBar menuBar = new JMenuBar();
	        frame.setJMenuBar(menuBar);

	        //创建一级菜单
	        JMenu menuFile = new JMenu("文件操作"), menuDirectory = new JMenu("目录操作"), menuInformation = new JMenu("系统信息");
	        menuBar.add(menuFile);
	        menuBar.add(menuDirectory);
	        menuBar.add(menuInformation);

	        //添加“文件操作”菜单下的二级菜单
	        JMenu itemCreate = new JMenu("新建文件");
	        JMenu itemInformation = new JMenu("查看属性");
	        JMenu itemDelete = new JMenu("删除文件");
	        menuFile.add(itemCreate);
	        menuFile.add(itemInformation);
	        menuFile.add(itemDelete);

	        //添加“系统信息”菜单下的二级菜单
	        JMenu itemList = new JMenu("文件列表");
	        JMenu itemGraph = new JMenu("位示图情况");
	        menuInformation.add(itemList);
	        menuInformation.add(itemGraph);

	        //添加“目录操作”菜单下的二级菜单
	        JMenu itemNewDirectory = new JMenu("创建目录");
	        JMenu itemSetDirectory = new JMenu("设置目录");
	        menuDirectory.add(itemNewDirectory);
	        menuDirectory.add(itemSetDirectory);
	        
	        //设置二级菜单点击事件
	        itemCreate.addMouseListener(new MouseListener() {
				
				@Override
				public void mouseReleased(MouseEvent e) {
					// TODO Auto-generated method stub
					
				}
				
				@Override
				public void mousePressed(MouseEvent e) {
					// TODO Auto-generated method stub
					
				}
				
				@Override
				public void mouseExited(MouseEvent e) {
					// TODO Auto-generated method stub
					
				}
				
				@Override
				public void mouseEntered(MouseEvent e) {
					// TODO Auto-generated method stub
					
				}
				
				@Override
				public void mouseClicked(MouseEvent e) {
					// TODO Auto-generated method stub
					
				}
			});
	        
	        //设置窗口显示属性
	        frame.setSize(400,300);
	        frame.setLocation(250, 250);
	        frame.setVisible(true); 
	        frame.validate();
	        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
	    }
	}

实现后的效果图如下：

本文地址：https://blog.csdn.net/weixin_45792450/article/details/112000536