Re: Forcing sub-classes to implement Constructor

No.

Constructors are more like static methods than 
regular methods: they can't be declared abstract 
and thus force subclasses to have them. You can 
add tools to your build to recognize certain 
annotations that trigger verifier rules. For 
example, you could define an annotation such as:

@SubclassConstructorRequiredPattern(presense=REQUIRED, 
constructor=PUBLIC_DEFAULT)

which would be applied to the base class. Some 
part of your build then would scan code either 
jsut before or just after compilation to see if 
it breaks all the rules defined by such annotations.

Sounds like an awful lot of work, though. What's 
your use-case? Why do you ned subclasses to 
supply a public default constructor?

Brian Maso

At 07:13 AM 8/9/2007, you wrote:
>Is there a way to force subclasses of a class to implement a certain (read
>empty) constructor.
>
>mvh roger j
>
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