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Possible Duplicate:
What's the best way to refactor a method that has too many (6+) parameters?
If a constructor has a long parameter list, should we consider it bad style and refactor it? If yes, how?
It may be an appropriate set of parameters, but a lot of the time my answer would be yes. Break the parameters into a logical subgroupings if they exist i.e. rather than creating a Car from many different parts, group some parts into an Engine object, some into a Chasis etc.
Alternatively, if some of those parameters are optional, make use of the builder pattern so that you only include them when necessary.
Ultimately, though, do whatever makes most sense for you and your domain.