Questions tagged [class]

A template for declaring a type of object.

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3answers
206 views

Does wrapping functions/'things' in classes reduce efficiency?

I was reading some C++ object-oriented programming notes that mentioned that we should avoid wrapping functions in classes if it is not required, since wrapping 'things' in classes would reduce ...
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Is using C++ Classes to handle commonly used parameters a misuse of classes?

My team works on an HTTP web server in C++. The codebase has aged over time, and has a widespread problem of 12+ parameters being passed to every function. A fake example: We need to build a Car, but ...
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4answers
292 views

How to deal with different level of abstractions (blurred line between data and models)

My question is about the way to represent data models created at runtime. To illustrate, let's say we would like to create a CMS-like app in which end-users may create custom forms. Those forms are ...
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3answers
66 views

“Assign” Role Association between two classes

If there is Class A and Class B and there is an association that B can be assigned to A.And the multiplicity is 1:M or M:1 from A to B.Example: 1.Room has Collection of Keys, and Key can can assigned ...
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3answers
175 views

Enums or Multiple Inherited Classes

I am reading about OOD and came across Parking lot design problem.Parking lot has parking floors which has parking spots.The parking spot class looks as follow: public enum ParkingSpotType { ...
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0answers
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Update class member gradually [duplicate]

Consider the following: import typing class MyClass(object): def __init__(self): self.my_member: typing.Optional[dict] = None def update_member(self): self.my_member = {} ...
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4answers
364 views

Why have separate keywords for 'extends' and 'implements' in Java? [closed]

Short answer that I've come to accept: Firstly, it helps with readability, being able to see which is the superclass apart from interfaces. Secondly, though 'extends' and 'implements' do the same ...
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2answers
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Going from Javascript to C++. I have teacher and student objects, and I want to display if they are teachers or students. How should I do this?

This may be too general of a question, but basically whenever I try to find an answer for something that would work from a Javascript approach, the answer heavily implies that you wouldn't do it that ...
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2answers
191 views

Is there a statically typed programming language that implements Polymorphism without using a superclass or an interface?

Is there a statically typed programming language that implements Polymorphism without using a superclass or an interface (if such implementation is even possible)?
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2answers
385 views

Terminology: Classes that contain only methods [closed]

I am studying the programming language Kotlin, and I just came across the idea of a Data Class. I have a background in Java programming where classes can have fields and methods. I have heard ...
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1answer
118 views

How to deal with metaclasses in strong-typed language : is it ok to mix classes and metaclasses?

I'm working on a programming language design ans I'm struggling with how I should type the concept of Class. Let me show you some code to illustrate my problem : class MyClass { } function ...
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1answer
547 views

Why List<T>.Enumerator is struct?

During my investigations of List<T> enumeration I noticed List<T>.Enumerator is struct. In opposite for instance to System.Array.SZArrayEnumerator or System.SZArrayHelper....
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1answer
64 views

How do I find out all modifications made by installing software? [closed]

So I want to find out how to get a list of all modifications made by installing a piece of software. For example. If I install Word, I want to see all directories created, classes registered, dlls, ...
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3answers
713 views

Accessing one class variable from another class in C++

Suppose I'm in some function of class A, in this function I define an object of class B, say b, and call some function using b.func() which updates some values and arrays, say x and A. Then, I create ...
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2answers
104 views

Do I name classes based on the object type they represent or the responsibility they have?

The more I read about the Single Responsibility Principle the less I see a class as an object type, but rather as a servant that does something. For example, let us suppose we have a new requirement ...
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1answer
76 views

Inheritance but with two different shared traits?

I am facing a dilemma with designing an api gateway. Currently, I am using the pipeline pattern, with different stages being the requests made to various services, (http, sockets, amqp, ...). I have ...
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1answer
572 views

Why would you make a struct without typedef?

Since I cut my teeth on code with OO, I’m biased toward using structs as classes without methods. However, there’s probably a good reason that typedef isn’t the default behavior of struct. What is it?
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3answers
374 views

Struct or class for wrapping an int when 0 isn't a valid value

I have a business object which is basically a wrapper around a value of type int. There are some constraints for the value/object: Not every value in int's range is valid1 The valid values are not a ...
0
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1answer
146 views

Responsibility-driven design

I am quite confused about the responsibility-driven design concept. Mainly because of ever so slightly changing definitions depending on the source. Quoting BlueJ (the book I am learning that teaches ...
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4answers
347 views

Is judicious & plausible selection of class fields a valid refactoring step?

I'm a great fan of refactoring but I've been wondering about the issues raised by refactoring. Fowler advises refactoring to make code readable to all users to make the code structure more sensible, ...
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9answers
9k views

In OOP, isn't the 'protected' keyword required?

Some modern languages (e.g. Swift, Dart) do not support the protected access modifier keyword. Swift is a protocol-oriented language, but I've heard that Dart is a completely object-oriented language. ...
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2answers
113 views

C# Static & Constructor Logic [closed]

I learn C# and try to understand the logic between static and Constructor right now. One thing I need ask you about an example which I will give at below. (please ignore the quality of code or how ...
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1answer
468 views

UML class diagrams - how do I draw a class diagram that shows a self-reference? [closed]

So I have the following case. I have an interface A and an implementation AImpl. Now I have another implementation of A, called A2Impl, which references any instance of A besides implementing A ...
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1answer
842 views

Class structure: How should a binary tree and it's node class be implemented in Java in terms of class files?

