The bitCount() method of Integer class of java.lang package returns the count of the number of one-bits in the two’s complement binary representation of an int value. This function is sometimes referred to as the population count.
Syntax :
public static int bitCount(int n) Parameter : n : the value whose bits are to be counted Return : This method returns the count of the number of one-bits in the two's complement binary representation of an int value.
Example 01 : To show working of java.lang.Integer.bitCount() method.
java
// Java program to demonstrate working // of java.lang.Integer.bitCount() method import java.lang.Integer;
class Gfg {
// driver code
public static void main(String args[])
{
int a = 10 ;
// Convert integer number to binary format
System.out.println(Integer.toBinaryString(a));
// to print number of 1's in the number a
System.out.println(Integer.bitCount(a));
}
} |
Output
1010 2
Example 02 : To show working of bitCount() method.
Java
import java.io.*;
class GFG {
public static void main(String[] args)
{
int num1 = 10 ; // binary representation: 1010
int num2 = - 10 ; // binary representation:
// 11111111111111111111111111110110
int result1 = Integer.bitCount(num1);
int result2 = Integer.bitCount(num2);
System.out.println( "Number of one-bits in num1: "
+ result1);
System.out.println( "Number of one-bits in num2: "
+ result2);
}
} |
Output
Number of one-bits in num1: 2 Number of one-bits in num2: 30