java - 学习 LinkedList 和 Nodes，但我在 buildList 方法的 newNode 上不断收到 "cannot be resolved or is not in field"错误

Question

这几天我一直在试图解决这个问题，但我所做的一切都是错误的。对于 buildList 方法中 newNode.next 上的 .next，我不断收到“无法解析或不在字段中”错误。对于 printList 方法中 current.next/current.data 上的 .next 和 .data，我也遇到同样的错误。我所拥有的是书上的内容，但它不想在 Eclipse 中工作。请帮忙...

package linkedList;

import java.util.*;
import org.w3c.dom.Node;

public class ListOne {
    //This part needs various options:
    //Build list
    //clear list
    //check if the list is sorted
    //insert at head
    static Scanner input = new Scanner(System.in);
    public static Node head;
    public int linkedListCount = 0;
    //public static LinkedList<Integer> intList = new LinkedList<Integer>();

    private class MyNode{
        private int data;
        private Node next;

        public MyNode(int data){
            this.data = data;
            this.next = null;
        }
    }
        //BUILD LIST
    public void buildList(int value){
        Node newNode = (Node) new MyNode(value);
        newNode.next = head;
        head = newNode;
    }
        //Clear the list
    public void clearList(){
        head = null;
    }

    public void printList () {
        if(head == null){
            return;
        }
        Node current = head;
        while (current != null) {
            // visit
            System.out.println(current.data);
            current = current.next;
        }  // traversal
    }  // printList


    public boolean isEmpty(){
        return head == null;
    }
}

Here is the errors I am receiving. In method buildList, on newNode.next = "next cannot be resolved or is not a field." / In method printList, on current.data = "data cannot be resolved or is not a field." / In method printList, on current.next = "next cannot be resolved or is not a field."

Answer 1

我根本看不出使用 Node 接口(interface)有什么意义。只需使用 MyNode 即可:

package linkedList;

import java.util.*;
//import org.w3c.dom.Node;  No need for this

public class ListOne {
    // .....
    public static MyNode head;
    private class MyNode{
        private int data;
        private MyNode next;

        public MyNode(int data){
            this.data = data;
            this.next = null;
        }
    }
    //BUILD LIST
    public void buildList(int value){
        MyNode newNode = new MyNode(value);
        newNode.next = head;
        head = newNode;
    }
    // etc....
}