Java之仿js实现树状折叠菜单

本篇文章给大家分享的内容是Java之仿js实现树状折叠菜单，有着一定的参考价值，有需要的朋友可以参考一下

代码

package com.tuzi;import java.awt.BorderLayout;  

import java.awt.Color;  import java.awt.GridLayout;  
import java.awt.event.ActionEvent;  
import java.awt.event.ActionListener;   

import javax.swing.JButton;  
import javax.swing.JFrame;  
import javax.swing.JPanel;  
import javax.swing.JScrollPane;  

public class B extends JFrame{
      private JButton btn1,btn2,btn3,btn4,btn5;      
      private JPanel pNorth,pSouth,subMenuContainer;      
      private JScrollPane pCenter;      
      private JButton[] btn = null;      
      private static boolean expand=false;      
      
      public B(){
          btn1=new JButton("Grade1 menu1");
          btn1.setBackground(Color.CYAN);
          btn2=new JButton("Grade1 menu2");
          btn2.setBackground(Color.CYAN);
          btn3=new JButton("Grade1 menu3");
          btn3.setBackground(Color.CYAN);
          btn3.addActionListener(new ActionHandler());

          btn4=new JButton("Grade1 menu4");
          btn4.setBackground(Color.CYAN);
          btn5=new JButton("Grade1 menu5");
          btn5.setBackground(Color.CYAN);
          pNorth=new JPanel();
          pNorth.setLayout(new GridLayout(3,1));
          pSouth=new JPanel();
          pSouth.setLayout(new GridLayout(2,1));
          subMenuContainer=new JPanel();
          subMenuContainer.setLayout(new GridLayout(25,1));

          btn=new JButton[25];        
          for(int i=0;i
效果图


							

								
								

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