Solved

annotations and marker interfaces

Posted on 2014-03-25
3
241 Views
Last Modified: 2014-04-29
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
0
Comment
Question by:gudii9
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 36

Accepted Solution

by:
mccarl earned 500 total points
ID: 39954846
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
0
 
LVL 7

Author Comment

by:gudii9
ID: 40007009
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
0
 
LVL 7

Author Comment

by:gudii9
ID: 40020411
please advise
0

Featured Post

Optimize your web performance

What's in the eBook?
- Full list of reasons for poor performance
- Ultimate measures to speed things up
- Primary web monitoring types
- KPIs you should be monitoring in order to increase your ROI

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
This was posted to the Netbeans forum a Feb, 2010 and I also sent it to Verisign. Who didn't help much in my struggles to get my application signed. ------------------------- Start The idea here is to target your cell phones with the correct…
Video by: Michael
Viewers learn about how to reduce the potential repetitiveness of coding in main by developing methods to perform specific tasks for their program. Additionally, objects are introduced for the purpose of learning how to call methods in Java. Define …
Viewers will learn about if statements in Java and their use The if statement: The condition required to create an if statement: Variations of if statements: An example using if statements:
Suggested Courses

628 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question