Java BigInteger bitCount() Method

The bitCount() method of Java BigInteger class is used to count the number of set bits. This method returns the number of bits in the two's complement representation of this BigInteger that differ from the sign bit of this BigInteger.

Syntax:

Returns:

This method returns number of bits that differ from this BigInteger's sign bit.

Note:
This method returns number of set bits if this BigInteger value is positive.
This method returns number of reset bits if this BigInteger value is negative.

Example

import java.math.BigInteger;  
  
public class BigIntegerBitCountExample {  
public static void main(String[]  args){  
// create  2  BigInteger objects  
 BigInteger   big1,big2 ;  
// create  2 int  objects  
int i1,i2 ;  
  
// assign values to big1, big2  
big1= new BigInteger("7");  // 0111  
big2 =new BigInteger("-7");  // 1001  
  
//perform bitCount  operation on big1,  big2  
i1 = big1.bitCount();   //total no of  set bits or 1's  
i2 = big2.bitCount();   //total no of  set bits or 1's  
  
String str1="Result of  bitCount operation  on "+ big1+" is "+ i1;  
String str2="Result of  bitCount operation  on "+ big2+" is"+ i2;  
System.out.println(str1);     
System.out.println(str2);     
}  
}  

Test it Now

Output:

Result of bitCount operation on 7 is 3
Result ofbitCount operation on -7 is 2

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