Scala Map isEmpty() 方法与示例

isEmpty()方法用于检查给定的地图是否为空。

Method Definition: def isEmpty: Boolean

Return Type: It returns true if the stated map is empty else returns false.

示例 #1：

// Scala program of isEmpty()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating map
        val m1 = Map(3 -> "geeks", 1 -> "for", 2 -> "cs", 3 -> "geeks")
          
        // Applying isEmpty method 
        val result = m1.isEmpty
          
        // Displays output
        println(result)
    }
}

输出：

false

示例 #2：

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

输出：

true