Java - 遍历链表仅返回null

Question

我正在研究链表。在《Cracking the Coding Interview》一书的帮助下，我创建了以下代码来创建链接列表，在其末尾添加元素并打印元素。然而，当我运行代码时，它仅返回“null”，而不是打印列表，即“Sanchez”。 “厄齐尔”和“维尔贝克”。帮忙？

public class CreateLinkedList{

    static class Node{
        String PlayerName;
        Node next = null;

        //Constructor
        Node(String PName){
            PlayerName = PName;
        }

        //Method to insert a Node
        void InsertNodeAtEnd(String PlayerName){
            Node transition = new Node(PlayerName);
            Node n = this;
            while(n.next != null){
                n = n.next;
                }
            n.next = transition;            
            }       

        //Method to print all elements of linked list
        void PrintList(){
            Node n = this;
            while (n.next != null){
                System.out.println(n.PlayerName + "\n");
                n = n.next;
            }
        }
    }

    public static void main(String[] args) {

        Node first = new Node("Sanchez");
        first.InsertNodeAtEnd("Ozil");
        first.InsertNodeAtEnd("Welbeck");
        first.PrintList();
    }   
}

Answer 1

public class CreateLinkedList {
static class Node {
    String PlayerName;
    Node next = null;

    // Constructor
    Node(String PName) {
        PlayerName = PName;
    }

    // Method to insert a Node
    void InsertNodeAtEnd(String PlayerName) {
        Node transition = new Node(PlayerName);
        Node n = this;
        while (n.next != null) {
            n = n.next;
        }
        n.next = transition;
    }

    // Method to print all elements of linked list
    void PrintList() {
        Node n = this;
        while (n != null) {
            System.out.println(n.PlayerName + "\n");
            n = n.next;
        }
    }
}

public static void main(String[] args) {

    Node first = new Node("Sanchez");
    first.InsertNodeAtEnd("Ozil");
    first.InsertNodeAtEnd("Welbeck");
    first.PrintList();
}
}

输出

Sanchez

Ozil

Welbeck