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Java Integer bitCount() Method

By Chaitanya Singh | Filed Under: java

The bitCount() method of Java Integer class returns the number of 1’s bits in the two’s complement representation of the given integer value.

public class JavaExample {
  public static void main(String args[])
  {
    int i = 24;
    // binary equivalent of 24 is: 11000
    System.out.println(Integer.toBinaryString(i));
    System.out.println(Integer.bitCount(i));
  }
}

Output:

11000
2

Syntax of bitCount() method

public static int bitCount(int i)

bitCount() Parameters

  • i: An integer number

bitCount() Return Value

  • The bitCount() method has int return type. It returns the number of 1’s bits in the two’s complement representation of the given integer number. This process of counting 1’s in a binary number is also known as population count.

Example 1

public class JavaExample {
  public static void main(String args[])
  {
    int i = 50;
    // binary equivalent of 50 is: 110010
    System.out.println(Integer.toBinaryString(i));
    System.out.println(Integer.bitCount(i));
  }
}

Output:

Java Integer bitCount Example Output1

Example 2

import java.util.Scanner;
public class JavaExample {
  public static void main(String[] args) {
    int i;
    Scanner scan = new Scanner(System.in);
    System.out.print("Input an integer number: " );
    i = scan.nextInt();
    System.out.println("Entered number is: "+i);
    // Entered number binary conversion
    System.out.println("Binary equivalent: "+
            Integer.toBinaryString(i));
    // Print 1's count
    System.out.println("Number of 1's in input number: "+
            Integer.bitCount(i));
  }
}

Output:

Java Integer bitCount Example Output2

Example 3

public class JavaExample {
  public static void main(String args[])
  {
    int i = Integer.MAX_VALUE;
    int i2 = Integer.MIN_VALUE;
    System.out.println(Integer.toBinaryString(i));
    System.out.println(Integer.bitCount(i));
    System.out.println(Integer.toBinaryString(i2));
    System.out.println(Integer.bitCount(i2));
  }
}

Output:

Java Integer bitCount Example Output3

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