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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