如何将字符串插入 java 中的链表

Question

我正在编写一个程序，将String类型的数据添加到循环双向链表中，并在java中查看它们。我想知道如何将字符串添加到链表以及如何获取输出。

我尝试的方式报错：“The constructor Node() is undefined” 如何解决这个问题。

这是我试过的代码：

class Node {
    int data;
    Node nextNode;
    Node prevNode;
}

class CircularDoublyLL {
    Node head = null;
    Node tail = null;

    public void insertLast(String songName) {
        Node newNode = new Node();
        newNode.data = songName;

        if (head == null) {
            head = tail = newNode;
            head.nextNode = head;
            head.prevNode = head;
        } else {
            tail.nextNode = newNode;
            newNode.prevNode = tail;
            newNode.nextNode = head;
            head.prevNode = newNode;
            tail = newNode;
        }
    }

    public void displayPlayist() {
        Node currentNode = head;
        if (head == null) {
            System.out.println("Playlist is empty!");
        } else {
            int songNo = 1;
            while (currentNode != tail) {
                System.out.println("Song " + songNo + ": " + currentNode.data);
                currentNode = currentNode.nextNode;
                songNo++;
            }
            System.out.println("Song " + songNo + ": " + currentNode.data);
        }
    }
}

public class MusicPlayer {
    public static void main(String[] args) {
        CircularDoublyLL playlist = new CircularDoublyLL();

        playlist.insertLast("Song Name 1");
        playlist.insertLast("Song Name 2");
        playlist.insertLast("Song Name 3");
        playlist.insertLast("Song Name 4");
        playlist.displayPlayist();
    }
}

Answer 1

对于字符串更改：

class Node {
    int data;
    Node nextNode;
    Node prevNode;
}

到

class Node {
    String data;
    Node nextNode;
    Node prevNode;
}

或

class Node {
    Object data;
    Node nextNode;
    Node prevNode;
}

（对象将允许任何数据类型）

如何将字符串插入 java 中的链表

How to insert strings into a linked list in java

java

circular-list

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doubly-linked-list