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Java输入建立链表_java键盘录入链表

java键盘录入链表

尾插法

//尾插法
import java.util.Scanner;

class ListNode
{
    int val;
    ListNode next;
    public  ListNode()
    {}
    public ListNode(int val)
    {
        this.val = val;
    }
    public ListNode(int val,ListNode next)
    {
        this.val = val;
        this.next = next;
    }
}

public class create {
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        ListNode head = new ListNode();
        int x =sc.nextInt();
        while (x!=-1)
        {
            ListNode s = new ListNode(x);
            s.next = head.next;
            head.next = s;
            x = sc.nextInt();
        }
        ListNode p = head.next;
        while(p!=null)
        {
            System.out.println(p.val);
            p = p.next;
        }
    }
}

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头插法

package Lianbiao;
import java.util.Scanner;

//头插法
public class create2 {
    public static void main(String[] args)
    {
        ListNode head = new ListNode();
        ListNode p = head;
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        while(x!=-1)
        {
            ListNode s = new ListNode(x);
            p.next = s;
            p = s;
            x = sc.nextInt();
        }
        p.next = null;
        p = head.next;
        while(p!=null)
        {
            System.out.println(p.val);
            p = p.next;
        }
    }
}

var foo = 'bar';
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