Integer.bitCount() method in Java
In Java, the bitCount() method is a static method of the Integer wrapper class. It returns the total number of one bit in two’s complement binary representation of the given integer value. However, if the value is a character, it will return the number of one bit in the binary equivalent of the ASCII value of that character.
Method signature:
The signature for the bitCount() method is as shown below. As, this is a static method, this is called with a class name.
Integer.bitCount(i)
Method parameters and return type:
- Here, the bitCount() method takes an integer as a parameter.
- However, it returns an int value as a count.
Java Integer bitCount Examples:
Example 1:In this example, we are initializing the int variable with a positive value. Thereafter, we are counting the number of one bit in its binary equivalent.
public class Main
{
public static void main(String[] args) {
// Initializing
int i=7;
// Printing the bit count along with binary equivalent of the int value
System.out.println("Binary Equivalent of 7 is 0111. So, bit count is "+Integer.bitCount(i));
}
}
Output
Binary Equivalent of 7 is 0111. So, bit count is 3
Example:
In this example, we are initializing the int variable with a negative value. Thereafter, we are counting the number of one bit in its binary equivalent.
public class Main
{
public static void main(String[] args)
{
// Initializing with negative value
int i=-7;
// Printing the bit count along with binary equivalent of the int value
System.out.println("Binary Equivalent of "+i+" is "+Integer.toBinaryString(i)+" So, bit count is "+Integer.bitCount(i));
}
}
Output
Binary Equivalent of -7 is 11111111111111111111111111111001 So, bit count is 30
Example:
In this case, we are initializing the int variable with a char value. So, its ASCII value is stored in the int variable. Thereafter, we are counting the number of one bit in its binary equivalent.
public class Main
{
public static void main(String[] args)
{
// Initializing int variable with char value
int i='A';
// Printing the bit count along with binary equivalent of the int value
System.out.println("Binary Equivalent of "+i+" is "+Integer.toBinaryString(i)+" So, bit count is "+Integer.bitCount(i));
}
}
Output
Binary Equivalent of 65 is 1000001 So, bit count is 2
Conclusion
Hence, the bitCount() method returns the total number of one bit in a binary equivalent of the given number.
References
Happy Learning 🙂
