链接列表:未按预期工作

时间:2015-06-28 11:34:16

标签: java linked-list

我创建了一个单独的链接列表,它给出了以下错误。不确定有什么问题,蚂蚁建议

错误/ OP - 列表是javaTest.LinkedListcreation@1540e19d

我不确定输出中的这个值是什么意思。

处理完成,退出代码为0

public  class LinkedList{

public static  void main (String[] a){
    LinkedListcreation L1 = new LinkedListcreation();
    L1.addNodeAtEnd("1");
    System.out.print("List is " + L1);
}

}

class LinkedListcreation {

int listcount;
node head;

LinkedListcreation() {
    head = new node(0);
    listcount=0;
}


node Temp;

void addNodeAtEnd(Object d){
    node Current = head;
    Temp = new node(d);
    while (Current.getNext()!= null){
        Current = Current.getNext();
    }

    Current.setNext(Temp);

    listcount++;
}

}


class node {

Object data;
node next;

node(Object d) {
    next = null;
    this.data=d;
}

node(Object d, node nextNode) {
    next = nextNode;
    this.data=d;
}

   public Object getdata(){
   return data;
   }


public void setdata(int d){
    data = d;
}

public node getNext(){
    return next;
}

public void setNext (node nextValue){
    next = nextValue;
}
}

5 个答案:

答案 0 :(得分:1)

您的代码没问题,但为了打印有关对象的有用信息(本例中的列表),您需要覆盖toString类中的LinkedListcreation方法。

例如:

public String toString() {
    return "List with " + this.listcount + " nodes.";
}

答案 1 :(得分:0)

您正在尝试打印列表对象而不是您添加的元素,而不是您看到的不是错误。检查java中的toString()方法,了解你看到的输出。

修改您的main(),如下所示,查看您添加的元素。

 public static  void main (String[] a){
   LinkedListcreation L1 = new LinkedListcreation();
  L1.addNodeAtEnd("1");
   System.out.print("List is " + L1.head.next.data);

}

输出:列表为1

答案 2 :(得分:0)

正如大家所说,你必须覆盖toString()。在这里你有正确的实现:

public String toString() {
    StringBuilder sb = new StringBuilder();
    sb.append("[");
    sb.append(head.data.toString());

    node n;
    while(n = head.getNext() != null)
        sb.append(", " + n.data.toString());

    sb.append("]");
    return sb.toString();
}

答案 3 :(得分:0)

您的代码没有任何错误。如果要在列表中打印节点,只需在LinkedListcreation类中添加另一个函数,该函数将迭代列表并打印每个节点的数据。在LinkedListcreation类中添加此块。

public void printList(){
node current = head.next;
while(current!=null){
    System.out.println("node's data is: "+ current.getdata());
    current = current.getNext();
}

}

同样在您的主函数中,使用列表的对象L1调用上述函数。

L1.printList();

答案 4 :(得分:-1)

代码有编译错误。请尝试更正下面的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace ConsoleApplication1
{
    class LinkedList
    {

        static void Main(String[] a){
           LinkedListcreation L1 = new LinkedListcreation();
           L1.addNodeAtEnd("1");
           Console.WriteLine("List is " + L1);
        }

    }

    public class LinkedListcreation
    {

        int listcount;
        node head;

        public LinkedListcreation()
        {
            head = new node(0);
            listcount = 0;
        }


        node Temp;

        public void addNodeAtEnd(Object d)
        {
            node Current = head;
            Temp = new node(d);
            while (Current.getNext() != null)
            {
                Current = Current.getNext();
            }

            Current.setNext(Temp);

            listcount++;
        }

    }


    public class node
    {

        Object data;
        node next;

        public node(Object d)
        {
            next = null;
            this.data = d;
        }

        node(Object d, node nextNode)
        {
            next = nextNode;
            this.data = d;
        }

        public Object getdata()
        {
            return data;
        }


        public void setdata(int d)
        {
            data = d;
        }

        public node getNext()
        {
            return next;
        }

        public void setNext(node nextValue)
        {
            next = nextValue;
        }
    }

}
​
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