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Scala List apply()用法及代码示例


apply()方法用于通过列表中的索引选择元素。

函数定义: def apply(n: Int): A

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



范例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

范例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


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