[Year 12 SofDev] object descriptions

[Sonia McDonald]

Hi Maggie,



In answer to your question, I'll give a bit more info (you may already know this)...



Objects are models of something that can do certain things and have certain things done to them. Formally, an object is a collection of data and associated behaviours.



Data in this instance represents the individucal characteristics of a certain object. A class of objects can define specific characteristics that are shared by all instances of that class. For example, if we have four grapes on the table in front of us, each grape may have a different weight. The weight is a characteristic called an attribute.



Behaviours are actions that occur on an object. The behaviours that can be performed on a specific class of objects are called methods. Methods are like funcitons, they house parameters and values. For example, one grape method may have a 'pick' and a 'squeeze' action.



In this instance, I believe that object descriptions are to describe what data and behaviours the objects have.



I usually get my kids to put it in a table:



Object                   Description

Grape                      Has the 'pick' and 'squeeze' methods.



Then I get them to further clarify by describing what the methods do in pseudocode.



Hope this helps.



Kind regards,



Sonia McDonald

Teacher of Information Technology/Multimedia - Garnsey Campus



________________________________
From: sofdev-bounces at edulists.com.au [sofdev-bounces at edulists.com.au] on behalf of Margaret Iaquinto [iaquinto at ozemail.com.au]
Sent: Sunday, 2 September 2012 12:10 PM
To: SD List
Subject: [Year 12 SofDev] object descriptions

Would someone out there, who understands heaps about OOP, please give an opinion or example of what we should expect from 'object descriptions'?

It is found in the KK for U3O2:

methods of expressing software designs using data dictionaries and data structure diagrams, object descriptions and pseudocode


Maggie
(ICT at St Leonards)


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