Scala Stack apply() 方法与示例

在 Scala Stack class中， apply()方法用于返回堆栈中给定位置的元素。堆栈的顶部对应于第0^个位置的元素，依此类推。

Method Definition: def apply(idx: Int): A

Return Type: It returns an element at a given position in the stack.

示例 #1：

// Scala program of apply() 
// method 
   
import scala.collection.mutable.Stack 
   
// 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 apply method    
        val result = s1.apply(0)
           
        // Display output
        println("Element at 0th position: " + result) 
   
    } 
} 

输出：

Stack(1, 2, 3, 4, 5)
Element at 0th position: 1

示例 #2：

// Scala program of apply() 
// method 
   
import scala.collection.mutable.Stack 
   
// Creating object 
object GfG 
{ 
       
    // Main method 
    def main(args:Array[String]) 
    { 
           
        // Creating a stack
        val s1 = Stack("C++", "Java", "Python", "Scala") 
           
        // Print the stack
        println(s1)
       
        // Applying apply method    
        val result = s1.apply(2)
           
        // Display output
        println("Element at 2nd position: " + result) 
   
    } 
} 

输出：

Stack(C++, Java, Python, Scala)
Element at 2nd position: Python