Java program to reverse a number

I wrote this Java program to reverse a number using a while loop. Is this the correct approach, or is there a more efficient way to do this in Java?

class ReverseNumber {    public static void main(String[] args) {        int num = 1234;        int reversed = 0;        while (num != 0) {            int digit = num % 10;            reversed = reversed * 10 + digit;            num /= 10;        }        System.out.println("Reversed Number = " + reversed);    } }

Like in your other thread. Please put some effort in testing your own code, that's your responsibility to test to your best abilities.

Please show us what inputs you have tried and what outputs you got. If that won't answer, then we can discuss the outcomes in more detail.

Welcome to the Ranch

Make sure to test your program with negative numbers, unless you are specifically restricting its domain to natural numbers.
You aren't writing object‑oriented code, but procedural code. I suggest you change to a functional style:-/* Remove lines 3-7 if negative numbers are permitted. */ public static int reverseNumber(int i) {   if (i < 0)   {      throw new IllegalArgumentException(            "Negative numbers not allowed);   }   // ...   return ...; } // ...You can now use that method from elsewhere, preferably in a second class.

Please always use the code button. I shall use it on your code and you can see how much better it will look