java单链表逆序用法代码示例

Node pre = null;
Node post = null;

while(head!=null){
 post = head.next;
 head.next = pre;
 pre = head;
 head = post;
}

package list;
public class ReverseList {
	public static void main(String[] args) {
		Node head = new Node(1);
		int[] value = {2,3,4,5};
		Node temp = head;
		for (int i = 0 ; i< value.length;i++) {
			Node node = new Node(value[i]);
			temp.next = node;
			temp = temp.next;
		}
		printList(head);
		// 反序输出一个单链表
		head = reverse(head);
		printList(head);
		// 再次反向
		head = reverseSingleList(head);
		printList(head);
	}
	public static void printList(Node head) {
		while(head!=null) {
			System.out.print("\t"+head.value);
			head = head.next;
		}
		System.out.println();
	}
	public static Node reverse(Node head) {
		Node pre = null;
		Node post = null;
		while(head!=null) {
			post = head.next;
			head.next = pre;
			pre = head;
			head = post;
		}
		return pre;
	}
	public static Node reverseSingleList(Node head) {
		Node pre = null;
		Node next = null;
		while(head!=null) {
			next = head.next;
			head.next = pre;
			pre = head;
			head = next;
		}
		return pre;
	}
}
class Node {
	public int value;
	public Node next;
	public Node(int value) {
		this.value = value;
	}
}

/** 
 * java 实现单链表的逆序 
 * @author Administrator 
 * 
 */
public class SingleLinkedReverse {
	class Node{
		int data;
		Node next;
		public Node(int data){
			this.data = data;
		}
	}
	public static void main(String[] args) {
		SingleLinkedReverse slr = new SingleLinkedReverse();
		Node head, tail;
		head = tail = slr.new Node(0);
		for (int i=1; i<10; i++){
			Node p = slr.new Node(i);
			tail.next = p;
			tail = p;
		}
		tail = head;
		while(tail != null){
			System.out.print(tail.data+" ");
			tail = tail.next;
		}
		head = reverse(head);
		System.out.println(" ");
		while(head != null){
			System.out.print(head.data+" ");
			head = head.next;
		}
	}
	private static Node reverse(Node head) {
		Node p1,p2 = null;
		p1 = head;
		while(head.next != null){
			p2 = head.next;
			head.next = p2.next;
			p2.next = p1;
			p1 = p2;
		}
		return p2;
	}
}