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package hfd
//泛型
//需求：你是一个程序员，老板让你写一个函数，用来获取列表中的中间元素
//List(1,2,3,4,5)==>中间元素的下标=长度/2 ===>3
//getMiddleEle
object Test38_5 {def print1():Unit={println(1)}def print2(): Unit = {println(2)}def print3(): Unit = {println(3)}
def print (n: Int): Unit = {println (n)}//定义函数的格式：//def 函数的名字（参数1：类型1）：返回值类型={//}//  def getMiddleEle1(list:List[Int]): Int =list(list.length/2)////  def getMiddleEle2(list: List[String]): String = list(list.length / 2)////  def getMiddleEle3(list: List[Double]):Double=list(list.length/2)//[T]就是泛型：类型参数化，把类型当做参数传入函数内部def getMiddleEle[T] (list: List[T] ): T = list (list.length / 2)def main (args: Array[String] ): Unit = {val rs1 = println (getMiddleEle (List (1, 2, 3, 4, 5) ) ) //3println (rs1)val rs2= println (getMiddleEle (List ("1", "2", "3", "4", "5") ) ) //3println (rs2)val rs3=println (getMiddleEle(List (1.2, 2.0, 2.9) ) ) //2.0println (rs3)}}