BitSet in Scala

Last Updated : 04 Jul, 2019

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 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)

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 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 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 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:

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 :

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") 
    } 
} 