Scala TreeSet +() method with example Last Updated : 03 Nov, 2019 Comments Improve Suggest changes Like Article Like Report 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 // 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 // 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) Comment More infoAdvertise with us Next Article Scala TreeSet +() method with example R rupesh_rao Follow Improve Article Tags : Scala Scala Scala-Method scala-collection Similar Reads Scala TreeSet ++() method with example In Scala TreeSet class, the ++() method is utilized to add elements of one TreeSet to another TreeSet. Method Definition: def ++(that: IterableOnce[A]): TreeSet[A] Return Type: It returns a new TreeSet which contains all the element from both the given TreeSets. Example #1: Scala // Scala program of 2 min read Scala TreeSet -() method with example In Scala TreeSet class, the -() method is utilized to remove an element from the given TreeSet. Method Definition: def -(elem: A): TreeSet[A] Return Type: It returns a new TreeSet with an element removed from the given TreeSet. Example #1: Scala // Scala program of -() // method // Import TreeSet im 1 min read Scala Set +() method with example The +() method is utilized to create a new set with an additional element unless the element is already present. Method Definition: def +(elem: A): Set[A] Return Type: It returns a new set with an additional element unless the element is already present. Example #1: Scala // Scala program of +() // 1 min read Scala Set ++() method with example The ++() method is utilized to add elements of one set to another set. Method Definition: def ++(elems: A): Set[A] Return Type: It returns a new set containing elements of both the sets. Example #1: Scala // Scala program of ++() // method // Creating object object GfG { // Main method def main(args 1 min read Scala Set -() method with example The -() method is utilized to creates a new set with a given element removed from the set. Method Definition: def -(elem: A): Set[A] Return Type: It returns a new set with a given element removed from the set. Example #1: Scala // Scala program of -() // method // Creating object object GfG { // Mai 1 min read Like