Object-oriented design is the process of planning a system of interacting objects for the purpose of solving a software problem.

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Is self referencing tables a good idea for geographical data?

I am creating a design for different Geographical types where each type is just a little "place holder" in over all heirarchy. One example is Zip code Belongs to Territory Belongs to District ...
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387 views

Overriding equals() method in Java

Short question: Why does Java allow overriding equals(), why is it not final? I am reading Effective Java 2nd edition by Joshua Bloch. I am a bit baffled by the conclusion that There is no way to ...
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0answers
126 views

General design choices. How do you decide?

I have a project in C that I'm looking to convert to C++. The project does white box hardware testing of a device (actually many similar devices). In this case the device has two processors. Each ...
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2answers
80 views

Literal strings vs. object properties in JavaScript

JavaScript libraries in the same space (UI widgets) use two different approaches for instantiating components: Literal strings to specify types, and inlining as much as possible, for example: var ...
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6answers
228 views

What is a better design a light weight user or a heavy weight heavy user model?

This is a design question and I am confused about how to design my user object. As in most systems, user is the central part of my application and a lot of information scattered around my database ...
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3answers
210 views

Avoiding a large amount of overloads

I'm currently writing a mailing interface for our enterprise application. Dependent on the send mode (regular email, bulk email, templates, mailmerge, ...) our Send() method requires a bunch of ...
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6answers
1k views

Does functional programming increase the 'representational gap' between problems and solutions? [closed]

Since machine language (e.g., 0110101000110101) computer languages have generally evolved to higher forms of abstraction, generally making it easier to understand the code when it's applied to a ...
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1answer
55 views

refactor by inheritance or composition for large class that depend on common state [duplicate]

I have a huge class (>1000 lines), in which all methods depend on a small set of attributes in that class. I can think of 2 quick ways of refactoring. I keep it as a huge object, but split related ...
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2answers
68 views

Architecture for process that can be invoked to return errors as well as silently [closed]

I'm looking for some high level design/architectural input for the following. I have "some business process" I am writing in code (the importing of data from various CSVs into a database. There is ...
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1answer
122 views

Should I use one class that calls Several static methods or several classes each calling one static method

I need to use instances which represent mathematical functions along with their parameters end enable their evaluation. I can take 2 approaches: 1: have a single class representing all the math ...
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1answer
53 views

Know any good resources/information on architecting an iOS app? [closed]

I spent a few months working on an iOS app of mine (in Swift) before realizing it was really a bunch of MVCs (Massive View Controllers). I want to start fresh and build something modular, scalable, ...
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4answers
175 views

Options for constructing an object that is not logically initialized until all fields are set

I am working on a Pokemon game at the moment, and am running into some design concerns. The easiest example is as follows: Each Species of Pokemon has several traits that are required before it is ...
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4answers
195 views

What is the efficient way to eliminate duplication? Design patterns?

I have a helper class which has a method that perform some checks against a field in a model. I have two models, ModelA and ModelB, they have some similarities but not all. One of them is they both ...
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5answers
517 views

Should I create a single object for a common method call or use a throw away approach?

I'm creating a little rpg fight program just for fun and to practice my java (I'm pretty new hehe). I have a class called Dice with a method called d20 that rolls a random number between 1 and 20. ...
2
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1answer
85 views

Advice for Evaluating Web Frameworks (or software libraries in general)

At my workplace we are currently looking to redesign our application stack on the web. We are satisfied and accepted that our server will be Node.js but we are finding it very difficult to find a ...
2
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4answers
264 views

Two classes that behave identically yet are semantically different

I am writing a program which is a similar to Ruby's Active Record Migrations, in which that every migration has both an "Up" and "Down" in terms of creating a change to the database, "Up" meaning ...
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2answers
95 views

How do you decide member objects?

So OOP is about breaking down functionality, making each class responsible for one thing etc. But let's take the example where an object is using another object. First thing that comes to mind ...
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3answers
118 views

where should put showSchedule method in school system

In my school management system I have this partial class diagram: 1- In one use case student want to see his schedule of classes in week. this is what i suppose to do: get student object from ...
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3answers
212 views

Object creation: when should I expose a factory vs wrapping class?

I am having some problems trying to figure out when to use a factory or to wrapper class. This question is slightly geared towards C# I guess, so I'm not sure if this is the correct place to ask. Say ...
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2answers
401 views

many to many relation in database schema and oop class diagram

I have Student and Group entities. Student can have many groups and Group can have many students too. so in database I should have middle class and change many-to-many relation to one-to-many and ...
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2answers
82 views

Query on hiding implementation details in java

With the below piece of thread related code, I see that author of Thread class is hiding the details about the working of start() method. What a user of Thread class need to know is, class Thread ...
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2answers
497 views

What are the valid uses of static classes?

I noticed that nearly every time I see programmers using static classes in object oriented languages such as C#, they are doing it wrong. The major problems are obviously the global state and the ...
3
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3answers
174 views

Is it misleading to label code as a particular design pattern if it only loosely fits the definition?

