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Java Integer bitCount() method
  • Difficulty Level : Medium
  • Last Updated : 05 Dec, 2018

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 :To show working of java.lang.Integer.bitCount() method.




// 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

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