Java Integer - bitCount() Method

The java.lang.Integer.bitCount() method 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

public static int bitCount(int i)

Parameters

Return Value

Returns the number of one-bits in the two's complement binary representation of the specified int value.

Exception

NA.

Example:

In the example below, the java.lang.Integer.bitCount() method returns the number of one-bits in the two's complement binary representation of the given int value.

import java.lang.*;

public class MyClass {
  public static void main(String[] args) {
    
    //creating int value
    int x = 135;

    //printing x
    System.out.println("The x is = " + x);     

    //printing the binary representation of x
    System.out.println("The x in binary is = " + Integer.toBinaryString(x)); 

    //printing the number of one-bits in x
    System.out.println("Number of one bits in x = " + Integer.bitCount(x)); 
  }
}

The output of the above code will be:

The x is = 135
The x in binary is = 10000111
Number of one bits in x = 4