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Click on the navigation bars on the left for a variety of helpful
information on object oriented programming.
Important things to remember:
- Good programs are
- Flexible
- Robust
- Extensible
- Easy to understand
- Easy to maintain
- An object oriented program is a collection of interacting
objects.
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Good OO programs are characterized by
- Encapsulation
- information hiding
- modular design
- Reliance on public method contracts not internal
implementation
- Loose coupling between objects.
- High levels of abstraction -- polymorphic behavior
- A program starts by creating one object whose job it is to create
all objects that are initially needed.
- Objects can create other objects.
- Objects can be disposed and cease to exist.
- Objects do not need names to function.
- Objects should only know the minimum of what
they need to know and should do only the minimum of what they need to
do. This is called "loose coupling". Don't make "god
objects".
- Objects should expose the minimum information
and methods needed by the rest of the program. This is
another aspect of loose coupling.
- When using an object, do not concern yourself with how its methods
are implemented, only on what that class defines as the function of that
method. Thus a method involves more than just code, but
also a "contract" with the rest of the program.
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