package com.ming.test/** * scala泛型 * 类型参数测试 */object TypeParamsTest {    //泛型函数  def getMiddle[T](a:Array[T])=a(a.length/2)     //类型通配符  def process1(people:java.util.List[_<:Student])={}    def main(args: Array[String]): Unit = {    val p=new Pair(42,"String")    val p2=new Pair[Any,Any](42,"ddd")        val c=new Compare("A","B");    println(c.smaller)  }  }//定义一个类型参数的类class Pair[T,M](var one:T,var two :M)//T必须是Comparable[T]的子类型.class Compare[T<:Comparable[T]](val one:T,val two : T){  def smaller=if(one.compareTo(two)<0) one else two}//视图界定/** * <%关系意味这T可以被隐式转换成Comparable[T],还可以用Ordered特质 */class PairT[T <% Comparable[T]]class PairTT[T <% Ordered[T]](val one:T,val two:T){  def smaller=if(one
     
      : String <:String]abstract class List[+T]{  def isEmpty :Boolean  def head :T  def tail: List[T]}object Empty extends List[Nothing]{  def isEmpty=true  def head=throw new UnsupportedOperationException  def tail=throw new UnsupportedOperationException}class Student{}
     

 

scala的泛型比java的要复杂点