算法之链表逆序排列

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/**
 *
 */
package com.zimo.sequence;

/**
 * 逆序排列
 * @author 子墨
 *
 * 2015-3-11下午2:31:55
 */
public class Node {

	int data;
	Node next = null;

	public Node(int data){
		this.data=data;
	}

	/**
	 * 1->2->3->4->5->6->7->8->9
	 * 定义一个p
	 * 1.取1,付给p
	 * 2.取2,2->1
	 * 3.去3,3->2->1依次类推
	 * @param head
	 * @return
	 */
	 public static Node reverse(Node head){
		 Node p = null;
		 Node q = head;

		 while (head.next!=null) {
			p = head.next;
			head.next = p.next;
			p.next = q;
			q = p;

		}
		 return q;
	 }
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Node head = new Node(0);
		Node node = head;
		/**
		 * 给node赋值
		 * 1->2->3->4->5->6->7->8->9
		 */
		for(int i = 1 ; i < 10; ++i){
			Node n = new Node(i);
			node.next = n;
			node = n;
			System.out.println(n.data);
		 }

		head = reverse(head);

		while(head.next != null){
			 System.out.println(head.data);
			 head = head.next;
		}
	}

}