No interface when the constructor mandatorily requires arguments??

[qazmlp1209]

Requirement:
- A class has 4 members. 2 of these members are must to constitute the
concrete object.
The other 2 are optional.

What I thought of for defining interfaces to the users are:
- Provide only one version of constructor taking the 2 mandatory
members as arguments.
- Provide setters for the other 2 members.
- Provide getters for all the 4 members.

In general, it is a good style to introduce an 'interface' with all the
methods that the users require for. But unfortunately, this does not
seem to work for my above-mentioned requirements. This is due to the
reason that the class implementing the interface should provide a
constructor with empty arguments.

Can anybody suggest the best approach for such cases?

 

[René Beltman]

Write an abstract class. In this class you can set the constructor sorts.

Greetings,

René

 

[Hendrik Maryns]

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(e-mail address removed) schreef:

Requirement:
- A class has 4 members. 2 of these members are must to constitute the
concrete object.
The other 2 are optional.

What I thought of for defining interfaces to the users are:
- Provide only one version of constructor taking the 2 mandatory
members as arguments.
- Provide setters for the other 2 members.
- Provide getters for all the 4 members.

In general, it is a good style to introduce an 'interface' with all the
methods that the users require for. But unfortunately, this does not
seem to work for my above-mentioned requirements. This is due to the
reason that the class implementing the interface should provide a
constructor with empty arguments.

Why? Is this some restriction you impose on yourself? Anyway, you
cannot write an interface for constructors, so this won?t work anyway.

H.

--
Hendrik Maryns

==================
www.lieverleven.be
http://aouw.org
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