BitSet is a class defined in the java.util package. It creates an array of bits represented by 0s and 1s.
Syntax
public int cardinality()
Explanation:
The method returns the number of 1s in this BitSet.
Examples:
Input : set1 : {1, 2, 4} set2 : {} Output : 3 0
Java
// Java program illustrating Bitset Class functions. import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Constructors of BitSet class
BitSet bs1 = new BitSet();
BitSet bs2 = new BitSet();
BitSet bs3 = new BitSet();
/* set is BitSet class method
explained in next articles */
bs1.set( 0 );
bs1.set( 1 );
bs1.set( 2 );
bs1.set( 4 );
// assign values to bs2
bs2.set( 4 );
bs2.set( 6 );
bs2.set( 5 );
bs2.set( 1 );
bs2.set( 2 );
bs2.set( 3 );
// Printing the 2 Bitsets
System.out.println( "bs1 : " + bs1);
System.out.println( "bs2 : " + bs2);
System.out.println( "bs3 : " + bs3);
// Performing logical AND
// on bs2 set with bs1
System.out.println(bs1.cardinality());
System.out.println(bs2.cardinality());
System.out.println(bs3.cardinality());
}
} |
Output:
bs1 : {0, 1, 2, 4} bs2 : {1, 2, 3, 4, 5, 6} bs3 : {} 4 6 0
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