object in computer science

Object in
Computer science
Computer Science
Project
College pilote Mégrine
2019 -2020
Realised by :
Mayssa Koubâa
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1
PLAN
What is an object ?
How do objects collaborate ?
What criteria allow as to classify
something as an object?
1
2
3
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What is an object ?
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“Something you can do things to” (G. Booch)
variable
variable
variable
An object = an entity that has its state and behavior
- The object maintains its state in one or more variables
●Variable = a data named by an identifier
- The object implements its behavior by the methods
●Method = a function associated with an object
State (variables)
●An object is an IT entity that includes variables and methods
Behavior (methods)
The variables form a core of the object and the methods form an envelope that surrounds the
kernel and hides it to other objects in the program 3

What is an object ?
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Dog modeled as computer object
- Dog with the state defined by its
name, color, race, position, ...
and behavior as: sitting, couch,
brings, barks ...
- Bike with the state defined by its number
of speeds, current speed, color, ...
and behavior as: accelerates, changes the
speed ...
slows
accelerate
Nb speeds
current speed
color
Change
speed
Sits
name
color
Position
Lies brings
Examples of real world objects
Bike modeled as computer object
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1
PLAN
What is an object ?
How do objects collaborate ?
1
2
3What criteria allow as to classify
something as an object?
5