Program to demonstrate how to reverse a number in Java
import java.util.Scanner;
public class ReverseNumber {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number to reverse : ");
int original = scanner.nextInt();
int reverse = 0;
int remainder;
while(original != 0) {
remainder = original % 10;
reverse = reverse * 10 + remainder;
original = original / 10;
}
System.out.println("Reverse of number is : " + reverse);
}
}
Output of the program : 
