输入一个链表,从尾到头打印链表每个节点的值。
代码一:
/*** public class ListNode {* int val;* ListNode next = null;** ListNode(int val) {* this.val = val;* }* }**/import java.util.ArrayList;import java.util.*;public class Solution { public ArrayListprintListFromTailToHead(ListNode listNode) { Stack stack = new Stack (); while (listNode != null) { stack.push(listNode.val); listNode = listNode.next; } ArrayList list = new ArrayList (); while (!stack.isEmpty()) { list.add(stack.pop()); } return list; }}
代码二:
/*** public class ListNode {* int val;* ListNode next = null;** ListNode(int val) {* this.val = val;* }* }**/import java.util.ArrayList;import java.util.*;public class Solution { public ArrayListprintListFromTailToHead(ListNode listNode) { ArrayList list=new ArrayList (); ListNode pNode=listNode; if(pNode!=null){ if(pNode.next!=null){ list=printListFromTailToHead(pNode.next); } list.add(pNode.val); } return list; }}