Scala Queue count() 方法与示例

count() 方法用于计算队列中满足给定谓词的元素数。

Method Definition: def count(p: (A) => Boolean): Int

Return Type: It returns the count the number of elements in the queue that satisfies a given predicate.

示例 #1：

// Scala program of count() 
// method 
  
// Import Queue  
import scala.collection.mutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating a queue 
        val q1 = Queue(1, 2, 3, 4, 5) 
          
        // Print the queue
        println(q1)
          
        // Applying count method 
        val result = q1.count(z => true) 
          
        // Displays output 
        print("Number of element in queue: " + result)
    } 
} 

输出：

Queue(1, 2, 3, 4, 5)
Number of element in queue: 5

示例 #2：

// Scala program of count() 
// method 
  
// Import Queue  
import scala.collection.mutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating a queue 
        val q1 = Queue(1, 2, 3, 4, 5) 
          
        // Print the queue
        println(q1)
          
        // Applying count method 
        val result = q1.count(z => {z % 2 == 0}) 
          
        // Displays output 
        print("Number of element in queue divisible by 2: " + result)
    } 
} 

输出：

Queue(1, 2, 3, 4, 5)
Number of element in queue divisible by 2: 2