A methodology that enables a system to be modeled as a set of objects that can be controlled and manipulated in a modular manner
3
votes
5answers
298 views
What can go wrong if Liskov substitution principle is not followed while coding?
I was following this highly voted question on possible violation of Liskov Substitution principle . I know what Liskov Substitution principle is but what is still not clear in my mind is what might ...
5
votes
1answer
113 views
How to verify the Liskov substitution principle in an inheritance hierarchy?
Inspired by this answer:
Liskov Substitution Principle
requires
that
Preconditions cannot be strengthened in a subtype.
Postconditions cannot be weakened in a subtype.
Invariants ...
3
votes
2answers
127 views
Something similar to Objective-C categories in other languages?
I understand Objective-C categories and how they become useful, but I always have a hard time explaining the concept to other programmers that are not familiar with Objective C.
Maybe I'm just bad ...
1
vote
1answer
54 views
Object behaviour or separate class?
When it comes to OO database access you see two common approaches - the first is to provide a class (say "Customer") with methods such as Retrieve(), Update(), Delete(), etc. The other is to keep the ...
1
vote
3answers
223 views
good literature for teaching object oriented thinking in C [closed]
Quite often C is the primary platform for the development. And when things are large scale, I have seen partitioning of the system as different objects is quite a natural thing. Some or many of the ...
3
votes
4answers
355 views
How much is modern programming still tied to underyling digital logic? [closed]
First of all: I've got no academic background. I'm working primarily with Java and Spring and I'm also fond of web programming and relational databases. I hope I'm using the right terms and I hope ...
11
votes
2answers
252 views
Looking for some OO design advice
I'm developing an app that will be used to open and close valves in an industrial environment, and was thinking of something simple like this:-
public static void ValveController
{
public static ...
6
votes
2answers
166 views
Help to understand the abstract factory pattern
I'm learning the 23 design patterns of the GoF.
I think I've found a way to understand and simplify how the Abstract Factory works but I would like to know if this is a correct assumption or if I am ...
2
votes
1answer
26 views
Validation and Error Generation when using the Data Mapper Pattern
I am working on saving state of an object to a database using the data mapper pattern, but I am looking for suggestions/guidance on the validation and error message generation step (step 4 below). ...
3
votes
2answers
269 views
Design pattern and best practices [closed]
I am an iPhone developer. I am quite confident on developing iPhone application with some minimal feature. I would consider myself as a fair application developer but the code I write is not so much ...
16
votes
5answers
670 views
Why am I seeing so many instantiable classes without state?
I'm seeing a lot of instantiable classes in the C++ and Java world that don't have any state.
I really can't figure out why people do that, they could just use a namespace with free functions in C++, ...
4
votes
4answers
100 views
How to implement isValid correctly?
I'm trying to provide a mechanism for validating my object like this:
class SomeObject {
private $_inputString;
private $_errors=array();
public function __construct($inputString) {
...
1
vote
3answers
117 views
Any tips/tricks/resources on actually TEACHING a class on OOP? [closed]
I may slowly be getting into teaching an Object-Orientated Programming class at my school in a year or two. I just graduated and work at my school as an Application Programmer. I'd first start off as ...
25
votes
12answers
5k views
Isn't MVC anti OOP?
The main idea behind OOP is to unify data and behavior in a single entity - the object. In procedural programming there is data and separately algorithms modifying the data.
In the ...
6
votes
2answers
96 views
How far should an entity take care of its properties values by itself?
Let's consider the following example of a class, which is an entity that I'm using through Entity Framework.
- InvoiceHeader
- BilledAmount (property, decimal)
- PaidAmount (property, ...
