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annotations and marker interfaces

Posted on 2014-03-25
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You cannot force your subclasses to unimplement an interface. Annotations can have parameters of various kinds, and they are much more flexible than the marker interfaces.

I am reading as above. I have not understood clearly .

Are marker interfaces not  needed if annotations there. ?
please advise
Any links resources ideas highly appreciated. Thanks in advance
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Question by:gudii9
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mccarl earned 2000 total points
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Basically, yes, marker interfaces are the old way of identifying a class with some extra metadata, eg. the Serializable interface is just a marker interface that, when a class "implements" that interface, marks that class as able to be serialized.

Annotations are the new way of providing this metadata. If Java was totally redesigned removing all the backwards compataible stuff, then Serializable would be an annotation that you could annotate your class with. It also states that annotations are more flexible, because in addition to just marking a class with just one piece of metadata, with annotations you are able to provide all sorts of metadata with the annotation. As just one made up example, if Serializable was done as an annotation, you could also include in the annotation the name of another class that should be used to actually perform the serialization. Also, annotations are more flexible because they can be applied to more than just classes; you can annotate methods,fields,variables,parameters,packages,etc
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by:gudii9
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If Java was totally redesigned removing all the backwards compataible stuff, then Serializable would be an annotation that you could annotate your class with.

Is this could be future enhancement in java which is is not existing now(make Serializeble as annotation)

please advise
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by:gudii9
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please advise
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