LeetCode刷题之Reverse_Integer_0007

java版本：

public static void main(String[] args) {

    System.out.println(reverse_plus(-123));

}


  // 数字转字符数组 ===>倒叙，再转数字
  public static int reverse(int x) {

    String strX = "";
    boolean flag = false;
    if(x < 0){
        x = -x;
        flag = true;
    }

      strX += x;
      char[] ArrX = strX.toCharArray();
      strX = "";
      for (int i = ArrX.length-1; i >=0; i--){
          strX += ArrX[i];
      }

      try{
          return  flag? -Integer.parseInt(strX):Integer.parseInt(strX);
      }catch (NumberFormatException e){
          return 0;
      }
  }

  //纯数字游戏  倒着数数
  public static int reverse_plus(int x) {

    long n = 0;
    while (x!=0){
        n = n * 10 + x%10;
        x = x / 10;
    }
    return (int)n == n? (int) n : 0;

  }