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1-requirments analysis activites
identify attr+operations without parameters/types
2-object design activites
Add(visibility info , signature type , contracts)
*in obj-design developer can be:
+ Class user (call the class)=>public=> League championship
- Class implementor(implemet the class-realize it)=>private=>The championship game
# Class extender (implement the sub class-refine it)=>protected=>chess
Info. Hiding >> Apply the "need to know" principle
>> Not major issue during (ANALYSIS) , a problem during (DESIGN)
>> Limits the effect of changes
(changes can be understood clearly+do not cause major recompilation of the system)
Info. Hiding VS efficiency
The class user has to know the fewer details , this also make changes in
class implementation easier and the less likely will be affected
**BUT**
To access a private attribute might be too slow! (real-time systems , Games)
note:Attributes can be accessed only via operations (operations of the class can manipulate its attributes)
note:constrains are nonfunctional req , example:
1-limited development resourses.
2-desecions by senior managment that restrict the development way.
CONSTRAINTS can be modeled by CONTRACTS that's written in OCL .
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