Java 集合 之 List 多级菜单

http://www.verejava.com/?id=1699459079815

package com.menu;

import java.util.List;

public class TestCategory
{
	public static String level="";
	
	public static void main(String[] args)
	{
		MenuManager mm=new MenuManager();
		mm.add(new Menu(0,-1,"主控管理系统"));
		mm.add(new Menu(100,0,"主控管理"));
		mm.add(new Menu(101,0,"公共信息"));
		mm.add(new Menu(102,0,"本单位管理"));
		mm.add(new Menu(103,0,"下属管理"));
		mm.add(new Menu(104,0,"部门管理"));
		mm.add(new Menu(105,0,"职位管理"));
		mm.add(new Menu(10000,104,"部门类别"));
		mm.add(new Menu(10001,104,"部门信息"));
		
		List<Menu> menuList=mm.getMenuList();
		for(int i=0;i<menuList.size();i++)
		{
			Menu menu=menuList.get(i);
			if(menu.getPid()==-1)
			{
				System.out.println(menu.getName());
				showMenu(menu,menuList);
				break;
			}
		}
		
	}
	
	public static void showMenu(Menu parentMenu,List<Menu> menuList)
	{
		level+="----";
		for(int i=0;i<menuList.size();i++)
		{
			Menu menu=menuList.get(i);
			if(menu.getPid()==parentMenu.getId())
			{
				System.out.println(level+menu.getName());
				showMenu(menu,menuList);
			}
		}
		level=level.substring(0,level.length()-4);
	}
}





package com.menu;

public class Menu
{
	private int id;
	private int pid;
	private String name;
	
	public Menu(int id, int pid, String name)
	{
		super();
		this.id = id;
		this.pid = pid;
		this.name = name;
	}
	public int getId()
	{
		return id;
	}
	public void setId(int id)
	{
		this.id = id;
	}
	public int getPid()
	{
		return pid;
	}
	public void setPid(int pid)
	{
		this.pid = pid;
	}
	public String getName()
	{
		return name;
	}
	public void setName(String name)
	{
		this.name = name;
	}
	
	
}





package com.menu;

import java.util.ArrayList;
import java.util.List;

public class MenuManager
{
	private List<Menu> menuList=new ArrayList<Menu>();
	
	public void add(Menu menu)
	{
		menuList.add(menu);
	}

	public List<Menu> getMenuList()
	{
		return menuList;
	}

	public void setMenuList(List<Menu> menuList)
	{
		this.menuList = menuList;
	}
	
	
}

http://www.verejava.com/?id=1699459079815