Scala Stack exists() 方法示例

在 Scala Stack class中， exists()方法用于检查谓词是否适用于堆栈的任何元素。

Method Definition: def exists(p: (A) => Boolean): Boolean

Return Type: It returns true if the predicate holds true for any of the elements of the stack or else returns false.

示例 #1：

// Scala program of exists() 
// method 
  
// Import Stack 
import scala.collection.mutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating stack  
        val s1 = Stack(1, 3, 2, 7, 6, 5)  
          
        // Print the stack
        println(s1)
            
        // Applying exists method  
        val result = s1.exists(x => {x % 7 == 0}) 
          
        // Display output
        println("Element divisible by 7 exists: " + result)
    } 
} 

输出：

Stack(1, 3, 2, 7, 6, 5)
Element divisible by 7 exists: true

示例 #2：

// Scala program of exists() 
// method 
  
// Import Stack 
import scala.collection.mutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating stack  
        val s1 = Stack(1, 3, 2, 7, 6, 5)  
          
        // Print the stack
        println(s1)
            
        // Applying exists method  
        val result = s1.exists(x => {x == 10}) 
          
        // Display output
        println("Element 10 exists: " + result)
    } 
} 

输出：

Stack(1, 3, 2, 7, 6, 5)
Element 10 exists: false