题解 | 二进制数1-Java

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        long x = scanner.nextLong();
        // 使用Long类的bitCount方法计算二进制中1的数量
        int count = Long.bitCount(x);

        System.out.println(count);
    }
}