Scala Stack contains() 方法与示例

在 Scala Stack class中， contains()方法用于检查元素是否存在于 not 的堆栈中。

Method Definition: def contains(elem: A): Boolean

Return Type: It returns true if the element is present in the stack or else it returns false.

示例 #1：

// Scala program of contains() 
// 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 contains method    
        val result = s1.contains(10)
          
        // Display output
        println("Stack contains element 10: " + result) 
  
    } 
} 

输出：

Stack(1, 2, 3, 4, 5)
Stack contains element 10: false

示例 #2：

// Scala program of contains() 
// 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 contains method    
        val result = s1.contains("Scala")
          
        // Display output
        println("Stack contains element Scala: " + result) 
  
    } 
} 

输出：

Stack(C++, Java, Python, Scala)
Stack contains element Scala: true