Q3.Reverse an Integer in Java

package practice1;

public class Q3_ReverseInteger {

public static void main(String[] args) {

int num=12345;

int rev=0;

while(num!=0) {

rev=rev*10+num%10; //5

num=num/10;//1234

}

System.out.println(rev);

//example 2

//Here string buffer is mutable

int s1=9876;

System.out.println(new StringBuffer(String.valueOf(s1)).reverse());

}

}