今天学习了scala的复合类型的内容,让我们通过实战来看看代码:

trait Compound_Type1
trait Compound_Type2
class Compound_Type extends Compound_Type1 with Compound_Type2

object test54 {
  def compound_Type(x:Compound_Type1 with Compound_Type2) = {println ("Compound_Type test")}
  def main(args:Array[String]){
   
    compound_Type(new Compound_Type1 with Compound_Type2)
    object compound_Type_oject extends Compound_Type1 with Compound_Type2
    compound_Type(compound_Type_oject)
   
    type compound_Type_Alias = Compound_Type1 with Compound_Type2
    def compound_Type_Local(x:compound_Type_Alias)=println("Compound_Type test2")
    val compound_Type_Class = new Compound_Type
    compound_Type_Local(compound_Type_Class)
   
    type Scala = Compound_Type1 with Compound_Type2 {def init():Unit}
   
   
   
   
  }
}

首先,定义了两个特质Compound_Type1和Compound_Type2,然后定义了类Compound_Type继承自它们。

然后我们定义一个compound_Type方法,它只允许传入Compound_Type1 with Compound_Type2类型的对像,这种类型,就叫做复合类型。

当我们新定义一个对像时并调用该方法时,便会打印Compound_Type test

当然,我们也可以使用type方法来给复合类型定义一个别名,如:

type compound_Type_Alias = Compound_Type1 with Compound_Type2
 def compound_Type_Local(x:compound_Type_Alias)=println("Compound_Type test2")

 

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