Scala 不可变 TreeSet exists() 方法示例

在 Scala 不可变TreeSet class中， exists()方法用于检查谓词是否适用于 TreeSet 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 TreeSet or else returns false.

示例 #1：

// Scala program of exists() 
// method 
  
// Import TreeSet
import scala.collection.immutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating TreeSet
        val t1 = TreeSet(1, 3, 2, 7, 6, 5) 
          
        // Print the TreeSet
        println(t1) 
          
        // Applying exists() method  
        val result = t1.exists(x => {x % 7 == 0})
          
        // Displays output 
        println("Element divisible by 7 exists: " + result)
          
    } 
} 

输出：

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

示例 #2：

// Scala program of exists() 
// method 
  
// Import TreeSet
import scala.collection.immutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating TreeSet
        val t1 = TreeSet(1, 3, 2, 7, 6, 5) 
          
        // Print the TreeSet
        println(t1) 
          
        // Applying exists() method  
        val result = t1.exists(x => {x == 10})
          
        // Displays output 
        println("Element 10 exists: " + result)
          
    } 
} 

输出：

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