Java Integer bitCount() method
The bitCount() method of Integer class of java.lang package returns the count of set bits in a positive number. For negative numbers it returns count of set bits in it’s two’s complement form. 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 set bits in a positive number.
For negative numbers it returns count of set bits in it's 2's complement form.
Example 01 : 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
Example 02 : To show working of bitCount() method.
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
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