Java BitSet intersects() method

The intersects(BitSet set) method of Java BitSet class returns Boolean value true or false on the basis of whether parameter BitSet has intersected with this BitSet or not. It returns true if the specified BitSet set is also true in this BitSet.

Syntax:

Parameter:

DataType	Parameter	Description
BitSet	set	It is a BitSet set which is to intersect.

Returns:

It returns a Boolean value true or false on the basis of whether parameter BitSet has intersected with this BitSet or not.

Exception:

NullPointerException - If null parameter will pass in the method.

Compatibility Version:

Java 1.4 and above

Example 1

import java.util.BitSet;

public class BitSetEntersectsExample1 {
	public static void main(String[] args) {
		BitSet bitset1 = new BitSet(5);
		BitSet bitset2 = new BitSet(5);
		BitSet bitset3 = new BitSet(5);
		
		bitset1.set(1);
		bitset1.set(2);
		bitset1.set(3);
		bitset1.set(4);
		
		bitset2.set(1);
		bitset2.set(2);
		bitset2.set(6);
		bitset2.set(7);
		
		bitset3.set(5);
		bitset3.set(6);
		bitset3.set(7);
		bitset3.set(8);
		System.out.println("bitset1: "+bitset1);
		System.out.println("bitset2: "+bitset2);
		System.out.println("bitset3: "+bitset3);
		//returns true as 1 and 2 bit true
		boolean b1 = bitset1.intersects(bitset2);
		//returns false as no bit matches
		boolean b2 = bitset1.intersects(bitset3);
		System.out.println("intersected result between bitset1 and bitset2: "+b1);
		System.out.println("intersected result between bitset1 and bitset3: "+b2);
	}
}

Output:

bitset1: {1, 2, 3, 4}
bitset2: {1, 2, 6, 7}
bitset3: {5, 6, 7, 8}
intersected result between bitset1 and bitset2: true
intersected result between bitset1 and bitset3: false

Example 2

This method throws a NullPointerException if we pass a null parameter.

import java.util.BitSet;

public class BitSetEntersectsExample2 {
	public static void main(String[] args) {
		BitSet bitset = new BitSet(5);
		
		bitset.set(1);
		bitset.set(2);
		bitset.set(3);
		bitset.set(4);
				
		System.out.println("bitset: "+bitset);
		// perform andNot operation between bitset and null throw exception
		boolean b = bitset.intersects(null);
		System.out.println("intersected result between bitset and null: "+b);
	}
}

Output:

Exception in thread "main" java.lang.NullPointerException
	at java.util.BitSet.intersects(Unknown Source)
	at BitSetEntersectsExample2.main(BitSetEntersectsExample2.java:14)
bitset1: {1, 2, 3, 4}

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