Java Long class

Java BitSet isEmpty() method

Last Updated : 17 Mar 2025

The isEmpty() method of Java BitSet class returns true if this BitSet does not contain any bits which are set to true.

Syntax:

Parameter:

Returns:

The isEmpty() method returns a Boolean value true or false on the basis of this BitSet is empty or not.

Exception:

Compatibility Version:

Java 1.4 or above

Example 1

import java.util.BitSet;

public class BitSetIsEmptyExample1 {
	public static void main(String[] args) {
		BitSet bitset1 = new BitSet(5);
		BitSet bitset2 = new BitSet(5);
		
		bitset1.set(1);
		bitset1.set(2);
		bitset1.set(3);
		bitset1.set(4);
				
		System.out.println("bitset1: "+bitset1);
		System.out.println("bitset2: "+bitset2);
		
		//returns false as bitset1 is not empty
		boolean b1 = bitset1.isEmpty();
		//returns true as bitset2 is empty
		boolean b2 = bitset2.isEmpty();
		
		System.out.println("bitset1 isEmpty: "+b1);
		System.out.println("bitset2 isEmpty: "+b2);
	}
}

Output:

bitset1: {1, 2, 3, 4}
bitset2: {}
bitset1 isEmpty: false
bitset2 isEmpty: true

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