java实现整数反转

class Solution { public int reverse(int x) { long nums = 0; int temp = 1; try { temp = x / Math.abs(x); StringBuilder num = new StringBuilder(); num.append(Math.abs(x)); nums = Long.parseLong(num.reverse().toString()); if(nums > Math.pow(2, 31) - 1) { return 0; } } catch (Exception e) { // TODO: handle exception return 0; } return (int)nums*temp; } }

class Solution { public int reverse(int x) { int ans = 0; while(x != 0) { // 判断溢出 if((ans * 10) / 10 != ans) { ans = 0; break; } // ans*10 没有溢出 ans = ans * 10 + x % 10; x /= 10; } return ans; } }