Java.math.BigInteger.bitCount() Method

---

---

Description

The java.math.BigInteger.bitCount() returns the number of bits in the two's complement representation of this BigInteger that differ from its sign bit. This method is useful when implementing bit-vector style sets atop BigIntegers.

Declaration

Following is the declaration for java.math.BigInteger.bitCount() method.

public int bitCount()

Parameters

NA

Return Value

This method returns number of bits in the two's complement representation of this BigInteger that differ from its sign bit.

Exception

NA

Example

The following example shows the usage of math.BigInteger.bitCount() method.

package com.tutorialspoint;

import java.math.*;

public class BigIntegerDemo {

   public static void main(String[] args) {

      // create 2 BigInteger objects
      BigInteger bi1, bi2;  

      // create 2 int objects
      int i1, i2;
	
      // assign values to bi1, bi2
      bi1 = new BigInteger("7"); 
      bi2 = new BigInteger("-7"); 

      // perform bitcount operation on bi1, bi2
      i1 = bi1.bitCount();
      i2 = bi2.bitCount();
	  
      String str1 = "Result of bitcount operation on " + bi1 +" is " +i1;
      String str2 = "Result of bitcount operation on " + bi2 +" is " +i2;

      // print i1, i2 values
      System.out.println( str1 );
      System.out.println( str2 );
   }
}

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

Result of bitcount operation on 7 is 3
Result of bitcount operation on -7 is 2