Example code sharing of Java singly linked list flip implementation

Java implements singly linked list reversal, recursive and non-recursive. Next, through this article, I will share with you the example code of Java to implement singly linked list reversal. If you need it, please refer to

Java to implement singly linked list reversal, recursive and non-recursive.

/**
 * 反转单链表
 */

/** * 定义链表
 * 
 * @author 16026
 *
 */
class Node {
  int val;
  Node next;
  public Node(int val) {
    this.val = val;
  }
}
public class ReverseList {
  /**
   * 反转链表
   * 
   * @param head
   * @return
   */
  public static Node reverseList(Node head) {
    if (head == null || head.next == null) {
      return head;
    }
    Node reHead = null;// 定义新链表头结点
    while (head != null) {
      Node cur = head.next;// 记录下一个节点
      head.next = reHead;// 将rehead节点连接到head节点上
      reHead = head;// 让rehead指向head
      head = cur;// 将head指向下一个节点
    }
    return reHead;
  }
  /**
   * 递归反转链表
   * 
   * @param head
   * @return
   */
  public static Node reverseList2(Node head) {
    if (head == null || head.next == null)
      return head;
    Node rehead = reverseList2(head.next);
    head.next.next = head;// 将头节点置于末端
    head.next = null;// 防止链表循环
    return rehead;
  }
  /**
   * 打印链表
   * 
   * @param head
   */
  public static void printList(Node head) {
    if (head == null)
      return;
    while (head != null) {
      System.out.print(head.val + " ");
      head = head.next;
    }
  }
  /**
   * 测试
   * 
   * @param args
   */
  public static void main(String[] args) {
    Node n1 = new Node(1);
    Node n2 = new Node(2);
    Node n3 = new Node(3);
    Node n4 = new Node(4);
    Node n5 = new Node(5);
    n1.next = n2;
    n2.next = n3;
    n3.next = n4;
    n4.next = n5;
    // Node rehead = reverseList(n1);
    Node rehead = reverseList2(n1);
    printList(rehead);
  }
}

Running results as follows:

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