Java Integer bitCount() method

The bitCount() is a method of Integer class under java.lang package. It returns the number of one-bits in the two's complement binary representation of the specified int value. This function is sometimes referred to as the population count.

Syntax

Following is the declaration of bitCount() method:

Parameter:

DataType	Parameter	Description	Required/Optional
int	i	It is an integer value enter by user	Required

Returns:

The bitCount() method returns the number of one-bits in the two's complement binary representation of the specified int value.

Exceptions:

Compatibility Version:

Java 1.5 and above

Example 1

public class IntegerBitCountExample1 {
    public static void main(String args[])
    {
        int n = 35;
        // Conversion of integer number to binary  format
        System.out.println(Integer.toBinaryString(n));
        // Print number of 1's in the number n
        System.out.println(Integer.bitCount(n));
    }
}

Output:

100011
3

Example 2

public class IntegerBitCountExample2 {
    public static void main(String args[])
    {
        int n = 97 ;
        System.out.println("Entered Integer number is: " + n );
        // Conversion of integer number to binary  format
        System.out.println("Binary Conversion: " +Integer.toBinaryString(n));
        // print number of 1's in the number n
        System.out.println("Number of 1's bit are: " +Integer.bitCount(n));
    }
}

Output:

Entered Integer number is: 97
Binary Conversion: 1100001
Number of 1's bit are: 3

Example 3

import java.util.Scanner;
public class IntegerBitCountExample3 {
    public static void main(String[] args) {        
      Scanner sc = new Scanner(System.in);
      System.out.print("Ente the Integer value: " );
        int number = sc.nextInt();
        System.out.println("The number is: " + number);     
        // Conversion of integer number to binary  format
       System.out.println("Binary Conversion: " +Integer.toBinaryString(number));
        // print number of 1's in the number n
        System.out.println("Number of 1's bit are: " +Integer.bitCount(number));
    }
}

Output:

Enter the Integer value: 23
The input number is: 23
Binary Conversion: 10111
Number of 1's bit are: 4

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Java Integer bitCount() method

Syntax

Parameter:

Returns:

Exceptions:

Compatibility Version:

Example 1

Example 2

Example 3

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Java Integer bitCount() method

Syntax