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having protected variables in interfaces?

Justin Fox
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Joined: Jan 24, 2006
Posts: 802
ok, i was wondering can you have protected variables that you

can modify in your classes?

umm, somethin like



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Alana Sparx
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Joined: Feb 14, 2006
Posts: 121
I'm fairly sure interfaces only allow you to have public, static and/or final modifiers for methods and primitives.

The compiler should tell you though.....
Peter Chase
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Joined: Oct 30, 2001
Posts: 1970
You can't have any fields/variables in an interface, except constants (public static final). You can't have any access modifiers, except public.

Generally, you should not bother writing the "public" in interfaces, as everything is public anyway. Well, perhaps this is a matter of style, but I think so.


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Vinayak patil
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Joined: Aug 30, 2005
Posts: 67
I have a question related to variables in interfaces:

Why do we have to initialize the variables when we declare them in an interface? And why are they treated as final variables?

Thanks in advance,
Vinayak


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Ernest Friedman-Hill
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Joined: Jul 08, 2003
Posts: 24183
    
  34

Because they are not "variables" -- that's the whole point. They're constants. Interfaces can't include any per-instance data.


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