Question

我正在尝试在java中实现链接列表，但没有任何内容被打印出来。我尝试调试它，似乎每次调用Add函数时都会重写前一个值。但是，当我检查它的逻辑时，它应该工作。

public class MyLinkedList {

public Node head;
public Node curr;

public MyLinkedList() {
    // TODO Auto-generated constructor stub
    head = null;
    curr = null;
}

public void Add(int data) {
    Node box = new Node();
    box.data = data;
    box.next = null;
    curr = head;
    if (curr == null) {
        head = box;
        curr = null;
    }

    else {
        while (curr.next != null) {
            curr = curr.next;

        }
        curr.next = box;
    }
}

public void Print() {
    curr = head;
    while (curr != null) {
        System.out.println(curr.data);
        curr = curr.next;
    }
}
}

这就是Node类所拥有的

public class Node {
    public int data;
   public Node next;
}

Answer 1

你的代码很好。只需去删除* .class文件。它可能会停留在代码的早期阶段。 * .class文件位于输出文件夹下（文件夹的名称可能会根据您使用的IDE而改变，但通常在构建文件夹下。）您可能需要完全删除该文件夹。

Answer 2

它已经有效，但我会为你整理一下：

public class MyLinkedList {

    private Node head; //never expose a field as public

    //the whole constructor was unnecessary

    public void add(int data) { //methods start with a lower case
        add(new Node(data)); //nodes always need data, so I'm passing in constructor
    }

    // this method adds an existing node rather than the previous add both
    // creating, finding the end and adding
    private void add(Node node) {
        if (head == null) {
            head = node;
        } else {
            lastNode().next = node;
        }
    }

    private Node lastNode() { //finds the last node in the chain
        Node curr = head; //curr is local
        while (curr.next != null) {
            curr = curr.next;
        }
        return curr;
    }

    public void print() { //methods start with a lower case
        Node curr = head; //curr is local
        while (curr != null) {
            System.out.println(curr.data);
            curr = curr.next;
        }
    }

    private static class Node { //this class is just useful internally to MyLinkedList
        private final int data; //final - node data doesn't change
        private Node next;

        private Node(int data) {
            this.data = data;
        }
    }
}

在java

2 个答案: