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Fujitsu Computer Systems

OO Programming

Fujitsu Software Corporation

Customer Training Series

Presented by:

Tim OBrienSenior Systems EngineerFujitsu Software Corporation

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PAGE 2 Fujitsu Computer Systems

Intro to Object Oriented COBOL

Discussion of OO ConceptsObjectsMethodsEncapsulationInheritance

olymorphismroperties

!ttributes Classes

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PAGE 3 Fujitsu Computer Systems

Intro to Object Oriented COBOL (Cont)

Create a simple "ello #orld CO$O% Class

Discussion of OO CO$O% Synta&

Create a multi'class OO CO$O% !pplication

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PAGE 4 Fujitsu Computer Systems

OO Concepts C!asses

Classes are collections of Objects that ha(e commonattributes and beha(iors

!bstract Classes are Classes that do not necessarilycorrespond to specific real world objects) They are more

li*e templates

Objects are instantiated from Classes

! Class can typically be thought of as a factory thatproduces Objects at +untime

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PAGE " Fujitsu Computer Systems

OO Concepts # Objects

!n object is a software component , an instanceof a program

!n object typically has data and methods

!n object may ha(e properties and-or attributes

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OO Concepts &et'ods

Methods are li*e functions or subroutines , li*emini programs within a program

Methods may accept and-or return parameters.data/

Methods are In(o*ed .called/ using messages

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8/19PAGE Fujitsu Computer Systems

OO Concepts &et'ods (Cont)

Method rototypes are used to define interfacesinto other Objects and-or to aid the compiler andruntime system to perform conformancechec*ing

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OO Concepts Properties

! roperty is a fi&ed data item with a welldefined format which can only be retrie(edand-or set

In OO CO$O%0 roperties are both internallyand e&ternally a(ailable . ublic/ by default

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OO Concepts Attrib,tes

!n !ttribute is a declarati(e that may bespecified or 1ueried at runtime

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OO Concepts An Object andEncaps,!ation -iagram

D!T!

Method !

M e t h o

d $

M e t h o

d C

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OO Concepts In'eritance

Inheritance allows programmers to reuse codeand may dramatically decrease the time re1uiredto create new applications

Inheritance is supported in Object CO$O%) Thismeans a child class may inherit from a parentclass0 thus combining functionality

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-isc,ssion o. OO Concepts In'eritance -iagram

D!T!

Method !

M e t h o d

$ M e t h

o d C D!T!

Method !

M e t h o d $ M

e t h o

d C

Method D

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OO Concepts Po!/morp'ism

olymorphism allows programmers to inheritfrom classes0 but to alter .customi2e/ inheritedclasses for specific usage needs

3sing olymorphism0 the same method namemay perform slightly different operations ondifferent objects in different circumstances

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OO Concepts Po!/morp'ism -iagram

D!T!

Method !

M e t h o d

$ M e t h

o d C D!T!

Method !

& e t ' o d

B 0

M e t h o

d C

Method D

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PAGE *$ Fujitsu Computer Systems

1 e!!o or!d COBOL C!ass

Create a new CO$O% roject in 4isualStudio )5ET

!dd a new class

Code the class to display 6"ello #orld7$uild and debug the application

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PAGE *% Fujitsu Computer Systems

OO COBOL 5/nta6

Creating CO$O% Classes

Creating roperties

Creating Methods

3sing e&isting CO$O% synta&In(o*ing CO$O% Classes

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PAGE * Fujitsu Computer Systems

7,estions