Scala Queue filter() 方法示例

filter()方法用于返回一个新队列，该队列由满足给定谓词的所有元素组成。

Method Definition: def filter(pred: (A) => Boolean): Queue[A]

Return Type: It returns a new queue that consists of all the elements that satisfy a given predicate.

示例 #1：

// Scala program of filter() 
// method 
  
// Import Queue  
import scala.collection.mutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating queues 
        val q1 = Queue(1, 3, 2, 7, 6, 5) 
          
        // Print the queue
        println(q1)
          
        // Applying filter method 
        val result = q1.filter(x => {x % 2 == 1}) 
          
        // Displays output 
        print("Odd elements: " + result)
    } 
} 

输出：

Queue(1, 3, 2, 7, 6, 5)
Odd elements: Queue(1, 3, 7, 5)

示例 #2：

// Scala program of filter() 
// method 
  
// Import Queue  
import scala.collection.mutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating queues 
        val q1 = Queue(1, 3, 2, 7, 6, 5) 
          
        // Print the queue
        println(q1)
          
        // Applying filter method 
        val result = q1.filter(x => {x % 3 == 0}) 
          
        // Displays output 
        print("Elements divisible by 3: " + result)
    } 
} 

输出：

Queue(1, 3, 2, 7, 6, 5)
Elements divisible by 3: Queue(3, 6)