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Chaper-2 self test doubt

 
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In this example why do you need no-arg superclass constructor?

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I am not getting example 5. It says E & F are correct but I think A is also correct. Because if you want low coupling you need to make attributes of the class are all private. Please correct me if I am wrong.
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Can anyone explain me?
I would appreciate your help.
 
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Originally posted by dolly shah:
... In this example why do you need no-arg superclass constructor? ...


Unless there is an explicit call to this or super, the first line in a constructor is an implicit call to super with no arguments.

The constructor for the subclass Bottom2 has no explicit calls to this or super, so it has has an implicit call to super with no arguments. No such constructor exists in Top.
 
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Thanks Marc. I got it.
 
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Originally posted by dolly shah:
I am not getting example 5. It says E & F are correct but I think A is also correct. Because if you want low coupling you need to make attributes of the class are all private.

Private variables alone aren't a sufficient indication for low coupling. It's easy to combine private variables with high coupling.
 
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