Scala Stack count()用法及代码示例

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

函数定义: def count(p: (A) => Boolean): Int

返回类型: It returns the count the number of elements in the stack that satisfies a given predicate.

范例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

范例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

相关用法

注：本文由纯净天空筛选整理自rupesh_rao大神的英文原创作品 Scala Stack count() method with example。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。