BitSet cardinality() in Java

cardinality(): This method is available in java.util.BitSet class of Java.

Syntax:

int java.util.BitSet.cardinality()

This method returns the number of bits set to true in this BitSet.

Parameters: NA

Returns: the number of bits set to true in this BitSet.

Exceptions: NA

Approach

Java

import java.util.BitSet;

public class BitSetcardinality {
    public static void main(String[] args) {
        BitSet bitSet = new BitSet(100);

        bitSet.set(1);

        bitSet.set(5);
        bitSet.set(6);
        bitSet.set(10);

        System.out.println(bitSet.cardinality());
    }
}

Output:

4