Palindrome Number

给一个数字, 问是不是回文数字. 写一个数字倒转的方法, 然后看一下即可.

public class Solution {
    public boolean isPalindrome(int x) {
        if(x < 0)
            return false;
        return x == rev(x);
    }
    public int rev(int x) {
        int res = 0;
        while(x != 0){
            res = res * 10 + x % 10;
            x = x / 10;
        }
        return res;
    }
}