java用链表实现栈

package cn.itcast.stack;

public class Stack01 {

	public static void main(String[] args) {
		ListNode listnode = new ListNode();
		listnode.add(1);
		listnode.add(2);
		listnode.add(3);
		listnode.add(4);
		listnode.add(5);
		int i = 6;
		while(i>=0){
			listnode.pop();
			i--;
		}
	}

}
class ListNode{
	Node head = new Node(0);
	//Node temp = head;
	public void add(int id){
		Node node = new Node(id);
			if(head.getNext()==null){
				head.setNext(node);
			}
			else{
				node.setNext(head.getNext());
				head.setNext(node);
			}
			
			System.out.println("添加"+head.getNext().getId()+"成功");
	}
	public void pop(){
		if(head.getNext()==null){
			System.out.println("栈为空，出栈失败");
			return;
		}
		else{
			if(head.getNext().getNext()==null){
				System.out.println("出栈结果为"+head.getNext().getId());
				head.setNext(null);
				return;
			}
			else{
				System.out.println("出栈结果为"+head.getNext().getId());
				head.setNext(head.getNext().getNext());
			}
		}
	}
	
}
class Node {
	private int id;
	private Node next;
	public Node(int id) {
		this.id = id;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public Node getNext() {
		return next;
	}
	public void setNext(Node next) {
		this.next = next;
	}
	
}