Leetcode002 -- inverts the numeric portion of a signed integer

import java.util.Scanner;

public class test02 {
    /**
     *  To give you one  32  Signed integer of bit  x , Return to  x  The result of reversing the number part in .
     *  If the integer after inversion exceeds  32  The range of signed integers of bits [?2**31, 2**31? 1] , Just go back to  0.
     *  Suppose the environment doesn't allow storage  64  An integer （ With or without sign ）.
     *
     *  Example  1：
     *  Input ：x = 123
     *  Output ：321
     *  Example  2：
     *  Input ：x = -123
     *  Output ：-321
     *  Example  3：
     *  Input ：x = 120
     *  Output ：21
     *  Example  4：
     *  Input ：x = 0
     *  Output ：0
     *
     *  Tips ：
     * -231 <= x <= 231 - 1
     *
      * @param args
     */

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print(" Please enter an integer ：");
        int x = sc.nextInt();

        System.out.println(" After integer inversion is ："+reverse(x));

    }

    public static int reverse(int x){

        int rev = 0;
        while( x != 0 ){
            if( rev > Integer.MAX_VALUE && rev <Integer.MIN_VALUE){
                return 0;
            }
            int digit = x%10;
            rev = rev*10 + digit;
            x /= 10;
        }
        return rev;
    }
}