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an interview question

Raja seemakurthi
Greenhorn

Joined: Jun 28, 2007
Posts: 17
is it possible to return an interface reference type by a any java method?


Thanks,
Raja
Henry Wong
author
Sheriff

Joined: Sep 28, 2004
Posts: 19072
    
  40

Originally posted by Raja seemakurthi:
is it possible to return an interface reference type by a any java method?


Do you mean something like this?



Henry


Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)
Raja seemakurthi
Greenhorn

Joined: Jun 28, 2007
Posts: 17
yes, exactly i want that only.

he asked me whether we can return a List type from a method.
later he asked me other quesstion, ie.... if a method can return an interface type then , is it feature of OOPS ar Java?


i said this is OOPs feature only.
Stan James
(instanceof Sidekick)
Ranch Hand

Joined: Jan 29, 2003
Posts: 8791
See if you can do a quick survey and tell how many languages have something comparable to Java's interface. The concept of a pure abstract type like that has been around, but Kent Beck's Implementation Patterns says something like Java is one of the first "mainstream, commercially successful" languages to have "interface" in the language.

I just had to look back at a Turbo Pascal program ... it had "Interface" and "Implementation" keywords to mark off blocks of code even before OO, but I don't recall them being polymorphic.


A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi
 
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subject: an interview question