Scala Stack count()方法与实例
在Scala Stack类中, count() 方法被用来计算堆栈中满足给定谓词的元素的数量。
方法定义: def count(p: (A) => Boolean):Int
返回类型。它返回堆栈中满足给定谓词的元素的数量。
例子 #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
例子#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
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