package demo;

import java.util.LinkedList;

public class DuiLie {

    private LinkedList list;

    public DuiLie(){          //当对象被new出来的同时创建LinkedList

         list= new LinkedList();

    }

    //队列添加元素的功能

    public void myAdd(Object obj){

        list.addFirst(obj);

    }

    //获取

    public  Object myGet(){

        return list.removeLast();   //移除指针位置上的元素且返回元素

    }

    public boolean isNull(){    //判断集合是否为空

        return list.isEmpty();

    }

}

 public static void main(String[] args) {

      DuiLie duiLie= new DuiLie();

        duiLie.myAdd("1");

        duiLie.myAdd("2");

        duiLie.myAdd("3");

        duiLie.myAdd("4");

        while (!duiLie.isNull()){

            System.out.print(duiLie.myGet());//1234

        }

    }