OBJECT-ORIENTEDNESS

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OBJECT-ORIENTEDNESS
KCDCC
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WHAT IS OBJECT-ORIENTEDNESS?
KCDCC
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OBJECTS
KCDCC
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There are many THINGS in the World
From Sigfried S (1996). Understanding
Object-Oriented Software Engineering
5
The World
Our Model
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From Sigfried S (1996). Understanding
Object-Oriented Software Engineering
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OBJECTS (cont..)
KCDCC
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OBJECT PROPERTIES
KCDCC
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OBJECT PROPERTIES (cont.)
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CLASSES AND INSTANCES
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Similar THINGS can be GROUPED
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From Sigfried S (1996). Understanding
Object-Oriented Software Engineering
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From Rumbaugh et al. (1991). Object-Oriented
Modeling and Design
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From Rumbaugh et al. (1991). Object-Oriented
Modeling and Design
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CLASS RELATIONSHIPS
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CLASSIFICATION
depends on purpose
KCDCC
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CLASSIFICATION (cont.)
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KCDCC
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INHERITANCE
KCDCC
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From Rumbaugh et al. (1991). Object-Oriented
Modeling and Design
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MULTIPLE INHERITANCE
ato
ato
land vehicle
water vehicle
ato
ato
ato
ato
amphibious vehicle
car
boat
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GENERALIZATION / SPECIALIZATION
KCDCC
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AGGREGATION / DECOMPOSITION
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AGGREGATION / DECOMPOSITION addition of components
lamp
aco
ato
base
cover
switch
aco
aco
socket
ballast
starter
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AGGREGATION / DECOMPOSITION addition of
components (cont.)
lamp
aco
ato
base
cover
switch
isa
fluorescent lamp
isa
aco
L1
ballast
starter
isa
isa
aco
isa
isa
base1
cover1
switch1
ballast1
starter1
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O-O CONCEPTS
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O-O LANGUAGES
Smalltalk first popular OOL
C strongly typed - lots of
housekeeping Eiffel strongly typed -
garbage collection CLOS (Common Lisp
Object System) O-O extension of COMMON LISP
encapsulation not enforced Objective
C Java cleaned-up version of C - no
pointers distributed
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O-O DATABASES
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IMPACT OF 0-0 SYSTEMS ON MODELLING
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