Java Utility Library

Java BitSet - cardinality() Method

The java.util.BitSet.cardinality() method returns the number of bits set to true in the given BitSet.

Syntax

public int cardinality()

Parameters

No parameter is required.

Return Value

Returns the number of bits set to true in the given BitSet.

Exception

Example:

In the example below, the java.util.BitSet.cardinality() method is used to find the number of bits set to true in the given BitSet.

import java.util.*;

public class MyClass {
  public static void main(String[] args) {
    //creating a BitSet
    BitSet BSet = new BitSet();

    //populating the BitSet
    BSet.set(10);
    BSet.set(20);
    BSet.set(30);
    BSet.set(40);
    BSet.set(50); 

    //printing the BitSet
    System.out.println("BSet contains: " + BSet);

    //printing cardinality of the BitSet
    System.out.println("BSet cardinality: " + BSet.cardinality()); 
  }
}

The output of the above code will be:

BSet contains: {10, 20, 30, 40, 50}
BSet cardinality: 5

❮ Java.util - BitSet