可串行标记接口是否包含默认方法？ [英] can marker interface like serializable contain default methods?

问题描述

我认为它不能，因为标记接口原则是没有任何方法，但由于默认方法不是 abstract 我不确定。

I think it can't, because marker interface principle is to not have any methods, but since default methods are not abstract I am not sure.

推荐答案

就Java而言，Marker接口只是一个常规接口。因此，它可以像任何（Java-8）接口一样使用默认方法。

A "Marker" interface is just a regular interface as far as Java is concerned. Thus, it can have default methods just as any (Java-8) interface can.

现在，这是否违反了原则一个Marker界面，我不得不说是的。 Marker接口应该作为各种标志，仅识别一个类符合某些外部标准。现在，它可以是标记界面和具有抽象/默认方法，但它将不再纯粹符合定义。

Now, as to whether this violates the principle of a Marker interface, I would have to say yes. A Marker interface should act as a flag of sorts, only identifying that a class meets some external criteria. Now, it can be a Marker interface and have abstract/default methods, but it will no longer purely meet the definition.

来自 Effective Java（第二版）：

标记接口是一个包含no的接口方法声明，但仅指定（或标记）实现接口具有某些属性的类。

A marker interface is an interface that contains no method declarations, but merely designates (or "marks") a class that implements the interface as having some property.

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