BitSet in Scala

A set is a collection which only contains unique items which are not repeatable. A BitSet is a collection of small integers as the bits of a larger integer. Non negative integers sets which represented as array of variable-size of bits packed into 64-bit words is called BitSets. The largest number stored in bitset is the memory of a bitset. It extends Set trait.

Syntax:

var BS : BitSet = BitSet(element1, element2, element3, ....)  

Where BS is the name of created BitSet

In Scala, BitSet have two versions: scala.collection.immutable.BitSet and scala.collection.mutable.BitSet. They are almost identical but the mutable version changes the bits in place so immutable data structures are much better for concurrency.

Operations perform with BitSet

Initialize a BitSet : Below is the example to create or initialize BitSet.

Example :

// Scala program to initialize a BitSet
import scala.collection.immutable.BitSet

// Creating object
object GFG
{
    // Main method
    def main(args:Array[String])
    {
        println("Initialize a BitSet")

        // Creating HashSet
        val bitSet: BitSet = BitSet(0, 1, 2, 3)
        println(s"Elements are = $bitSet")
    }
}

Output:

Initialize a BitSet
Elements are = BitSet(0, 1, 2, 3)

Check specific elements in BitSet :

Example :

// Scala program of Check specific elements in BitSet
import scala.collection.immutable.BitSet

// Creating object
object GFG
{
    // Main method
    def main(args:Array[String])
    {
        println("Initialize a BitSet")

        // Creating BitSet
        val bitSet: BitSet = BitSet(0, 1, 2, 3)
        println(s"Elements are = $bitSet")

        // Checking
        println(s"Element 2 = ${bitSet(2)}")
        println(s"Element 4 = ${bitSet(4)}")
    }
}

Output:

Initialize a BitSet
Elements are = BitSet(0, 1, 2, 3)
Element 2 = true
Element 4 = false

Adding an elements in BitSet : We can add an element in BitSet by using + sign. below is the example of adding an element in BitSet.

Example :

// Scala program of adding an element in BitSet
import scala.collection.immutable.BitSet

// Creating object
object GFG
{
    // Main method
    def main(args:Array[String])
    {
        println("Initialize a BitSet")

        // Creating BitSet
        val bs: BitSet = BitSet(0, 1, 2, 3)
        println(s"Elements are = $bs")

        // Adding an element in BitSet
        val bs1: BitSet = bs + 10 + 11
        println(s"Adding elements to BitSet = $bs1")
    }
}

Output:

Initialize a BitSet
Elements are = BitSet(0, 1, 2, 3)
Adding elements to BitSet = BitSet(0, 1, 2, 3, 10, 11)

Adding more than one element in BitSet : We can add more than one element in BitSet by using ++ sign. below is the example of adding more than one elements in BitSet.

Example :

// Scala program of adding more elements in BitSet
import scala.collection.immutable.BitSet

// Creating object
object GFG
{
    // Main method
    def main(args:Array[String])
    {
        println("Initialize a BitSet")

        // Creating BitSet
        val bs: BitSet = BitSet(0, 1, 2, 3)
        println(s"Elements are = $bs")

        // Adding elements in BitSet
        val bs1: BitSet = bs ++ BitSet(4, 5, 6)
        println(s"Add more than one elements to BitSet = $bs1")
    }
}

Output:

Initialize a BitSet
Elements are = BitSet(0, 1, 2, 3)
Add more than one elements to BitSet  = BitSet(0, 1, 2, 3, 4, 5, 6)

Remove element in BitSet : We can remove an element in BitSet by using – sign. below is the example of removing an element in BitSet.

Example :

// Scala program of removing element in BitSet
import scala.collection.immutable.BitSet

// Creating object
object GFG
{
    // Main method
    def main(args:Array[String])
    {
        println("Initialize a BitSet")

        // Creating BitSet
        val bs: BitSet = BitSet(0, 1, 2, 3)
        println(s"Elements are = $bs")

        // removing elements in BitSet
        val bs1: BitSet = bs - 2
        println(s"remove element from bitset = $bs1")
    }
}

Output:

Initialize a BitSet
Elements are = BitSet(0, 1, 2, 3)
remove element from bitset = BitSet(0, 1, 3)

Find the intersection between two BitSets : We can find intersection between two BitSets by using & sign. below is the example of finding intersection between two BitSets.

Example :

// Scala program of finding the intersection between two BitSets
import scala.collection.immutable.BitSet

// Creating object
object GFG
{
    // Main method
    def main(args:Array[String])
    {
        println("Initialize two BitSets")

        // Creating two BitSet
        val bs: BitSet = BitSet(0, 1, 2, 3)
        println(s"Elements of bitset1 are = $bs")

        val bs1: BitSet = BitSet(4, 5, 3, 6)
        println(s"Elements of bitset2 are = $bs1")

        // finding the intersection between two BitSets
        println(s"Intersection of bitSet1 and bitSet2 = ${bs & bs1}")
    }
}

Output:

Initialize two BitSets
Elements of bitset1 are = BitSet(0, 1, 2, 3)
Elements of bitset2 are = BitSet(3, 4, 5, 6)
Intersection of bitSet1 and bitSet2 = BitSet(3)

Initializing an empty BitSet :

Example :

// Scala program of Initializing an empty BitSet
import scala.collection.immutable.BitSet

// Creating object
object GFG
{
    // Main method
    def main(args:Array[String])
    {
        // Initializing an empty BitSet
        val emptyBitSet: BitSet = BitSet.empty
        println(s"Empty BitSet = $emptyBitSet")
    }
}

Output:

Empty BitSet = BitSet()