In implementing a binary tree in Java, should the node class be a separate class file independent of the BinaryTreeclass, or should it be a default class in the same class file as the BinaryTree class?...
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4answers
151 views

Should supporting algorithms be in their own class?

My Widget class has a method called loadWidget. This method needs to shuffle an array to work properly, among other things. In Widget, I could implement a Fisher-Yates shuffle as its own static method ...
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2answers
254 views

2 way multiplicity constraints in code

my goal is to convert this class diagram into Java code. How should I approach this, given that I want the constraints to hold at all times? It creates a chicken-egg problem where the first Course or ...
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2answers
199 views

How to organize my test functions? (Part II: Keepin' it classy)

What are the best practices to organize your unit tests in classes? I see different possibilities: 1) One would be to write one "container" class for each function you want test and then ...
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2answers
104 views

Where should the logic concerning a class's behavior reside? In the class itself or in the calling subroutine?

I have a car object. The car cannot be driven unless it is turned on. When should I check to see if the car is on before I try to drive it? In the main program? class Program { static void Main(...
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2answers
393 views

Why are classes named “class”? [closed]

Could it also have made sense to call it a "Form", as in the Platonic sense of the ideal form that represents the thing which earthly objects strive to emulate?
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2answers
205 views

Which option is good in terms of software design?

I have one request interface IRequest and two classes ClientAddress and ClientOrder are implementing it. The same design is followed for Response with inteface IResponse and classes ...
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3answers
287 views

Java - OO - Understanding Subclass of Class Object

While a fundamental concept, I don't understand the statement "every CLASS in Java is a subclass of the class object," which is often quoted in JAVA tutorials usually in the inheritance section. I ...
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1answer
478 views

How many test-cases need to be created at least (valid and invalid equivalence class)?

Assume there is any program that is supposed to be tested and you like to perform an equivalence class analysis on it. Let's say you identified six valid and four invalid equivalence classes. Then, ...
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2answers
595 views

What are the advantages of proxy classes?

I've been learning about proxy classes in c++. I really don't see the advantages of using proxy classes, as they're not any better at concealing information than private members are. What advantages ...
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1answer
288 views

Inheritance of Constructors from parent into child class [closed]

Is the Default Constructor of Super or Parent class Can be Inherited into Child class ?
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3answers
1k views

Factory pattern or builder pattern ? which one is suited for reading Finite Element Model data from a text file?

A follow up to another question (Making a design decision about reading model data from an input file). I wish to ask another question regarding builder or factory pattern. (I read that builder is ...
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1answer
124 views

Making a design decision about reading model data from an input file

I am writing a finite element software in C++ and Qt. I want to load the input data to the model. I have a Model class that holds the data and does the work. I have created a simple lexer and parser ...
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3answers
4k views

Multiple classes working on an object

This might be a bit of a wide question but I want to understand if it's the correct way to do it. Assume I have a couple of classes all doing operations on an object. First class takes the object, ...
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1answer
25 views

Data Sharing Levels of Privacy

I've been looking through class and friends and similar c++ arrangements to share data, and cannot find how to program levels of share. No players can know what the other players have in their gold-...
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3answers
216 views

Java, pattern to restrict field usage in subclasses to after calling specific method

I want to extend class Base which is defined in specific API and the extend the extended again. As you can see below, draw method of intermediate class calculates variable top and I need to use it in ...
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2answers
124 views

Using new [className] without a return

I have started using the following in my automation code in instances where I'm not interested in keeping the object 'alive'and just using it as a means as a type of precondition. For example: ...
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2answers
2k views

What's the best way to handle a large multi-file class in Javascript?

I have a very large class of 59 methods and about 3000 lines of code. I know that's far larger than most people would want, but the class represents a virtual machine, and most of the methods are run ...
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4answers
620 views

Proper way to name a class which has just methods and not fields

GOAL: naming a class which has the responsibility to save data in Android database. The class structure is like this ClassName { public void saveSync(...){ /* implementation*/ } public ...
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1answer
97 views

An interface for designing Arduino code

Often I want Arduino board to control several peripherals. Writing program for all of them in one document using #define SOME_PIN 4 constructions seems pretty inconvenient to me. Especially in such a ...
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3answers
387 views

When to use Parameters and When Not to C#

I am have an application using MVVM pattern. It takes a user ID and returns a table with the user's bookmarks. I am trying to decided if it is better practice to include parameters in my model's ...
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5answers
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Use POJO or Map when there is a finite number of known keys?

I have some set of data with key-value pairs, but there is only a finite and known set of keys, all of the key should always be present on that data, and they all have the same type for the value. ...
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1answer
258 views

Does Interface Segregation Principle apply to parameters/request objects?

I have recently seen an example of what I think is a clear violation of ISP, but my colleague argued it is easier to use. This is what happened: We had Options class that had 2 fields sent as a ...
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1answer
241 views

What to name my config classes

What name should I give classes which are just for configuration? For example, when using JAX-RS, every application is required to have an Application class which extends the superclass javax.ws.rs....
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1answer
103 views

Ext JS: Designing a base class and override it

I'm trying to define a base class and override it's items on different inherited sub-classes. I'm following MVVM pattern to fetch records from backend. Created several stores and formulas within ...
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1answer
379 views

Should every method in a class be defined in an implemented interface?

I can see how interfaces are very useful to force different classes to have the same functionality. But there are also actions that are bound to a specific class (like updating an unique variable ...
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1answer
65 views

PHP User, Customer, Business Relationship

I am creating an invoice management system that has a User Class that handles the login system. Currently each User is associated with a Customer and the Customer class handles obtaining Monthly ...

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