Java application to add two numeric values without using + (plus) and - (minus) operators

Here i am implementing a class to do addition operation without using + and - operator.
In this program i am using AND gate (&), XOR gate (^), and a left shift (<<) operator

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import java.util.Scanner;
public class TestClass 
{
public static void main(String[] args) 
{
/*
* object of scanner class to get input from keyboard
*/
Scanner sc = new Scanner(System.in);

System.out.print("enter number1:");
/*
* input int value from keyboard and store it inside variable number1
*/
int number1 = sc.nextInt();

System.out.print("enter number2:");
/*
* input int value from keyboard and store it inside variable number2
*/
int number2 = sc.nextInt();

System.out.print("addition of "+number1+" and "+number2+" is ");

while(number2 != 0) 
{
/*
* calculating carry of bits by using logic AND gate operator
*/
int carry = number1 & number2;

/*
* calculating addition by using logic XOR gate operator
*/
number1 = number1 ^ number2;

/*
* left shifting the bits of carry using left shift << operator
*/
number2 = carry << 1;
}
/*
* printing the result
*/
System.out.print(number1);
}
}