General guidelines on how to design classes with best known industry practices.

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2answers
593 views

Thoughts and Best Practices on Static Classes and Members [closed]

I am very curious as to thoughts and industry best practices regarding static members, or entire static classes. Are there any downsides to this, or does it participate in any anti-patterns? I see ...
0
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2answers
284 views

Data structures VS Classes and what happens if they merge? [closed]

Alright so I've learned this: Classes have public methods that perform operations on the class's data and they hide away their implementations. Data structures on the other hand, completely expose ...
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1answer
72 views

how to manage new private variables introduced into class?

Whenever I want to add a new functionality, I introduce a new private variable into the class. Declare it just above the first method definition. leave a small comment. Set it in a certain method. And ...
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5answers
2k views

How can you decompose a constructor?

Lets say I have a Enemy class, and the constructor would look something like: public Enemy(String name, float width, float height, Vector2 position, float speed, int maxHp, int ...
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3answers
256 views

“Property Container” design-pattern in-depth definition

Could anybody, please, explain what is a Property Container or at least where can I get information about that pattern on the Internet? I've found that it exists as one of the Fundamental patterns in ...
2
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1answer
53 views

When should I pass setting-like value as class' variable and when as an assoc. array?

Following my other question, is there a general rule of thumb, when we should pass a setting-like value, that controls class' behavior (for example displayed texts) as as class' constant or variable, ...
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1answer
97 views

When should I pass value as class variable and when as a method argument?

Is there a general rule of thumb, when we should pass a value as as class variable and when as a method argument? Or is it just a choice of the developer? For example -- are there any reasons, why ...
0
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1answer
104 views

How can I layout this class to make it easier to use for API developers?

I have an application that allows the user to place a string of text into a PDF document. I have three different ways that they can do this: Use a Form Field. Then they have four properties to ...
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4answers
701 views

Call the database every time, or create an object in memory, and if so, how and how often to update?

I'm creating an app in javascript/nodejs and using neo4j as database. Let's say I have an entity User in my database. It has a bunch of properties, like boxes_collected and places_visited, which keep ...
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1answer
356 views

A class with only methods

What's the name for a class that has only methods? There are no fields/properties. Just two methods with the ability to parse some file in two ways. I have named the class Parser, but it just doesn't ...
9
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4answers
2k views

Why define a Java object using interface (e.g. Map) rather than implementation (HashMap)

In most Java code, I see people declare Java objects like this: Map<String, String> hashMap = new HashMap<>(); List<String> list = new ArrayList<>(); instead of: ...
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10answers
6k views

Can we live without constructors?

Let's say in some reason all objects are created this way $obj = CLASS::getInstance(). Then we inject dependencies using setters and perform starting initialization using $obj->initInstance(); Are ...
2
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1answer
357 views

C# dynamically linking different libraries and/or external classes

tl;dr Is it possible to include an external library (and create instances of objects represented within that library) based on some condition? This must be done at compile-time, so separate builds? ...
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1answer
200 views

An alternative to having fields that might not be used in a class

I'm writing a card/ board game in Java. Since the game has lots of cards that interact in different ways, my Player class has become sort of bloated with all these different fields used for keeping ...
2
votes
1answer
61 views

what's the proper way to organize code that straddles multiple objects?

Let's say I have the following classes: person, widget, foo_bars. A person can have multiple widgets and foo_bars. When an admin deletes a person, I want my code to do a cascading delete... and ...
13
votes
6answers
2k views

Should a class know about its subclasses?

Should a class know about its subclasses? Should a class do something that is specific for a given subclass for instance? My instincts tells me that is a bad design, it seems like an anti-pattern of ...
0
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3answers
378 views

PHP class data implementation

I'm studying OOP PHP and have watched two tutorials that implement user login\registration system as an example. But implementation varies. Which way will be more correct one to work with data such as ...
69
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9answers
6k views

Is there any “real” reason multiple inheritance is hated?

I've always liked the idea of having multiple inheritance supported in a language. Most often though it's intentionally forgone, and the supposed "replacement" is interfaces. Interfaces simply do ...
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2answers
330 views

OOP PHP make separate classes or one

I'm studying OOP PHP and working on a small personal project but I have hard time grasping some concepts. Let's say I have a list of items, each item belongs to subcategory, and each subcategory ...
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3answers
491 views

C# vector class - Interpolation design decision

Currently I'm working on a vector class in C# and now I'm coming to the point, where I've to figure out, how i want to implement the functions for interpolation between two vectors. At first I came up ...
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2answers
184 views

Subclassing to avoid line length

The standard line length of code is 80 characters per line. This is accepted and followed by the most of programmers. I working on a state machine of a character and is necessary for me follow this ...
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votes
3answers
600 views

How bad is it to have two methods with the same name but different signatures in two classes?

I have a design problem related to a public interface, the names of methods, and the understanding of my API and code. I have two classes like this: class A: ... function collision(self): ...
2
votes
2answers
356 views

Class design for calling “the same method” on different classes from one place

Let me introduce my situation: I have Java EE application and in one package, I want to have classes which will act primarily as cache for some data from database, for example: class that will hold ...
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2answers
1k views

How to handle lookup data in a C# ASP.Net MVC4 application?

I am writing an MVC4 application to track documents we have on file for our clients. I'm using code first, and have created models for my objects (Company, Document, etc...). I am now faced with the ...
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votes
2answers
1k views

How to deal with pointers from child to parent?

