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interface

 
Aru
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Hi all,
This question is from a Mock Test.
Which of the following is true ?
a. Subclasses must define all the methods that the superclass defines.
b. A class must define all the methods in the interface that it says it implements.
c. A class can't override the super class's constructor.
d. It is possible for 2 classes to be superclass of each other.
e. An interface can implement multiple interfaces.
My answers were ....
a. False.
b. True // Note
c. True
d. False never. ClassCircularityError occurs
e. False it can only extend multiple interface

But the test says the right answer is only c.
I think this is true
b. A class must define all the methods in the interface that it says it implements.

Aruna.
[This message has been edited by Aru (edited August 31, 2000).]
 
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Sheriff
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unless it is declared as abstract...
 
Frank Wang
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Hi, Aruna, no, the only answer is C.
Answer b(A class must define all the methods in the interface that it says it implements) is wrong because a class does not implement all the methods in an interface. In this case this class is an abstract class, must be declared as abastract.
With regards!
Frank
 
Aru
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Thx , Yes..unless it is abstract.
Aruna
 
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