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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14 views

Extracting client specific code. refactoring possibilities required [duplicate]

I am facing a Design problem. I have a set of classes which writes data in XML,JSON or HTML formates for different clients. I have a class which receives Data and a XML, JSON or HTML writer as it ...
1
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1answer
175 views

Is SICP still relevant? [closed]

Today, I came across this book entitled:The Structure and Interpretation of Computer Programs I read the Table Of Contents and it really interests, me. It seems to be exactly what I've been looking ...
0
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1answer
70 views

Are there any strong reasons to use DI for sub-classes that are known to be tightly coupled to their parent containers?

I have Product classes for Products A through Z. And each Product class has its own set of product-specific subclasses, which I'd say are tightly coupled to them, like so: //specific product class ...
0
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2answers
110 views

Distinguishing Classes: How to catch system behavior in classes (Library System Case)

Suppose a Library System. if I think about Data, I can just distinguish Book, Member classes or at most Author or Publisher... (Are they only classes?), but I have some use cases, scenarios (Borrow, ...
8
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7answers
1k views

what should be logger's position in the parameter list [closed]

In my code I inject a logger to many of my classes through their constructor's parameter list I noticed that I put it randomly: sometimes it's the first on the list, sometimes last, and sometimes in ...
0
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1answer
101 views

2 Classes that share similar behaviours but unrelated.

I'm working on something at the moment and am a little confused. I'm working on an enquiry system in PHP (it's Opencart Based, so MVC). An enquiry comes in and depending on what form it was ...
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5answers
336 views

Interview Question - Adding Method to interface that has been implemented by thousands of class [closed]

There is scenario where I have Interface X, which has been implemented with my thousands of classes. Now I want to add new method in that Interface X. So how to make the changes in minimal way to ...
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3answers
120 views

Complex Number help

OK so I have a programming assignment and I need to create a class that represents Complex Numbers (good so far), add them to a list(good so far), and then output whether each individual number is ...
3
votes
1answer
258 views

OOP - How to refactor a “pyramid architecture”

Unbeknownst to me while I was building it, I built a "pyramid" architecture. I did not realize this until I laid it out in my new Visual Studio 2013 Layer Diagrammer. Each layer depends on the layer ...
5
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5answers
317 views

Should the method describe its side effects? [duplicate]

I was reading Clean Code by Bob Martin and there's one particular code smell, related to naming, that looks interesting to me: N7: Names Should Describe Side-Effects Names should describe ...
1
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3answers
193 views

OOP implementation doubts with databases

I was starting a project today and after designing the database structure and how the data would be stored etc, I started the implementation. I am doing this on php, but the language isn't really ...
0
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2answers
84 views

How to ensure a new Unit Test is for the correct Test Case? [duplicate]

When writing a unit test for a scenario believed to be already covered, ie, the first run of the test would be green, what is a good guideline to ensure that it is in fact testing the proper test ...
1
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1answer
226 views

Building Data abstraction for rational numbers using “objects”

I follow this definition of "object":An object is a value exporting a procedural interface to data or behavior. Objects use procedural abstraction for information hiding, not type abstraction. Object ...
0
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1answer
115 views

Big graph traversal with OOP

I'm trying to solve a algorithmic contest's problem. I have a matrix 2000x2000. I want to represent it as graph and traverse it with BFS/DFS. I have time limits on app running (2s). Simple vertices ...
3
votes
3answers
74 views

Child Object depends on member of Parent Object

I am wrestling with this OOP design issue. Take these base classes, for example: class Database { public string ConnectionString { get; set; } public Table MyTable { get; set; } } class ...
4
votes
2answers
240 views

Should I use properties for the properties of properties?

Sometimes I use some indirect properties to set or get some other sub-properties, I give an example class Page { public string MainText { set { MainParagraph.Text = value; } get { return ...
4
votes
4answers
261 views

Styleguide when coding in a static language [duplicate]

I am currently a junior engineer and keen on learning best practices and expanding my experience. My question concerns any static programming language such as Java, C#, C++ etc. When I am writing ...
0
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1answer
52 views

Methods accounting for all input to method

This is more of a conceptual question. Let's say that you had the following enum public enum FooEnum { ALPHA, BETA, GAMMA, DELTA; } And let's say you have the following method: ...
0
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1answer
62 views

Lock object in base class: private or protected? [closed]

I have a base class that contains some lists, queues, and other fields which determine its state. In the base class I only access these fields within a protected lock object since there could be ...
2
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0answers
53 views

What design pattern is used in this delegating scenario?

I am currently having to bend some framework API to fit my usecase. The framework provides generic interfaces such as public interface Processor<T> { T process(T t); } with various ...
4
votes
3answers
87 views

Sets of pair parameters

I have the following class, this class like many rely one parameters coming in as a pair. Originally for convenience, I set them as params Object[] values and check if there is an even number of them ...
1
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1answer
59 views

PHP MVC Model with a method to fetch all of the model from database

I have a crazy question, consider I'm developing a blog website, There is two model named Post and Comment, now I wanna add a method to fetch all comments from database, which model should I choose to ...
36
votes
11answers
4k views

Constructor-only subclasses: Is this an anti-pattern?

