Java Integer bitCount() Method

// Java program to demonstrate working
// of java.lang.Integer.bitCount() method

import java.lang.Integer;

class Gfg {
    // driver code
    public static void main(String args[])
    {
        int a = 10;

        // Convert integer number to binary  format
        System.out.println(Integer.toBinaryString(a));

        // to print number of 1's in the number a
        System.out.println(Integer.bitCount(a));
    }
}

import java.io.*;

class GFG {
    public static void main(String[] args)
    {
        int num1 = 10; // binary representation: 1010
        int num2 = -10; // binary representation:
                        // 11111111111111111111111111110110

        int result1 = Integer.bitCount(num1);
        int result2 = Integer.bitCount(num2);

        System.out.println("Number of one-bits in num1: "
                           + result1);
        System.out.println("Number of one-bits in num2: "
                           + result2);
    }
}