Scala TreeSet count() 方法及示例

在Scala TreeSet类中， count() 方法用于计算满足给定谓词的TreeSet中元素的数量。

方法定义: def count(p: (A) => Boolean): Int

返回类型: 返回满足给定谓词的TreeSet中元素的数量。

示例1:

// Scala program of count() method 
// Import TreeSet
import scala.collection.mutable._
// Creating object 
object GfG 
{ 
  // Main method
  def main(args:Array[String]) 
  { 
    // Creating TreeSet
    val t1 = TreeSet(2, 1, 3, 4, 5) 
    // Print the TreeSet
    println(t1) 
    // Applying count() method
    val result = t1.count(x => {x % 2 == 0})
    // Display output
    print("Number of even element in the TreeSet: " + result)  
  } 
} 

TreeSet(1, 2, 3, 4, 5)
Number of even element in the TreeSet: 2

示例2:

// Scala program of count() method 
// Import TreeSet
import scala.collection.mutable._
// Creating object 
object GfG 
{ 
  // Main method
  def main(args:Array[String]) 
  { 
    // Creating TreeSet
    val t1 = TreeSet(2, 1, 3, 4, 5) 
    // Print the TreeSet
    println(t1) 
    // Applying count() method
    val result = t1.count(x => {x % 2 != 0})
    // Display output
    print("Number of odd element in the TreeSet: " + result)   
  } 
} 

TreeSet(1, 2, 3, 4, 5)
Number of odd element in the TreeSet: 3

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