Sp00 Final Exam Review: Design an Alarm System

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Sp00 Final Exam Review: Design an Alarm System

See Final Exam Review - Sp2000

do we need to design ONE alarm that serves as both a fire alarm and a burglar alarm or are we designing an alarm and its two subclasses fire alarm and burglar alarm?

if its one for both i think there should be an alarm parent class and two subclasses, fire and burglar, and there is an alarmSystem class that holds an instance of each. though i must admit i am little confused as to what we are being asked to design

Alex Salazar

That's exactly the issue upon which I gave or removed points when grading this. Which is the better design? Mark Guzdial

Ok, I decided to subclass the alarm. Here is my design:

alarm.html

Susi Rathmann

The format is as follows

Classes

.....

Attributes

.....


Methods

Alarm
.....
owner
ID "a unique number so that the company will know the location"
.....

call: aMessage
automatedReaction
callOwner: aMessage
trigger
owner: anOwner
id: anID
owner
id

FireAlarm: subclass of Alarm
.....
.....

call
automatedReaction

BurgularAlarm: subclass of Alarm
.....
.....

call
automatedReaction

Owner
.....
email
phoneNumber
.....

email
phoneNumber
email:
phoneNumber:

Message
.....

send

Methods
.....
trigger

automatically does the respective automatedReaction
calls the owner
executes the "call" method

callOwner: aMessage

calls the owner

call: aMessage

whom to call when the Alarm is triggered. burgular alarm and fire alarm overwrite this with FireDept and PoliceDept calls respectively

automatedReaction:

for fireAlarm, sprinklers go off
for burgularAlarm, an audio alarm goes off

send:

sends message to the authority
the data includes the alarmID and its class (ie. burgular or fire)

Harper Maddox

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Final Exam Review - Sp2000 last edited on 20 April 2000 at 5:18 am by r66h24.res.gatech.edu.