Java.lang.Long.bitCount() Method

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Description

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

Declaration

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

public static int bitCount(long i)

Parameters

i − This is the long value.

Return Value

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

Exception

NA

Example

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

package com.tutorialspoint;

import java.lang.*;

public class LongDemo {

   public static void main(String[] args) {

      long l = 219;
      System.out.println("Number = " + l);

      /* returns the string representation of the unsigned long value 
         represented by the argument in binary (base 2) */
      System.out.println("Binary = " + Long.toBinaryString(l));

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

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

Number = 219
Binary = 11011011
Number of one bits = 6