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Empty abstract classs vs Empty interface
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A Kumar
Ranch Hand
Joined: Jul 04, 2004
Posts: 973
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whats a difference between an empty abstract classs and an empty interface?
Regards
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fred rosenberger
lowercase baba
Bartender
Joined: Oct 02, 2003
Posts: 9948
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In a single class, you can implement as many interfaces as you want, but you can only inherit from one abstract class.
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Never ascribe to malice that which can be adequately explained by stupidity.
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A Kumar
Ranch Hand
Joined: Jul 04, 2004
Posts: 973
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A friend of mine was asked this question and she replied the same as you mentioned. But he wasnt satisfied. So is there more to it than just one explanation.
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Paul Clapham
Bartender
Joined: Oct 14, 2005
Posts: 16483
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Who wasn't satisfied? Your friend is "she" so this "he" is a third person. Seems to me that's the person you should be asking.
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Ernest Friedman-Hill
author and iconoclast
Marshal
Joined: Jul 08, 2003
Posts: 24057
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Well, an empty interface has a special name (a "marker interface"), and the JDK contains a number of examples of how they used to be used, back before annotations were introduced in Java5. An empty abstract class -- well, that's just dumb 
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[Jess in Action][AskingGoodQuestions]
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subject: Empty abstract classs vs Empty interface
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