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Interface or abstract ?

 
Greenhorn
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I was reading about interface and abstract and they are behaving like same. Interface gives the benefits of an abstract as well interface. So, which one I should use always?
Someone please explain.
Thanks in advance.
 
Ranch Hand
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well what i think of is ,one advantage of using abstract over interface is that you can declare non-abstract methods as well.
asheet
 
Ranch Hand
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Abstract vs. Interface selection should be used ruled by use.
For instance: Interfaces can be used to multiple inheritance while Abstract can contain (as mentioned in another reply to this topic) non-abstract features as well.
------------------
Antti Barck
It Solutions Consultant -- NSD Oy
(SCJP pending)
 
Bob Vel
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Which one is the most preferable to use?
 
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Joshua Bloch, author of "Effective Java" advises that you should prefer interfaces. Do a search in the Java in General (Intermediate) forum for some discussions on this.
 
Consider Paul's rocket mass heater.
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