Scala TreeSet +() method with example

In Scala TreeSet class, the +() method is utilized to add an element to the TreeSet unless it is already present.

Method Definition: def +(elem: A): TreeSet[A]

Return Type: It returns a new TreeSet with an additional element unless the element is already present.

Example #1:

// Scala program of +()
// method

// Import TreeSet
import scala.collection.mutable._

// Creating object
object GfG
{

    // Main method
    def main(args:Array[String])
    {

        // Creating TreeSets
        val t1 = TreeSet("a", "e", "i", "o")

        // Print the TreeSets
        println(t1)

        // Applying +() method
        val result = t1 + ("u")

        // Display output
        print("After adding an element: " + result)

    }
}

Output:

TreeSet(a, e, i, o)
After adding an element: TreeSet(a, e, i, o, u)

Example #2:

// Scala program of +()
// method

// Import TreeSet
import scala.collection.mutable._

// Creating object
object GfG
{

    // Main method
    def main(args:Array[String])
    {

        // Creating TreeSets
        val t1 = TreeSet(2, 1, 5, 4, 1)

        // Print the TreeSets
        println(t1)

        // Applying +() method
        val result = t1 + (3)

        // Display output
        print("After adding an element: " + result)

    }
}

Output:

TreeSet(1, 2, 4, 5)
After adding an element: TreeSet(1, 2, 3, 4, 5)