使用接受Kotlin中受保护类的公共方法从Java类继承 [英] Inheritance from Java class with a public method accepting a protected class in Kotlin

问题描述

我有这种情况:有一个Java类

I have this situation: There are a Java class

public class A {

    public void overrideMe(B param){
        //TODO: override me in Kotlin!
    }

    protected static class B {

    }
}

和一个继承自它的Kotlin类，并且必须重写方法"overrideMe"

and a Kotlin class, which inherits from it and has to override method "overrideMe"

class K: A() {
    override fun overrideMe(param: B) {
        println("Wow!")
    }
}

但是Kotlin不允许这种行为.

But Kotlin doesn't allow this behaviour.

"public"函数公开其受保护的(在A中)"参数类型B

'public' function exposes its 'protected (in A)' parameter type B

有什么办法解决这个问题吗?

Is there any way how to resolve this one?

P.S.这不仅仅是一个综合案例-当我尝试实现自定义

P.S. It's not just a synthetic case - I faced this problem when I tried to implement custom Spring AmqpAppender and to override it's postProcessMessageBeforeSend method.

推荐答案

毕竟，结论是:纯Kotlin无法解决这种情况.

Well, after all, the conclusion is: there is no way to solve this situation in pure Kotlin.

我希望AmqpAppender.Event在不久的将来公开.

I hope that AmqpAppender.Event will become public in the nearest future.

即使Java允许这种行为，对我(对于Kotlin的开发人员)来说，在公共方法中包含不公开的参数似乎也是一个糟糕的设计.

Even if Java allows that behaviour, having no-public arguments in public methods seems like a bad design for me (also for the developers of Kotlin).

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