Through the object concept, a child comes to realize that objects have a permanence and
identity apart from any operations on them.
what is an Object?
an object represents an individual, identifiable item, unit, or entity, either real or
abstract, with a well-defined role in the problem domain.
control objects
--the ones that unite courses of events and thus will carry on communication with other
objects.
Some objects may have crisp conceptual boundaries yet represent intangible events or
processes.
An object has state, exhibits some well-defined behavior, and has a unique identity.
Some objects may be tangible yet have fuzzy physical boundaries.
attributes such as beauty or color are not objects, nor are emotions such as love and
anger. On the other hand, these things are... (查看原文)
The part of software development that will go away is the crafting of conceptual
structures; the part that can go away is the labor of expressing them.
The UML has numerous types of diagrams, each providing a certain view of your system.
Across all diagrams, all entities with the same name are considered to be references to
the same modeal item.
UML can be classified into two groups:
structure diagrams and behavior diagrams.
Behavior Diagrams
-User Case Diagram
-Activity Diagram
-State Machine Diagram
-Interaction Diagrams
.. Sequence Diagram
.. Communication Diagram
.. Interaction Overview Diagram
.. Timing Diagram
forward-engineering
reverse-engineering
The Conceptual model
captures the system in terms of the domain entities that exist(or will exist) and their
association wi... (查看原文)
