A methodology that enables a system to be modeled as a set of objects that can be controlled and manipulated in a modular manner

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2
votes
6answers
739 views

Confusion about inheritance

I know I might get downvoted for this, but I'm really curious. I was taught that inheritance is a very powerful polymorphism tool, but I can't seem to use it well in real cases. So far, I can only ...
2
votes
6answers
811 views

Should I use automatic properties?

I'm new to C# coming from a Java background. I'm working on a take home assignment for a coding interview. I normally write my code as following(Java): public class Test { //fields private ...
0
votes
1answer
115 views

Should I use a class as a wrapper?

Lets say I have a class representing a chemical compound class Compound(networkx.Graph): def __init__(self): super(Compound, self).__init__() And lets say that I want to add some ...
1
vote
1answer
53 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 ...
-1
votes
2answers
72 views

what is the difference between inclusion and inheritance [duplicate]

the question is self explanatory, I just want to know when to use the inclusion and when to use inheritance, and which one serves for re-usability. in other words, which one meets the Object ...
3
votes
1answer
106 views

Why 'JButton' is-a 'Container' in javax.swing?

As per the class hierarchy in java.awt.*, class Button & class Label is-a class Component, and Component is not a Container, which make sense to me. As per the redesign of class hierarchy in ...
2
votes
3answers
281 views

Inheritance in imperative programming

My first introduction to programming was Java, which was horrible so I learnt Actionscript3 which was nice... "The point is" OOP was my introduction to programming where by I went on to gain a career ...
1
vote
2answers
57 views

Query on Recursive composition

For the below relation between Container and Componentin java.awt class hierarchy, I see that, in addition to is-a relation, class Container has composite relation with class Component with below ...
0
votes
1answer
78 views

Does class Availability makes programming as Object Oriented Language? [duplicate]

Does class Availability makes programming as Object Oriented Language ? Most of the people think that if there is Availability Class in a language, then that language becomes Object Oriented. Is it ...
1
vote
2answers
258 views

When should I refactor a private class into a package-private class?

When I began implementing a class in my system (let's call it A), I realized I needed some kind of object that does something. So I needed a new class (let's call it B), but I made it a private static ...
0
votes
2answers
176 views

if a c# interface contain only getter and setter definition, is it a code smell?

A project that I am working on has the following code for interface example: using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Test { public ...
2
votes
4answers
217 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 ...
0
votes
1answer
102 views

Coupling in OOP Contracts: Many simple values of few complex objects as arguments?

When designing an OOP-based application, should one prefer to transfer information between objects through complex objects that do a lot of handling work, or should I retrieve the data from the ...
16
votes
8answers
24k views

Web Developer interview questions

I read an article today that listed some basic questions about web development: Describe how POST data was submitted to a server by a browser. Explain a number of HTTP status codes (except maybe 404 ...
-1
votes
3answers
142 views

Objects in smalltalk and c++ [closed]

I have a question based on SmallTalk and C++. In one of the programming languages books, there is a question like: "Does an object in Smalltalk require its own private stack? What about in C++?" ...
0
votes
2answers
203 views

Bad Practice using Auto Generated Classes for Data Access

I've seen this before but haven't found concrete reasons. When you add Entities to your EF model, EF auto generates classes for these entities. In terms of DataAccess, why is it preferred to not ...
1
vote
1answer
228 views

Entity Component System Coupling

Lately I've been working on a small personal project which is basically an Entity Component System framework with autoupdated Systems. While I have a pretty good idea on the way the framework should ...
0
votes
1answer
142 views

The ViewController design in iOS vs MVC in tradiational web apps design

As I came from the background of webapps and move to iOS programming, I am wondering why we can't just apply the MVC design approach to native apps, i.e. in iOS, the view and controller are tightly ...
1
vote
2answers
133 views

Python: Object initialised inside a Class?

Is possible and, if so, common practice to initialize an object inside a class in Python? self.field = Class()
4
votes
3answers
243 views

Reducing dependency cycles and reducing coupling

I'm trying to learn how to produce quality object-oriented code and have been studying concepts like SOLID. I'm currently working on an entity-component-process system for a small game engine. ...
3
votes
4answers
386 views

Understanding UML composition better

The difference between Composition and Aggregation in UML (and sometimes in programming too) is that with Composition, the lifetime of the objects composing the composite (e.g. an engine and a ...
0
votes
3answers
249 views

I want to understand clearly why can't we instantiate an object of an abstract class [duplicate]

Can I get a clear explanation why why can't we instantiate an object of an abstract class. I know abstract is not real. But I want to know more why can't we instantiate an object of an abstract class. ...
0
votes
3answers
111 views

Communicating between unrelated components/objects

Imagine that I have a game, with Monsters, Missions, Vehicles, and of course their controllers and such, so a Monster class, Mission Controller class, Vehicle Controller class and so on. Suppose that ...
5
votes
1answer
2k views

Why is imperative programming preferred over functional programming? [closed]

Background: I am proponent of functional programming who works at a VB.NET shop where the prevailing mental model is imperative programming. Being that foundation of our system is WinForms I can ...
2
votes
1answer
239 views

Convert procedural code to object oriented

I have a PHP application (a web service). It consists of files grouped in directories by theme like :      /customer         /search.php with this example content : Auth::authenticate($options); ...
0
votes
3answers
331 views

Force Derived Class to Implement Static Method C#

So the situation is like, I have few classes, all of which have a standard CRUD methods but static. I want to create a base class which will be inherited so that it can force to implement this CRUD ...
3
votes
2answers
258 views

Does this Decorator implementation violate the Liskov Substitution Principle?

