Java.lang.Integer.bitCount() Method

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Description

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

Declaration

Following is the declaration for java.lang.Integer.bitCount() method

public static int bitCount(int i)

Parameters

  • i -- This is the int value.

Return Value

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

Exception

  • NA

Example

The following example shows the usage of java.lang.Integer.bitCount() method.

package com.tutorialspoint;

import java.lang.*;

public class IntegerDemo {

   public static void main(String[] args) {

     int i = 255;
     System.out.println("Number = " + i);
    
     /* returns the string representation of the unsigned integer value 
     represented by the argument in binary (base 2) */
     System.out.println("Binary = " + Integer.toBinaryString(i));

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

Let us compile and run the above program, this will produce the following result:

Number = 170
Binary = 10101010
Number of one bits = 4



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