Number Pallendrom checking in java

public class Pallendrom {

      public boolean isPallendrom(int num) {

            int tmp = num;

            int rem = 0;

            int sum = 0;

            while (tmp > 0) {

                  rem = tmp % 10;

                  sum = sum * 10 + rem;

                  tmp = tmp / 10;

            }

            return (sum == num);

      }

      public static void main(String[] args) {

            int a = 12321;

            Pallendrom p = new Pallendrom();

            if(p.isPallendrom(a)){

                  System.out.println(a + " is Pallendrom.");

            }else{

                  System.out.println(a + " is not Pallendrom.");

            }

      }

}