Scala 不可变 TreeSet -() 方法

在 Scala 不可变TreeSet class中，使用-()方法从给定的 TreeSet 中删除元素。

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

Return Type: It returns a new TreeSet with an element removed from the given TreeSet.

示例 #1：

// Scala program of -() 
// method 
  
// Import TreeSet
import scala.collection.immutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating TreeSet
        val t1 = TreeSet("a", "e", "i", "o", "u") 
          
        // Print the TreeSet
        println(t1) 
          
        // Applying -() method  
        val result = t1 - ("u")
          
        // Display output 
        print("After removing an element: " + result) 
           
    } 
} 

输出：

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

示例 #2：

// Scala program of -() 
// method 
  
// Import TreeSet
import scala.collection.immutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating TreeSet
        val t1 = TreeSet(2, 1, 5, 4, 1, 3) 
          
        // Print the TreeSet
        println(t1) 
          
        // Applying -() method  
        val result = t1 - (1)
          
        // Display output 
        print("After removing an element: " + result) 
           
    } 
} 

输出：

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