Java BitSet | intersects()

BitSet is a class defined in the java.util package. It creates an array of bits represented by 0s and 1s.

Syntax

public boolean intersects(BitSet set)

Parameter: The method accepts a mandatory parameter set, which is the BitSet to be checked for intersection. 

Returns: The method returns a boolean indicating whether this BitSet intersects the specified BitSet.

Explanation: The method returns true if the specified BitSet has any bits set to true that are also set to true in this BitSet, otherwise false is returned.

Examples:

Input : 
set1 : {1, 2, 4}
set2 : {}

Output : 
false

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 intersects on two bitset
        System.out.println("bs1 intersection bs3 = "
                           + bs1.intersects(bs2));
        System.out.println("bs3 intersection bs1 = "
                           + bs3.intersects(bs1));
    }
}

Output:

bs1 : {0, 1, 2, 4}
bs2 : {1, 2, 3, 4, 5, 6}
bs3 : {}
bs1 intersection bs3 = true
bs3 intersection bs1 = false