Please consider the following implementation of the Decorator design pattern: WordBank objects store strings and return them to the client through the method getWords(). The decorator class, ...
1
vote
1answer
122 views

Inheritance, Composition and Protocols

I'm reading a book on general object oriented concepts to try and gain a solid understanding of everything. One thing that is throwing me off is the difference between Inheritance and Composition. I ...
1
vote
1answer
169 views

Should we use data object (or the data transfer object) for sharing data between these three classes?

I found an article by Martin Fowler that has made me doubt my design choices, particularly about data objects. Martin Fowler has written an article about what he thinks is a code smell. In this ...
1
vote
1answer
83 views

Setting fields of a base class when using the constructor is not an option

I am refactoring a base class, implementations of which are plug-ins, loaded at runtime by another class using reflection. The class I am refactoring uses a user ID of the form domain\user. I need ...
2
votes
2answers
58 views

How to ORM non-disjoint specializations

Consider this highly simplified sample of relational data (each table may be involved in one-to-many and many-to-many relationships not shown here): people +-------+------+--------+ | name | born | ...
3
votes
3answers
362 views

Should we add constructors to structs

We often use c++ structs to define data structure as opposed to class which can be a complete module with member methods. Now deep down, we know they both are the same (loosely speaking). The fact ...
2
votes
2answers
73 views

Domain/Model objects attributes good practices

Simple question: Should model/domain objects only include attributes that are meant to be persisted in a database or serialized to any other specific format? My understanding of a domain/model object ...
3
votes
2answers
125 views

OOP CLI menu structure organization?

This problem has kept me from pursuing a project I'm working on because it influences the entire structure of the application. This question has been briefly touched on here, but I feel that it wasn't ...
13
votes
10answers
2k views

Can objects constructed from the same class have unique method definitions?

I know this seems like a weird question, since the point of two or more objects sharing the same class is that their behavior is the same, i.e. their methods are identical. However, I'm curious if ...
3
votes
0answers
66 views

Advantages and drawbacks of different ways using Either-types

I am writing software for compiling programs. Therefore have a Compiler that compiles a given sourcecode. It then returns a CompileResult that is similiar to an Either type (it is actually internally ...
1
vote
1answer
266 views

How does a search functionality fit in DDD with CQRS?

In Vaughn Vernon's book Implementing domain driven design and the accompanying sample application I found that he implemented a CQRS approach to the iddd_collaboration bounded context. He presents ...
1
vote
2answers
85 views

Is composition and aggregation really a type of association relationship?

From Wikipedia: There are four different types of association: bi-directional, uni-directional, Aggregation (includes Composition aggregation) and Reflexive. From what I know: Composition ...
0
votes
3answers
118 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 ...
4
votes
2answers
971 views

How does MVC work with the principle “Tell, Don't ask”?

Procedural code gets information then makes decisions. Object-oriented code tells objects to do things. — Alec Sharp So, when a view wants to display some information that is suppose to be ...
-1
votes
1answer
40 views

How do Event Bus and ReativeX interact with each other?

I wanted to look into communication/decoupling patterns and how to improve them. My current approach is to have a centralized commander in the form of an Event Bus and make him be the one to respond ...
18
votes
8answers
17k views

What's the difference between “use case”, “User Story” and “Usage Scenario”?

Is there an exact, but simple and understandable defintion of the distinction between "use case", "User Story" and "Usage Scenario"? there are quite a bunch of explanation, but right now, I see no ...
-2
votes
1answer
85 views

Architecture - 3D Modeling Library

I'm writing a library to allow users to generate 3D models programatically. User writes code (e.g. Square(4)) User views preview of 3D model (with built in visualizer) User can "print" the model to ...
-2
votes
1answer
63 views

Naming of classes [closed]

I am creating an Email sending client. My POJO domain model conssts of 2 string fields, userName and userId. My thought process around designing the classes was to club these 2 fields into a domain ...
20
votes
11answers
1k views

Does Refactoring towards Looser Coupling and Smaller Functions affect Speed of Code? (and should I care)

In Computer Science field, I have noticed a notable shift in thinking when it comes to programming. The advice as it stands now is write smaller, more testable code refactor existing code into ...
4
votes
2answers
727 views

What is the difference between Encapsulation and High cohesion?

I've looked at encapsulation and cohesion, but they look like the same thing to me. Isn't an encapsulated object already highly-cohesive?
0
votes
1answer
280 views

How to store an object state/data for later processing?

What do you think would be the most effective solution to maintain an object status through a life cycle? The goal to be able to be continue from any state any time. During the life cycle likely to ...
2
votes
2answers
375 views

Generics in low level languages

I'm developing a language like Vala and OOC that compiles back to C. This means that, eventually, every feature needs to be adoptable to C code in some way or another. Generics is one of the features ...
3
votes
3answers
231 views

Interface to enumerate over files

I'm trying to design a generic interface for enumerating over a list files. Each iteration will open a file, allow the consuming code to access the file to perform some task, and then close the file. ...
25
votes
8answers
2k views

What is the real responsibility of a class?

I keep wondering if it is legitimate to use verbs that are based on nouns in OOP. I came across this brilliant article, though I still disagree with the point it makes. To explain the problem a bit ...