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Java.util.BitSet class in Java with Examples | Set 1

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

Constructors: 

 BitSet class Constructors
    /                  \ 
 BitSet()          BitSet(int no_Of_Bits)




// Java program illustrating Bitset Class constructors.
import java.util.*;
public class GFG
{
    public static void main(String[] args)
    {
        // Constructors of BitSet class
        BitSet bs1 = new BitSet();
        BitSet bs2 = new BitSet(6);
 
        /* 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);
    }
}

Output: 

bs1 : {0, 1, 2, 4}
bs2 : {1, 2, 3, 4, 5, 6}

Important Points :  

What happens if the array index in bitset is set as Negative?

The program will throw java.lang.NegativeArraySizeException 




// Java program illustrating Exception when we access
// out of index in BitSet class.
import java.util.*;
 
public class GFG
{
    public static void main(String[] args)
    {
        // Constructors of BitSet class
        BitSet bs1 = new BitSet();
 
        // Negative array size
        BitSet bs2 = new BitSet(-1);
 
        /* set is BitSet class method
           explained in next articles */
        // assigning values to bitset 1
        bs1.set(0);
        bs1.set(1);
 
        // assign values to bs2
        bs2.set(4);
        bs2.set(6);
 
        System.out.println("bs1  : " + bs1);
        System.out.println("bs2  : " + bs2);
    }
}

Output: 

Exception in thread "main" java.lang.NegativeArraySizeException: nbits < 0: -1
    at java.util.BitSet.(BitSet.java:159)
    at GFG.main(NewClass.java:9)

BitSet class methods in Java with Examples | Set 2

 


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