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interface!

 
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Q.19 Select all correct answers about what is the definition of an interface?(java-caps mock exam2)
A) It is a blue print
B) A new data type
C) Nothing but a class definition
D) To provide multiple inheritance
Answer:A,B,D.
hi! i didn't get the second option(B), what does it mean here?
thanks.

ashok.
 
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A new data type, like Comparable.
 
Don't get me started about those stupid light bulbs.
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