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variavle declaration in interface

 
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Is it mandatory to intialize a variable declared in an interface?
 
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Yes! I think they are.

Try comiling a interface with a variable that is not instanciated and you will get a compile error

= expected

 
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You can't declare variables in interfaces. You can only have public static final fields - i.e. constants. These must be given a value within the interface.
 
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And you shouldn't do that... Effective Java, topic 17.
 
Don't get me started about those stupid light bulbs.
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