Scala List apply() 方法与示例

apply()方法用于通过索引选择列表中的元素。

Method Definition: def apply(n: Int): A

Return Type: It returns an element from the given list by its index which is present in the apply method as argument.

示例 #1：

// Scala program of apply()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a list
        val m1 = List(1, 3, 5, 2)
          
        // Applying apply method
        val res = m1.apply(3)
          
        // Displays output
        println(res)
      
    }
}

输出：

2

示例 #2：

// Scala program of apply()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a list
        val m1 = List(1, 3, 5, 2)
          
        // Applying apply method
        val res = m1.apply(0)
          
        // Displays output
        println(res)
      
    }
}

输出：

1