subtract two numbers without using arithmetic operators in java

1public class SubtractWithoutArithmeticOperators
2{
3   static int subtractNumber(int i, int j)
4   {
5      while(j != 0)
6      {
7         int carry = (~i) & j;
8         i = i ^ j;
9         j = carry << 1;
10      }
11      return i;
12   }
13   public static void main(String[] args)
14   {
15      int a = 23, b = 10;
16      System.out.println("a - b is " + subtractNumber(a, b));
17   }
18}