算法：（Java）用单链表实现栈结构

先进后出

public class list_2 {

    //单链表实现栈
    //队列:先进先出
    //栈：(弹夹结构)先进后出

    public static  class Node{
        public  V value;
        public  Node next;
        public  Node(V v){
            value=v;
            next=null;
        }
    }

    public  static  class MyStack
    {
        private Node head ;
        private  int size=0;

        public  MyStack(){
            head=null;
            size=0;
        }
        public  boolean isEmpyt(){
            //栈有无元素
            return size==0;
        }
        public  int size(){
            //栈有几个元素
            return size;
        }
        public void push(V value){
           Node cur=new Node<>(value);
            if(head==null)
            {
                head=cur;
            }else {
                cur.next=head;//指针指向最新加入的元素
                head=cur;
            }
            size++;
        }
        public V pop(int i)
        {
            //先进先出
            V ans=null;
            if(head!=null){
                ans=head.value;
                head=head.next;
                size--;
            }
            return ans;
        }
        public V peak()
        {//获得此时弹出的节点
            return head!=null?head.value:null;
        }
    }

    public static void main(String[] args) {
        MyStack mystack=new MyStack();
//        mystack.offer(1);给任意值

        for (int i = 0; i <4 ; i++) {
            mystack.push(i);
        }
        for (int i = 0; i < 4; i++) {
            System.out.println(mystack.pop(i));
            //System.out.println(mystack.peak());
        }
    }

}