扩展内部接口？ [英] Extending an inner interface?

问题描述

我有一个简单的问题：

为什么Eclipse会对实现这两个接口感到尖叫？

Why does Eclipse scream about implementing these two interfaces?

public abstract class Gateway implements IPlayerity, IItemity {
    public interface IPlayerity { ... }
    public interface IItemity { ... }
    // I...ity
}

我收到此错误消息：

IPlayerity无法解析为类型

IPlayerity cannot be resolved to a type

推荐答案

你有一个循环依赖，无法解决JLS的工作方式（虽然我不确定JLS在哪里记录）。

You have a cyclic dependency that can't be resolved given the way the JLS works (although I'm not sure where in the JLS this is documented).

接口IPlayerity和IItemity对NestedInterfaces类头定义不可见，因为它们位于其中。我可以通过将程序更改为

The interfaces IPlayerity and IItemity are not visible to the NestedInterfaces class header definition, since they are inside it. I can fix this by changing your program to

public class NestedInterfaces implements 
      NestedInterfaces.IPlayerity, NestedInterfaces.IItemity 
{
    public interface IPlayerity {}
    public interface IItemity {}
}

然后Eclipse给了我这个错误，这更加明确：

but then Eclipse gives me this error, which is much more clear:

 Multiple markers at this line
 - Cycle detected: the type NestedInterfaces cannot extend/implement itself or one of its own member types
 - Cycle detected: the type NestedInterfaces cannot extend/implement itself or one of its own member types

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