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BitSet isEmpty() method in Java
  • Last Updated : 28 Aug, 2018

BitSet is a class defined in the java.util package. It creates an array of bits represented by boolean values.

Prerequisite : Java BitSet | Set 1

Bitset.isEmpty()
This method is used to check if there are any bits that are set to true, in the specified BitSet. This method returns true if this BitSet contains no bits that are set to true.

Syntax:

public boolean isEmpty()

Return Value: This method returns true if this BitSet contains no bits that are set to true. Otherwise it returns false.



Below program illustrate the isEmpty() method BitSet:




// Java program illustrating Bitset
// isEmpty() function.
  
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
        expalined 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 isEmpty on bitsets
        System.out.println("Is bs1 empty : "
                           + bs1.isEmpty());
        System.out.println("Is bs2 empty : "
                           + bs2.isEmpty());
        System.out.println("Is bs3 empty : "
                           + bs3.isEmpty());
    }
}


Output:

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

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