Remove Linked List Elements

于 2015-10-26 16:12:03 发布 · 70 阅读

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本文介绍如何使用Java实现删除链表中所有值为指定数值的元素的方法，包括链表节点定义、删除逻辑及示例代码。

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Remove all elements from a linked list of integers that have value val.

Example
Given: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6
Return: 1 --> 2 --> 3 --> 4 --> 5

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
public class Solution {
    public ListNode removeElements(ListNode head, int val) {
        if (head == null) {
        	return null;
        }
        ListNode listNode = new ListNode(0);
        listNode.next = head;
        head = listNode;
        while (head.next != null) {
        	if (head.next.val == val) {
        		head.next = head.next.next;
        	} else {
        		head = head.next;
        	}
        }
        return listNode.next;
    }
}