Number of 1 Bits

/*Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight).

For example, the 32-bit integer ’11' has binary representation 00000000000000000000000000001011, so the function should return 3.
 */public class Numberof1Bits {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println(hammingWeight(11));
    }

    public static int hammingWeight(int n) {
        String str = Integer.toBinaryString(n);
        char[] ch = str.toCharArray();
        int count = 0;
        for (int i = 0; i < ch.length; i++) {
            if (ch[i] == 49)
                count++;
        }

        return count;
    }
}