学习scala笔记--25 类型参数--泛型类 泛型函数

 

 

 

 

scala  类型参数

 

用参数限定类型

 

 

泛型类 

 

 

 

 

scala> class Student[T](val localId :T){

     |   def getSchoolId(hId :T)= "S-"+hId +"-"+localId 

     | }

defined class Student

 

scala> val tom = new Student[String]("uuuuuu")

tom: Student[String] = Student@7eb200ce

 

scala> tom.getSchoolId("222")

res1: String = S-222-uuuuuu

 

 

 

 

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泛型函数

 

scala> def getMiddle[T](a:Array[T]) = a(a.length / 2)

getMiddle: [T](a: Array[T])T

 

scala> getMiddle(Array("mary","had","a","cat"))

res2: String = a