covariant

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What is the proper OO way to convert an object to one of its subclasses (covariant return type)?

I have a subclass that needs to return a subclass of the return type of its parent class.I believe this is called a covariant return type.I am wondering the simplest way to convert from the parent to[详细]

2023-03-29 02:11 分类：问答
Covariant Return Type in Interface not compiling via Javac

I have the following structure: public interface BarReturn {} public interface FooReturn {} public interface FooBarReturn extends FooReturn, BarReturn {}[详细]

2023-03-28 13:21 分类：问答
Covariant generic parameter

I\'m trying to understand this but I didn\'t get any appropriate results from searching. In C# 4, I can do[详细]

2023-03-15 19:03 分类：问答
Scala - root of covariant type hierarchy

The following Scala class: class Foo[+T <: Bar] extends FooBase ... effectively defines a type hierarchy which has Foo[Bar] as its root - i.e. any valid Foo[X] will be assignable to a Foo[Bar] v[详细]

2023-03-13 19:26 分类：问答
java covariant return type

Why does below code prints \"1\" ? class A { int x = 1; } class B extends A { int x = 2; } class Base { A getObject() {[详细]

2023-03-08 17:39 分类：问答
Is there any better solution for abstract class A<T extends A>?

I want to override a method and replace a parameter it takes with a subclass of that parameter. For return type there is no problem, because they are not a part of method signature and can be replace[详细]

2023-02-23 00:03 分类：问答
Java covariant return types not working for overriding methods of an enum instance?

I spent quite a while with Google to find some information on this topic, but results relating to both Java enums and covariant return types were pretty much non-existent.[详细]

2023-02-03 14:16 分类：问答
有支原体感染可以做试管婴儿吗？

猫王ot1 2022-04-16 07:46 当有支原体细菌感染时，应该医治好以后再怀孕。支原体细菌感染时，简单产开发者_JAVA技巧生怀孕流产的病症，还大概会对胚胎发育有作用，能够用阿奇霉素、强力霉素等药品选择医治，治疗[详细]

2022-12-25 14:50 分类：问答