Scala 中的有界泛型（如 Java 中的）

发布于 2024-12-10 17:32:01 字数 382 浏览 0 评论 0原文

我正在将一个应用程序从 java 迁移到 Scala。在java中我有类似的东西

abstract class CommonObjectInfo{//...}
class ConcreteObject extends CommonObjectInfo{//...}

abstract class AbstractWrapper<E extends CommonObjectInfo>{//...} 
class ConcreteWrapper extends CommonObjectInfo<ConcreteObject>{//...}

How can I Form Iexpress the "wrappers" object in Scala?我

原文

I'm migrating an app from java to Scala.
In java I have somethng like

abstract class CommonObjectInfo{//...}
class ConcreteObject extends CommonObjectInfo{//...}

abstract class AbstractWrapper<E extends CommonObjectInfo>{//...} 
class ConcreteWrapper extends CommonObjectInfo<ConcreteObject>{//...}

How can I express formally the "wrappers" objects in Scala? I

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时光无声 2024-12-17 17:32:01

abstract class CommonObjectInfo
class ConcreteObject extends CommonObjectInfo

abstract class AbstractWrapper[E <: CommonObjectInfo]
class ConcreteWrapper extends AbstractWrapper[ConcreteObject]

abstract class CommonObjectInfo
class ConcreteObject extends CommonObjectInfo

abstract class AbstractWrapper[E <: CommonObjectInfo]
class ConcreteWrapper extends AbstractWrapper[ConcreteObject]

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芸娘子的小脾气 2024-12-17 17:32:01

通常的解决方案是来自agilesteel的解决方案，但有时将类型信息拉入类“内部”很有用（特别是当所讨论的类型被认为是实现细节时）：

abstract class CommonObjectInfo

class ConcreteObject extends CommonObjectInfo

abstract class AbstractWrapper{
 type objectInfo <: CommonObjectInfo
}

class ConcreteWrapper {
  type objectInfo = ConcreteObject 
}

The usual solution is the one from agilesteel, but sometimes it's useful to pull the type information "inside" the class (especially when the type in question is considered to be an implementation detail):

abstract class CommonObjectInfo

class ConcreteObject extends CommonObjectInfo

abstract class AbstractWrapper{
 type objectInfo <: CommonObjectInfo
}

class ConcreteWrapper {
  type objectInfo = ConcreteObject 
}

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