单向链表的反转Java实现_反转单链表 完整java代码

单向链表的反转Java实现如下

public class NodeList {


    public static class ListNode {
        int val;
        ListNode next;

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

    }

    //递归修改当前节点的next节点，最终返回新的首节点
    public static ListNode recursion(ListNode next) {
        if (next == null || next.next == null) {
            return next;
        }
        ListNode node = recursion(next.next);
        next.next.next = node;
        next.next = null;
        return node;
    }


    public static void main(String[] args) {
        ListNode node5 = new ListNode(5, null);
        ListNode node4 = new ListNode(4, node5);
        ListNode node3 = new ListNode(3, node4);
        ListNode node2 = new ListNode(2, node3);
        ListNode node1 = new ListNode(1, node2);
        ListNode node_1 = recursion(node1);
        System.out.println(node_1.val);
    }

}