Scala 不可变 TreeSet –() 方法

在 Scala 不可变TreeSet class中， –()方法用于将一个 TreeSet 的元素减去另一个 TreeSet。

Method Definition: def –(that: IterableOnce[A]): TreeSet[A]

Return Type: It returns a new TreeSet which contains the element from A – B TreeSets.

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 TreeSets
        val t1 = TreeSet("g", "e", "e", "k", "s") 
          
        val t2 = TreeSet("a", "e", "i", "o", "u")
          
        // Print the TreeSets
        println(t1) 
          
        println(t2)
          
        // Applying --() method  
        val result = t1 -- t2
          
        // Display output 
        print("Combined TreeSet: " + result) 
           
    } 
} 

输出：

TreeSet(e, g, k, s)
TreeSet(a, e, i, o, u)
Combined TreeSet: TreeSet(g, k, s)

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 TreeSets
        val t1 = TreeSet(1, 6, 3, 2, 5) 
          
        val t2 = TreeSet(2, 1, 5, 4, 1)
          
        // Print the TreeSets
        println(t1) 
          
        println(t2)
          
        // Applying --() method  
        val result = t1 -- t2
          
        // Display output 
        print("Combined TreeSet: " + result) 
           
    } 
} 

输出：

TreeSet(1, 2, 3, 5, 6)
TreeSet(1, 2, 4, 5)
Combined TreeSet: TreeSet(3, 6)