public static void main(String args[]){
        CountBits cb = new CountBits();
        System.out.println(cb.countBits(3636363));
        System.out.println(cb.countBitsFaster(3636363));
        System.out.println(cb.countBitsEvenFaster(3636363));
    }
http://www.geeksforgeeks.org/count-set-bits-in-an-integer/
src/com/interview/bits/CountBits.java