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() methodimport 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
