Scala 不可变 TreeSet forall() 方法

在 Scala 不可变TreeSet class中，使用forall()方法来检查谓词是否对 TreeSet 的所有元素都成立。

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

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

示例 #1：

// Scala program of forall() 
// method 
  
// Import TreeSet
import scala.collection.immutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating TreeSet
        val t1 = TreeSet(2, 4, 6, 7, 8, 9) 
          
        // Print the TreeSet
        println(t1) 
          
        // Applying forall() method  
        val result = t1.forall(x => {x % 7 == 0})
          
        // Displays output 
        println("All the elements are divisible by 7: " + result)
          
    } 
} 

输出：

TreeSet(2, 4, 6, 7, 8, 9)
All the elements are divisible by 7: false

示例 #2：

// Scala program of forall() 
// method 
  
// Import TreeSet
import scala.collection.immutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating TreeSet
        val t1 = TreeSet(2, 4, 6, 8) 
          
        // Print the TreeSet
        println(t1) 
          
        // Applying forall() method  
        val result = t1.forall(x => {x % 2 == 0})
          
        // Displays output 
        println("All the elements are even: " + result)
          
    } 
} 

输出：

TreeSet(2, 4, 6, 8)
All the elements are even: true