Java如何实现链表栈

public class DynamicLinkedStack {  private Node head;  /**   * 添加节点   * 头插入法   *   * @param node   */  public void addNode(Node node) {    if (null == head) {      head = node;    } else {      Node temp = head;      head = node;      head.next = temp;    }  }

  public Node pop() {    return head;  }  public static void main(String[] args) {    DynamicLinkedStack dynamicLinkedStack=new DynamicLinkedStack();    Node node=new Node();    node.setData("1");    Node node1=new Node();    node1.setData("2");    Node node2=new Node();    node2.setData("3");    dynamicLinkedStack.addNode(node);    dynamicLinkedStack.addNode(node1);    dynamicLinkedStack.addNode(node2);    System.out.println(dynamicLinkedStack);  }}