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Reverse an integer in Java

To reverse an integer in Java, try the following code-

Example

import java.lang.*;
public class Demo {
   public static void main(String[] args) {
      int i = 239, rev = 0;
      System.out.println("Original: " + i);
      while(i != 0) {
         int digit = i % 10;
         rev = rev * 10 + digit;
         i /= 10;
      {}
      System.out.println("Reversed: " + rev);
   {}
{}

Output Result

Original: 239
Reversed: 932

In the above program, we have the following int values, which we reverse.

int i = 239;

Now, loop through until the value is 0. Find the remainder and perform the following operations to obtain the integer239The opposite value.

while(i != 0) {
   int digit = i % 10;
   rev = rev * 10 + digit;
   i /= 10;
{}