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coupling problem  RSS feed

 
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sun preevaluation test




Which is true?
a. These classes are NOT coupled.
b. These classes are loosely coupled.
c. These classes are tightly coupled.
d. These classes are abstractly coupled.

my answer is c;is it correct
 
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yeah..c is the right answer
 
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but Class Two accesses field of One through accessor method. Is it because the method getX is package visible....
 
Greenhorn
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Can you please explain why it is tightly coupled and not loosely coupled? I'm not sure in questions about coupling and cohesion. I think loose coupling means that class Two doesn't know the implementation details about class One and uses it's API(interface), so I would say that b is correct - where am I wrong?

Thanks for answering
[ August 29, 2008: Message edited by: Rasto Slivensky ]
 
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I think, these classes are loosely coupled, because class Two is accessing the variable x using accessor method. and in both classes instance variables are private.

so option 'b' is true.

Can anyone tell what is this "abstractly coupled" and in which case two classes are NOT coupled
 
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I think these classes are loosely coupled which use methods to acces variable
[ August 30, 2008: Message edited by: Ninad Kulkarni ]
 
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If these two classes belongs to the same pprograme than it is loose coupling if difffrent than Class two can't see the implementation of Class one. so it is tight coupling.

note:
----------------------------------------------
please let me know whether am I right or not ?
----------------------------------------------
 
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I think the two classes are tightly coupled,Because class Two's y depends on the implementation of getX() of class One.
 
Ankit Garg
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Classes are tightly coupled if they depend on the internal implementation of each other. But I don't think that acessor and mutator methods are considered internal implementations. My only concern is still that getX is not public....
 
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These two classes are loosly coupled and not tightly. So option B is correct. In tightly coupled methods if change code in class A then it do not affect class B so they not tighly coupled. Both implementation do not affect each other. and class B is using class A so there is loose coupling. I hope this thread is now clear.
 
Vijitha Kumara
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You are right Narendra,I got it wrong first place. More explanation on this at sun
 
It is sorta covered in the JavaRanch Style Guide.
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