I have a class that represents a file in specific binary format on disk (the parent in the title) and another class that represents an object inside that file (child). When the object changes, it ...
6
votes
6answers
342 views

Fields vs method arguments [closed]

I just started writing some new class and it occurred to me that I was adding a lot of method arguments that are not strictly needed. This is following a habit to avoid having state in classes that is ...
1
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1answer
162 views

Class Design for special business rules

I'm developing an application that allows people to place custom manufacturing orders. However, while most require similar paperwork, some of them have custom paperwork that only they require. My ...
0
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1answer
264 views

Code design: is this specific case of monkeypatching in python acceptable?

I'm using python to do some research tasks. I have a class hierarchy for "tools", where each object is an instance of a particular tool. They all share some functionality and have many similarities in ...
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2answers
156 views

Is it valid to initialize an instance of a class within the same class?

I was wondering if it's valid to initialize an instance of a class within the same class? For example: public class Person() { string name; string age; public Person getPerson() { ...
0
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3answers
814 views

Have Superclass Contain List of Subclass?

For the GUI of a program, I want it to list several items, all of which are, from a programming side, just subclasses. They can add one of these items to a list. I don't want to hard-code which ...
0
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3answers
3k views

What is good practice when inheriting static classes isn't possible/allowed

I am developing a project in C# and due to a design decision it is not possible to have a static class inherit another static class. But I have, in my opinion, a case where this would make sense. I ...
2
votes
5answers
609 views

Why is TDD not working here?

I want to write a class A that has a method calculate(<params>). That method should calculate a value using database data. So I wrote a class Test_A for unit testing (TDD). The database access ...
1
vote
1answer
157 views

Is it evil to model JSON responses to classes when they are mostly smilar?

Here's the problem : While implementing a C# wrapper for an online API (Discogs) I've been faced to a dilemma : quite often the responses returned have mostly similar members and while modeling these ...
0
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3answers
180 views

which style of member-access is preferable [duplicate]

the purpose of oop using classes is to encapsulate members from the outer space. i always read that accessing members should be done by methods. for example: template<typename T> class foo_1 { ...
2
votes
2answers
2k views

When to use inheritance or composition/aggregation?

In general, how do I decide whether to use make a class a super class, or to make it a private data member of another class? For example, given two classes, how does one decide whether to do this: ...
0
votes
1answer
120 views

Refactoring classes with ref to themselves

How can I refactor this code? class Node { public Node Parent { get; set; } } class AVLNode { public AVLNode Parent { get; set; } } I tried to use inheritance, but then I have to use type ...
0
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3answers
226 views

How do you balance out code structuring (few big functions vs. many small ones)?

The golden rule of code structuring is always said as splitting into many sub functions is a good thing. Though I noticed it becomes a problem in complex applications when a class of e.g. 10 bigger ...
2
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2answers
763 views

Same constructor signature with different semantics?

Occasionally, I'm confronted with the problem that I have to provide some constructors in order to initialize objects with different sets of data. These sets can be mathematically transformed into ...
1
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2answers
110 views

When to store values in constants/finals

This might seem like an odd question, but I'm worried that I'm putting too many things as constants/finals at the top of my java class. I've started to put every value that is in my program into a ...
0
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2answers
227 views

What is the convention regarding class names that may already exist in the ORM?

This is a generic question about class names and ORMs, but for context; I'm working on a Flask web app in Python using SQLalchemy. I'm struggling with naming a new class that will contain the ...
9
votes
4answers
8k views

Is it a good practice to create a ClassCollection of another Class?

Lets says I have a Carclass: public class Car { public string Engine { get; set; } public string Seat { get; set; } public string Tires { get; set; } } Lets say we're making a system ...
3
votes
5answers
1k views

What classes to put exactly in a class diagram?

What classes must I put in a class diagram? Only classes used in Business Layer and associations between them? Or also other classes in the Data Access Layer, Service Layer, etc.?
8
votes
4answers
491 views

What would be the best way to store movements on a game to allow a rollback?

I'm developing a board game that has a game class that controls the game flow, and players attached to the game class. The board is just a visual class, but the control of the movements is all by the ...
0
votes
1answer
372 views

How can my code structure be improved? [closed]

I am looking for advice on the neatest way to structure my code. class Password { private string cipher; Password(string cipher) { this.cipher = cipher; } public string ...
4
votes
3answers
441 views

Why is it so difficult to know where to use interfaces,generics in program design?

I am attempting to learn c# from the head first series, in addition i also consult other books such as Pro C# by Andrew Tolson. Now the thing is that i perfectly understand the interface,generics ...
1
vote
1answer
220 views

Designing a list class with filtering and sorting

The app I'm developing needs to display lists of items. Simple enough, but there are a number of things which can change based on user input: Items can be added to/removed from the list. The items ...
19
votes
2answers
1k views

Is it a good idea to provide different function signatures that do the same thing?

Here is a C++ class that gets constructed with three values. class Foo{ //Constructor Foo(std::string, int, char); private: std::string foo; char bar; int baz; }; All of ...
3
votes
3answers
347 views

Architecting persistence (and other internal systems). Interfaces, composition, pure inheritance or centralization?

Suppose that you need to implement persistence, I think that you're generally limited to four options (correct me if I'm wrong, please) Each persistant class: Should implement an interface ...
8
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7answers
741 views

Is it appropriate for a class to only be a collection of information with no logic?

Say I have a class Person that has instance variables age, weight, and height, and another class Fruit that has instance variables sugarContent and texture. The Person class has no methods save ...
0
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3answers
608 views

UML - Class Diagrams Order -> Products

I have a class diagram that is like this: < Order > (1) CAN HAVE (M) < products > But therefore Order has the following: Order_Id Customer_Id Order_date_day Order_date_month ...