Background: I have a rough, but working understanding of ~15 design patterns. It's been my experience using design patterns in my own projects that the resulting implementations usually end up as some ...
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2answers
106 views

Interface inherits from interface without specifying new member

Is it some kind of bad design to have something like this: public interface IFooStream { long Length { get; } long Position {get; set;} //... } public interface ...
2
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1answer
223 views

C# OOP Class Usage [duplicate]

I am just being picky and really wanted some of my code to look, feel, and be used a specific way but am not sure if its possible. I have a class I created that can be used like this ...
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3answers
186 views

Getters and Setters unclear example

I know autmatic getters and setters are considers bad as they tend to break object's encapsulation. They also move the work that should have been done within the object outside. Allen Holub is a big ...
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3answers
783 views

Best OOP Practice in C#: Passing the object as parameter VS creating a new instance of the object

First things first, I would like to know if passing an object as parameter is much better than creating another object AGAIN in a class that will use it again and second what are the pros and cons of ...
4
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1answer
118 views

Extend, wrap, or both to add generics to a class that should have had them?

So I'm using a C# framework that has a great example of where generics would be useful, except they weren't used. For simplicity's sake, we will say it was a list (I know C# has its own list), but ...
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1answer
138 views

Sharing constructor code between classes that do not inherit from each other

There is a PHP library of classes (generated from a WSDL) that cannot be changed. These look like the below for simplicity. class System extends \SoapClient { public function __construct(array ...
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1answer
108 views

Should Form Object be considered a DTO?

I got this from one of online video tutorials. Author binds form data not to Value Object directly, but first to validable DTO, and THEN to Value Object, using service. Example: package ...
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5answers
218 views

Specific empty children classes

Is having empty children classes, just to specify, a bad practice? Lets suppose I've a generic Product class. There are electrical, electronic and mechanical products. I need to represent all them ...
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1answer
58 views

Do the implementations of the Node interface in Web API violate Liskov Substitution Principle?

MDN article on Node interface states that interfaces [that inherit from Node interface] may return null in particular cases where the methods and properties are not relevant. They may throw an ...
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1answer
104 views

What are the key areas to evaluate software (codebase) on? [closed]

I have been asked to do a code review of about 50 applications over a period of 6 weeks. (Management has changed and the new CTO asked for an full internal software audit) I am wondering, what are ...
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3answers
513 views

Should an object load itself?

although I'm programming in C++ for some time now, I'm always faced with design decisions (probably due to the language's flexibility). One such problem is deciding if a method should be part of the ...
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1answer
153 views

Too many parameters to data processing class constructor

I have a conceptually simple application: data comes in as small encrypted packets, they decrypted and validated, some are stored in the database, some rules are applied, and a reply might be ...
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0answers
64 views

Need to refactor file downloader and post processing utility [duplicate]

Not sure whether this is the right forum to ask this but here goes. Using this solution - http://stackoverflow.com/questions/26571351/replacing-if-else-logic-with-state-strategy-pattern I was able to ...
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4answers
760 views

try/catch open/closed principle violation

I have three or more different custom exceptions that a class can throw and I need to use try/catch in order to discover which exception was thrown. In my point of view this piece of code violates ...
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0answers
70 views

OO Design Question - Library/Objects for API which includes id references

Public api: getClients / getClientById - returns a json object like: { clientid: 1, name: "Client1" } getProjects / getProjectById - returns a json object like { projectid: 5, name: ...
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4answers
987 views

Why 'List<E>' is an 'interface' but not 'abstract class'?

While defining the hierarchy, one can think to embed the abstract method(behaviour) in abstract class only because the derive concrete class posses that as core behaviour with it's specific ...
2
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1answer
227 views

Program Architecture: How to manage objects that are interdependent

Consider the following case, image I making a simple chat program; I want it to be extensible such that it would be fair easy to add add different scripting and user interfaces. I want the core ...
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3answers
122 views

OOP: relying on protected properties in a class-subclass contract

I'm coding in Python, but the question seems independent of programming language. I have a class that represents some system check: class Check: @abstractmethod def run() """ You have to ...
7
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2answers
239 views

Autoreleasing objects in Reference Counting Systems

I'm experimenting a bit in C and I'm trying to implement my own Reference Counting System. I've mainly worked with Objective-C in the past but AFAIK autoreleasing objects is something that is unique ...
2
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1answer
176 views

DDD: Global unique identities vs surrogate

Let's start with an example: we have an entity: Book. It has unique identity: Isbn - a value object that wraps a String. This is an UUID. The Book entity also needs a surrogate id from the repo (sql ...
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1answer
50 views

DDD: storing additional data with the model

Our domain is operated within certain context. This context is described by some additional values, like a fooId - id that does not have a meaning in domain business, but it's more a flavor for the ...
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1answer
82 views

DDD: Alternative view of the Model?

I have a model class, let's say it's a Book. I need it to be displayed on the screen. I want to have an escaped version of it, so I do not need to escape fields manually. What should I do? I can ...
2
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4answers
222 views

Determining a class structure

I'm currently in the early stages of designing an e-commerce application. I'm working out some designs for my classes which have so far been fairly straightforward, but I've run into something of a ...
3
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2answers
164 views

Model object and additional attributes

I have a model e.g. Book. Besides 'natural' attributes of a book, I have some mandatory IDs I need to carry on, like companyId, groupId. They are related to which organization unit this book belongs ...
3
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1answer
251 views

How to store a potentially large amount of optional properties of objects?

I'm using Entity Framework Code First with ASP.NET MVC. This handles my database design based on the domain models within my application. As it stands, the engine I'm writing will have a website ...
0
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2answers
139 views

Should I have an object as attribute or primitive id? [duplicate]

I am wondering which principle should I use. Here is my situation. I have a class named TravelOffer. This class looks like this: public class TravelOffer { private final long id; private ...
0
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1answer
147 views

What should be in a PIMPL?

I am kinda trying to implement a windowing library in C++, the circumstances are forcing me to implement it all myself, that's not the point of this question however. My question is: What should be ...