?
Solved

when do you use mustoverride in what kind of situations. I need a good example to understand the feature.

Posted on 2011-03-14
5
Medium Priority
?
265 Views
Last Modified: 2013-11-05
when do you use mustoverride in what kind of situations. I need a good example to understand the feature.
0
Comment
Question by:Jsara
  • 2
4 Comments
 
LVL 2

Accepted Solution

by:
murphomatic earned 500 total points
ID: 35131872
A good example would be a situation where you're creating a base class, but all the inheriting classes will need to implement their own functionality for a particular method.  

Let's say you're creating a base class called "Vehicle," which contains a MustOverride method called "Drive".  You'll be creating several classes that inherit from vehicle - such as "Boat," "Truck," "Tank," ...etc ...  All are vehicles, but each have a very different implementation of "Drive."

You could do this with an interface/abstract class - but in that case, ALL of the methods in the interface would be essentially MustOverride.  If you create a base class for Vehicle - you can write implementation code for other various parts, and then have "Drive" be the only method you declare as MustOverride, requiring each child class to implement its own version of "Drive."

Hope this helps!
0
 
LVL 1

Assisted Solution

by:pjbaratelli
pjbaratelli earned 500 total points
ID: 35132098
Just to expand this section:


Let's say you're creating a base class called "Vehicle," which contains a MustOverride method called "Drive".  You'll be creating several classes that inherit from vehicle - such as "Boat," "Truck," "Tank," ...etc ...  All are vehicles, but each have a very different implementation of "Drive."

Changing MustOverride method from  "Drive" to "Move"

When you use the Vehicle bass class containing MustOverride, the other classes that would inherit this class would have to have the method "Move" in it.  The method would control how each type of Vehicle Moves.  

A boat moves only on water, so logic would be placed to determine movement in water.  
A car drives on roads (mostly), so logic would be placed to determine movement on a road.
A truck drices on roads and off roads, so logic would be placed to determine move on and off a road

etc........

To conclude, you use "MustOverride" in the above example because all vehicles Move differently and it forces each vehicle to Move in some way shape or form.  




0
 

Author Comment

by:Jsara
ID: 35142386
thanks. It helps.
0
 
LVL 2

Expert Comment

by:murphomatic
ID: 35142401
To be fair - while pjbaratelli's comment added clarification, ultimately it is my answer that deserves the points awarded for this question.  Can you please assign the points appropriately?

Thanks -
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

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

The ECB site provides FX rates for major currencies since its inception in 1999 in the form of an XML feed. The files have the following format (reducted for brevity) (CODE) There are three files available HERE (http://www.ecb.europa.eu/stats/exch…
If you need to start windows update installation remotely or as a scheduled task you will find this very helpful.
As many of you are aware about Scanpst.exe utility which is owned by Microsoft itself to repair inaccessible or damaged PST files, but the question is do you really think Scanpst.exe is capable to repair all sorts of PST related corruption issues?
The Relationships Diagram is a good way to get an overall view of what a database is keeping track of. It is also where relationships are defined. A relationship specifies how two tables connect to each other. As you build tables in Microsoft Ac…
Suggested Courses

578 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