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Interface Query
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Ankur Mahajan
Greenhorn
Joined: Feb 03, 2008
Posts: 8
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Is it possible to declare one interface within another?
If yes then why and if no then why not.
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fred rosenberger
lowercase baba
Bartender
Joined: Oct 02, 2003
Posts: 9950
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have you tried it? What happened?
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Never ascribe to malice that which can be adequately explained by stupidity.
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Campbell Ritchie
Sheriff
Joined: Oct 13, 2005
Posts: 32689
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Welcome to the Ranch.
Look in the Java Language Specification. Look at first at Section 6.4.4
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Ankur Mahajan
Greenhorn
Joined: Feb 03, 2008
Posts: 8
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Yes I have tried it and it is allowing to declare one interface within another but when I implement that interface in a class, it does not give error for "unimplemented methods" of inner interface.
but at first place why it is allowing to declare an interface inside another.
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Ankur Mahajan
Greenhorn
Joined: Feb 03, 2008
Posts: 8
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hey Campbell
According to specifications it can be done.
But can you tell,where it can be useful or when such declaration is needed.
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Rob Spoor
Sheriff
Joined: Oct 27, 2005
Posts: 19216
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Check out java.util.Map and java.util.Map.Entry.
Map.Entry is an interface that only makes sense in the context of a Map. Declaring it as an inner interface creates a form of coupling between the two interfaces.
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SCJP 1.4 - SCJP 6 - SCWCD 5
How To Ask Questions How To Answer Questions
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subject: Interface Query
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