查找输入整数二进制中1的个数

import java.util.Scanner;

public class Main {

    private int findNumberOf1( int num) {
        int count = 0;
        while (num != 0) {
            if ((num & 1) == 1) count++;
            num = num >>> 1;
        }
        return count;
    } 
    public Main() {
        Scanner in = new Scanner(System.in);
        while (in.hasNextInt()) {
            int num = in.nextInt();
            int res = findNumberOf1(num);
            System.out.println(res);
        }
    }

    public static void main(String[] args) {
        Main solution = new Main();
    }
}