Scala Map 迭代器方法与示例

迭代器方法用于给出一个迭代器。

Method Definition: def iterator: Iterator[(A, B)]

Return Type: It returns a non-empty iterator for non-empty map and returns an empty iterator for empty map.

示例 #1：

// Scala program of iterator
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a map
        val m1 = Map("geeks" -> 5, "for" -> 3, "cs" -> 2) 
          
        // Applying iterator method
        val result = m1.iterator
          
        // Displays output
        println(result)
      
    }
}

输出：

non-empty iterator

示例 #2：

// Scala program of iterator
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a map
        val m1 = Map() 
          
        // Applying iterator method
        val result = m1.iterator
          
        // Displays output
        println(result)
      
    }
}

输出：

empty iterator