PACKAGES AND INTERFACE ONE LINER PART 03
1) How many concrete classes can you have inside an interface?
Ans.: None
2) Can you extend an interface?
Ans.: Yes
3) Is it necessary to implement all the methods of an interface while implementing the interface?
Ans.: No
4) If you do not implement all the methods of an interface while implementing , what specifier should you use for the class ?
Ans.: abstract
5) How do you achieve multiple inheritance in Java?
Ans: Using interfaces.
6) How to declare an interface example?
Ans : access class classname implements interface.
7) Can you achieve multiple interface through interface?
a)True
b) false
Ans : a.
8) Can variables be declared in an interface ? If so, what are the modifiers?
Ans : Yes. final and static are the modifiers can be declared in an interface.
9) What are the possible access modifiers when implementing interface methods?
Ans : public.
10) Can anonymous classes be implemented an interface?
Ans : Yes.
11) Interfaces can’t be extended.
a)True
b)False
Ans : b.
2) Name interfaces without a method?
Ans : Serializable, Cloneble & Remote.
13) Is it possible to use few methods of an interface in a class ? If so, how?
Ans : Yes. Declare the class as abstract.
Ans.: None
2) Can you extend an interface?
Ans.: Yes
3) Is it necessary to implement all the methods of an interface while implementing the interface?
Ans.: No
4) If you do not implement all the methods of an interface while implementing , what specifier should you use for the class ?
Ans.: abstract
5) How do you achieve multiple inheritance in Java?
Ans: Using interfaces.
6) How to declare an interface example?
Ans : access class classname implements interface.
7) Can you achieve multiple interface through interface?
a)True
b) false
Ans : a.
8) Can variables be declared in an interface ? If so, what are the modifiers?
Ans : Yes. final and static are the modifiers can be declared in an interface.
9) What are the possible access modifiers when implementing interface methods?
Ans : public.
10) Can anonymous classes be implemented an interface?
Ans : Yes.
11) Interfaces can’t be extended.
a)True
b)False
Ans : b.
2) Name interfaces without a method?
Ans : Serializable, Cloneble & Remote.
13) Is it possible to use few methods of an interface in a class ? If so, how?
Ans : Yes. Declare the class as abstract.
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