I was having a discussion with a co-worker, and we ended up having conflicting intuitions about the purpose of subclassing. My intuition is that if a primary function of a subclass is to express a ...
1
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1answer
153 views

Problems with OO design for application with pluggable components

I'm trying to refactor an ugly code and make it easly extendable in the future. The application should be nothing else but a series of components that have input(s) and output(s). The components ...
0
votes
1answer
96 views

Database object mapping, good practices [closed]

I think I've understood the basic idea behind object mapping but there is one gap in my knowledge base that I hope to fill now. First let me tell you what I understand out of the whole thing. I have ...
0
votes
2answers
77 views

PHP extended class method requires same signature including object class requirement? [duplicate]

Not sure exactly how to phrase the question succinctly for the title. I have a collection class that extends another collection class. The parent collection-class has a method addMember(someClass ...
1
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2answers
95 views

How is a dictionary better than a big switch, when mapping data to action? [duplicate]

Often times we see stuff like that in code: void myFunction(string someValue) { if (someValue == "a") { // ... } else if (someValue == "b") { // ... } else if (someValue == ...
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votes
1answer
198 views

Why every value is an object in python?

I know about writing programs (using C) that have: Data values, that are manipulated. For example: integer, float values etc.. functions (rules), by which data values are manipulated. object is a ...
0
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1answer
139 views

Get inspired by real world objects and their interactions [closed]

Based on this question I think while the aim of OOP is not necessarily to copy real world objects, they could be source of inspiration to design a software or solve a problem or even learn the OOP ...
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2answers
164 views

Smells in exception handling: how to separate between public and internal exceptions?

During the development of a small web API, we decided to separate internal exceptions from public exceptions. Public exceptions are HTTP exceptions, that translate into HTTP responses with proper ...
58
votes
11answers
8k views

Why is base-for-all-objects discouraged in C++

Stroustrup says "Don’t immediately invent a unique base for all of your classes (an Object class). Typically, you can do better without it for many/most classes." (The C++ Programming Language Fourth ...
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0answers
54 views

Injecting data processing logic into class

I want find more elegant and appreciate way to inject processors into CommandProcessorDispatcher class. Or it can be another one solution (the goal is separate each command processing logic to ...
1
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0answers
88 views

How and where to make global function file in jsp sevlet web application

I am making a website in Servlet&JSP. I am looking for good way to make a specific function file from where I can call and declare my common functions. If I made a java file function. Java, so is ...
0
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2answers
109 views

Organizing C++ Components [closed]

In my current company we've brought the discussion about how to organize most of our different C++ components considering the following requirements: There might be interdependencies between ...
2
votes
3answers
104 views

Enterprise application object oriented modeling for user and role

Generally in the Enterprise Applications like ERP or ERM, CRM, BP etc. we see two things a lot, one of them is Role and the other one is User. What happens is that in the real world we have some ...
2
votes
1answer
207 views

Object Oriented Analysis and Design workflow for developer working alone

Studying about OOAD I've found a simple workflow based on five steps. I don't work with a team, so what I'm interested in is a workflow that can be used by a developer working alone. The workflow I ...
0
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1answer
104 views

Protected properties vs protected getters

If I have an abstract Animal class with a $name property and constructor like this: abstract class Animal { protected $name; public function __construct($name) { $this->name = $name; ...
0
votes
2answers
260 views

What is the rule for nested loop code?

I am new to programming and currently learning Java from Stanford free learning course. There was this assignment that I had trouble translating my algorithm into code. I feel like I have a ...
17
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7answers
3k views

Why is instance creation the way it is?

I've learned C# over the course of the past six months or so and am now delving into Java. My question is about instance creation (in either language, really) and it's more of: I wonder why they did ...
1
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0answers
67 views

Is this pattern of optional dependency injection sound? [duplicate]

A lot of the time when working on legacy code bases, I find it hard to move manually created dependencies to the constructor parameters, because of a variety of reasons. Sometimes it's because the ...
7
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8answers
2k views

Relation between object orientation and algorithms

As I read some algorithms textbooks, they are full of clever procedures for some problems (sorting, shortest path) or some general methods (recursive algorithms, divide and conquer, dynamic ...
5
votes
3answers
251 views

Is prototypal inheritance inherently slower?

I see Javascript 6 will add traditional class based inheritance, and one argument I hear is that classes are inherently much faster than prototypes because they can be optimized away by the compiler ...
0
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3answers
385 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 ...
2
votes
1answer
247 views

Change routing to comply with Law of Demeter

I have a Task, Owner and Plan. Charge values are kept in a plan, owner is on a particular plan and task knows its owner. A task needs to setup its charges based on the knowledge the owner has. Owner ...
6
votes
2answers
314 views

What is the difference between Optionals and Nullable type

Swift has Optionals. C# has Nullable types. As far as I can tell both serve same purpose, besides value of some type they store information whether variable has value or is undefined ...
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vote
3answers
152 views

Controller in MVC

Alright so it is an essential part of OOP that one class should only do one thing, and it makes sense. In practice I've seen that classes which don't obey this rule get thick and cluttered. So I was ...
20
votes
4answers
1k views

Why would many duck-typed dynamic programming languages use a class-based approach instead of prototype-based OOP?

Since quite many dynamic programming languages have the feature of duck typing, and they can also open up and modify class or instance methods at anytime (like Ruby and Python), then… Question 1) ...
0
votes
1answer
102 views

Statistics about the usage of programming paradigms [closed]

I hear very often that the object-oriented programming paradigm is the most widespread. But are there any scientific statistics about how often other programming paradigms like procedural programming ...
1
vote
5answers
254 views

Should abstract classes be used to prevent instantiation

Is preventing the instantiation of a class a valid reason to make it abstract? For example, if I have a class called Gauge which has subclasses HeadingIndicator and AirSpeedIndicator, is it a good ...
3
votes
1answer
103 views

Creating variables in methods/functions

In how far do we create variables in our methods or functions? Do we only create one when we're using the result of the variable more then one time like this? function someFunction(SomeClass ...