Scala Stack count() 方法示例

在 Scala Stack class中， count()方法用于计算堆栈中满足给定谓词的元素的数量。

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

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

示例 #1：

// Scala program of count() 
// method 
  
// Import Stack 
import scala.collection.mutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating a stack 
        val s1 = Stack(1, 2, 3, 4, 5) 
          
        // Print the stack 
        println(s1) 
          
        // Applying count method 
        val result = s1.count(z => true) 
          
        // Displays output 
        print("Number of element in stack: " + result) 
    } 
} 

输出：

Stack(1, 2, 3, 4, 5)
Number of element in stack: 5

示例 #2：

// Scala program of count() 
// method 
  
// Import Stack 
import scala.collection.mutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating a stack 
        val s1 = Stack(1, 2, 3, 4, 5) 
          
        // Print the stack 
        println(s1) 
          
        // Applying count method 
        val result = s1.count(z => {z % 2 == 0}) 
          
        // Displays output 
        print("Number of element in stack divisible by 2: " + result) 
    } 
} 

输出：

Stack(1, 2, 3, 4, 5)
Number of element in stack divisible by 2: 2