题解 | #查找输入整数二进制中1的个数#

直接调API：Integer.bitCount()

import java.util.Scanner;

/**
 * 【查找输入整数二进制中1的个数】
 *
 */
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        while (sc.hasNextInt()) {
            int nextInt = sc.nextInt();
            System.out.println(Integer.bitCount(nextInt));
        }
    }
}