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Scala Stack apply()用法及代碼示例


在 Scala Stack class,則使用apply()方法返回堆棧中給定位置的元素。堆棧的頂部對應於第0位的元素,依此類推。

函數定義: def apply(idx: Int): A

返回類型: It returns an element at a given position in the stack.



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

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


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