Java循环单链表

public class Node {
    public String num;
    public Node next=null;
    public Node(String num){
        this.num=num;
    }
    public Node(){
        num=null;
        next=this;
    }
}

public class MyLinkList {
    private Node headNode;
    private Node tempNode;
    public MyLinkList(){
        headNode=new Node();
    }
    public boolean addNode(String num){
        Node node = new Node(num);
        tempNode = headNode;
        while (tempNode.next != headNode) {
            tempNode = tempNode.next;
        }
        tempNode.next = node;
        node.next=headNode;
        System.out.println("结点增加成功");
        return true;
    }
    public boolean deleteNode(){
        tempNode = headNode;
        while (tempNode.next.next!= headNode) {
            tempNode=tempNode.next;
        }
        tempNode.next=headNode;
        System.out.println("结点删除成功");
        return true;
    }
    public void seeNode(){
       tempNode = headNode;
       while (tempNode.next!=headNode){
           System.out.println(tempNode.num);
           tempNode=tempNode.next;
       }
       System.out.println(tempNode.num);
    }
}

测试

public static void main(String[] args)  {
       MyLinkList list=new MyLinkList();
       list.addNode("a");
       list.addNode("b");
       list.addNode("c");
       list.deleteNode();
       list.seeNode();
    }

结果：
结点增加成功
结点增加成功
结点增加成功
结点删除成功
null
a
b