带有示例的 Scala TreeSet head() 方法

head()方法用于返回 TreeSet 的第一个元素。

Method Definition: def head: A

Return Type: It returns the first element of the TreeSet.

示例 #1：

// Scala program of head() 
// method 
  
// Import TreeSet
import scala.collection.mutable._
  
// 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 head() method  
        val result = t1.head
          
        // Displays output 
        println("First element of the TreeSet: " + result)
          
    } 
} 

输出：

TreeSet(1, 2, 3, 5, 6, 7)
First element of the TreeSet: 1

示例 #2：

// Scala program of head() 
// method 
  
// Import TreeSet
import scala.collection.mutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating TreeSet
        val t1 = TreeSet("a", "e", "i", "o", "u") 
          
        // Print the TreeSet
        println(t1)
         
        // Applying head() method  
        val result = t1.head
          
        // Displays output 
        println("First element of the TreeSet: " + result)
          
    } 
} 

输出：

TreeSet(a, e, i, o, u)
First element of the TreeSet: a