ch 1 Object-Oriented Programming.ppt

8/17/2019 ch 1 Object-Oriented Programming.ppt

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An Introduction to Programming Using

Object-Oriented

Programming


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Object-Oriented ProgrammingObject-Oriented Programming

An algorithm is a step-by-step process.

A computer program is a step-by-step set of

instructions for a computer.

Every computer program is an algorithm.

Algorithms have a long history in science,

technology, engineering and math.


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Early computers ere

far less comple! than

computers are today.

"heir memories ere

smaller and their programs

ere much simpler.


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"hey usually e!ecuted onlyone program at a time.


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#odern computers are

smaller, but far more

comple! than earlycomputers.

"he can e!ecute many

programs at the same time.


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$omputer scientists have

introduced the notion of

objects and object- oriented programming to

help manage the groing

comple!ity of modern

computers.


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An object is anything that can be represented by

data in a computer%s memory and manipulated by

a computer program.






a computer program.

&umbers






a computer program.

"e!t






a computer program.

Pictures






a computer program.

'ound






a computer program.

(ideo




An object is anything that can be represented by data.




An object can be something

in the physical orld or

even just an abstract idea.

An airplane, for e!ample, is

a physical object that can

be manipulated by a

computer.




An object can be something

in the physical orld or

even just an abstract idea.

A ban) transaction is an

e!ample of an object that

is not physical.




"o a computer, an object is

simply something that can

be represented by data in

the computer%s memory and

manipulated by computer

programs.




"he data that represent the

object are organi*ed into a

set of properties.

"he values stored in an

object%s properties at any

one time form the state of an object.

NameName++ PA /PA /

Owner Owner ++ U' AirlinesU' Airlines

LocationLocation++ 012 345 & 0 62 015 7 012 345 & 0 62 015 7

Heading Heading ++ 161688

Altitude Altitude++ 6 m6 m

AirSpeed AirS peed ++ 33

MakeMake++ 9oeing9oeingModel Model ++

Weight Weight ++ 1,:13 )g1,:13 )g




$omputer programs

implement algorithms that

manipulate the data.

In object-oriented

programming, the programs

that manipulate theproperties of an object are

the object%s methods.




7e can thin) of an object

as a collection of properties

and the methods that are

used to manipulate those

properties.

Properties

#ethods




A class is a group of

objects ith the same

properties and the same

methods.




Each copy of an object

from a particular class iscalled an instance of

the object.




"he act of creating a

ne instance of anobject is called

instantiation.




A class can be thought

of as a blueprint forinstances of an object.




"o different instances of

the same class ill havethe same properties, but

different values stored in

those properties.


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"he same terminology

is used in most object-

oriented programming

languages.

Object

Instance

Property

MethodInstantiation

Class

State

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ch 1 Object-Oriented Programming.ppt

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