题解 | #牛群编号的回文顺序#

import java.util.*;

/*
 * public class ListNode {
 *   int val;
 *   ListNode next = null;
 *   public ListNode(int val) {
 *     this.val = val;
 *   }
 * }
 */

public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param head ListNode类 
     * @return bool布尔型
     */
    public boolean isPalindrome (ListNode head) {
        // write code here
        StringBuilder sb = new StringBuilder();
        while(head != null){
            sb.append(head.val);
            head = head.next;
        }
        StringBuilder sb1 =  sb.reverse();
        if(sb.toString().equals(sb.reverse().toString())){
            return true;
        }else{
            return false;
        }
    }
}