Solved

object oriented programming real examples

Posted on 2013-10-22
8
335 Views
Last Modified: 2013-10-29
I am looking for real world explanations of object oriented programming


A student is an instance of a class
a house is an instance of a housing community
0
Comment
Question by:rgb192
  • 4
  • 3
8 Comments
 
LVL 16

Expert Comment

by:krakatoa
ID: 39592290
No, they are not instances - an instance is a 'concrete' object. They are classes and subclasses in the hierarchy.
0
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 39592323
I would say that a class is a collection of students, and a housing community is a collection of houses. Or in C# terms:

public class Studen
{

}

public class Class : ICollection<Student>
{

}

public class House
{

}

public class HousingCommunity : ICollection<House>
{

}

Open in new window

0
 
LVL 75

Accepted Solution

by:
käµfm³d   👽 earned 500 total points
ID: 39592350
Now, to get more object-oriented, let's extend the house route. A house is a building, yes?

e.g.

public abstract class Building
{

}

public class House : Building
{

}

Open in new window


But a skyscraper is also a building, correct?

public class SkySkraper : Building
{

}

Open in new window


What would you consider a city block to be? I think of it as a collection of buildings:

public class CityBlock : ICollection<Building>
{
    private List<Building> myBuildings = new List<Building>();

    public void Add(Building item)
    {
        this.myBuildings.Add(item);
    }

    // Remaining ICollection methods
}

Open in new window


Since it contains Buildings, then theoretically it could have both houses and skyscrapers, right?

static void Main(string[] args)
{
    CityBlock block = new CityBlock();

    block.Add(new House());
    block.Add(new SkyScraper());
}

Open in new window


One part of object-oriented programming deals with polymorphism--which what I believe you are asking about. Polymorphism is treating an object like it is something else under different contexts. Above, I created a new House and a new SkyScraper (two different kinds of objects, I'm sure you'll agree), but when I added them to the block I treated them as Buildings. I could do this because both the House and the SkySkraper inherit the Building base class.

Polymorphism is a bit more broad than what I've described above. Digest the above first, then we can follow up with remaining questions you have  = )
0
Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
LVL 16

Expert Comment

by:krakatoa
ID: 39592388
kaufmed - pity no Java there. ;)
0
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 39592393
My Java kung-fu is not that strong, so I didn't want to embarrass myself  ; )
0
 
LVL 16

Expert Comment

by:krakatoa
ID: 39592403
But it might have embarrassed me. Or helped me, more likely. ;)
0
 
LVL 16

Expert Comment

by:krakatoa
ID: 39592421
(Sorry, deleted this comment - too involved.).
0
 

Author Closing Comment

by:rgb192
ID: 39610827
Good example of complex usage.

Thanks
0

Featured Post

Active Directory Webinar

We all know we need to protect and secure our privileges, but where to start? Join Experts Exchange and ManageEngine on Tuesday, April 11, 2017 10:00 AM PDT to learn how to track and secure privileged users in Active Directory.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article aims to explain the working of CircularLogArchiver. This tool was designed to solve the buildup of log file in cases where systems do not support circular logging or where circular logging is not enabled
The article shows the basic steps of integrating an HTML theme template into an ASP.NET MVC project
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…
Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…

828 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question