Friday, February 1, 2008

most common types of OO classes

There are many types of classes you encounter as an OO designer, such as when you study design patterns. Here are some common types of classes -- we are not saying "objects".

* domain objects -- classes representing real-world entities specific to your business domain, including abstract things like a reimbursement, enrollment. FTTP projects is typical. "data-model-object" is the term used in [[ hardcore java ]]

* data objects -- typically one class for one db table, one object for one row.

* state+operation object (s+o objects) -- a class primarily made up of state variables, with operations defined /based-on/ the object state.

* Software-engineering objects -- No better name. These classes have no real-world counterparts. These classes were written purely for software engineering. Eg: wrapper, adapter, connection, message-receiver, controller, DAO ...

Some less common types of classes:
* process-objects -- modeling a real process, in workflow applications ...

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