- abstract class:
A class that cannot be directly instantiated (Booch et al. 2005). Compare concrete class.
- abstract data type:
A data type that is defined by the operations that manipulate it and thus has its representation details hidden.
- abstract interface specification:
A specification that defines the external view of the information hiding class—that is, all the information required by the user of the class.
- abstract operation:
An operation that is declared in an abstract class but not implemented.
A computation that executes as a result of a state transition.
- active object:
See concurrent object:.
A computation that executes for the duration of a state.
An outside user or related set of users who interact with the system ...
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