王家林亲授《DT大数据梦工厂》大数据实战视频 Scala 深入浅出实战经典(1-64讲)完整视频、PPT、代码下载:
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package com.parllay.scala.type_parameterizitor /** * Created by richard on 15-8-9. * 第54讲:Scala中复合类型实战详解 */ trait Compound_Type1; trait Compound_Type2; class Compound_Type extends Compound_Type1 with Compound_Type2 object Compound_Type { def compound_Type(x: Compound_Type1 with Compound_Type2) = {println("Compound Type in global method")} def main(args: Array[String]) { /** * new 一个复合类型 */ compound_Type(new Compound_Type with Compound_Type1 with Compound_Type2) /** * 创建一个object */ object Compound_Type_Object extends Compound_Type1 with Compound_Type2 compound_Type(Compound_Type_Object) /** * 利用type申明别名 */ type compound_Type_Alias = Compound_Type1 with Compound_Type2 def compound_Type_Local(x: compound_Type_Alias) = println("Compound Type in local method") /** * */ val compound_Type_Class = new Compound_Type compound_Type_Local(compound_Type_Class) /** * 复合类型中也可以包含结构类型 */ type Scala = Compound_Type1 with Compound_Type2 {def init(): Unit} } } /** * class A extends B with C with D with E 应做类似如下形式解读: class A extends (B with C with D with E) T1 with T2 with T3 … 这种形式的类型称为复合类型(compound type)或者也叫交集类型(intersection type)。 跟结构类型类似,可以在一个方法里声明类型参数时使用复合类型: scala> trait X1; trait X2; scala> def test(x: X1 with X2) = {println("ok")} test: (x: X1 with X2)Unit scala> test(new X1 with X2) ok scala> object A extends X1 with X2 scala> test(A) ok 也可以通过 type 声明: scala> type X = X1 with X2 defined type alias X scala> def test(x:X) = println("OK") test: (x: X)Unit scala> class A extends X1 with X2 scala> val a = new A scala> test(a) OK 在上一篇介绍结构类型时也提到过复合类型中也可包含结构类型: scala> type X = X1 with X2 { def close():Unit } defined type alias X */
时间: 2024-10-25 00:30:12