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Questions tagged [class-design]

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

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3answers
140 views

Calling full functionality private functions from public functions

I have been programming my classes in the following mode. I create a public function that has a call to a private function that has all the logic and functionality. Something like: public class ...
2
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0answers
68 views

Is assigning a method in the constructor good practice? [closed]

Here's a class with a method that calls different functions based on a parameter set in the constructor: functions = { "arg1": f1, "arg2": f2, "arg3": f3 } class C: def __init__(self,...
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2answers
96 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(...
2
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5answers
257 views

I feel like these constants should be in a different class?

I have a static class called RenderingUtilities that houses several useful methods and constants. Some of these constants are related to the Earth as an object such as the Earth's radius. I believe ...
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1answer
119 views

Should I break functionality out into new classes?

I currently have an object that is composed from several simple objects. Each simple object is used to render a particular portion of the larger object as a whole. Think of it as building a 3D ...
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0answers
50 views

Getting into situations that requires mixin while building classes. How should I correct my class design?

I have the following classes for to solve a particular problem related to HTTP responses. Problem is for class ServerSentEventStreamResponseService I am in a situation where I need mixin because I ...
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2answers
154 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?
2
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2answers
39 views

Create a new class with minimal data VS. using original class and setting non-necessary data equal to 0 or null?

I am using Scala for my example but I believe this probably could apply anywhere. Say I am using a class somewhere in my project that reads in data from a live stream of events which monitors where a ...
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2answers
32 views

“private methods” vs method out of class in a python module

I have a module with the class Foo. Foo has three methods: The constructor(__init__()) An error handling method (_error_handler()) The method that actually does something. (run()) Then, I have a ...
2
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3answers
121 views

How to store objects with inconsistant properties

I have real-world materials that are defined by various properties, some common, some not, that I would like to map to objects in C#. For example, Concrete has properties A, B, C, and Metal has ...
14
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7answers
6k views

Is it a bad idea have make a class method that is passed class variables?

Here's what I mean: class MyClass { int arr1[100]; int arr2[100]; int len = 100; void add(int* x1, int* x2, int size) { for (int i = 0; i < size; i++) { x1[i] +...
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2answers
381 views

Class that returns multiple unrelated values, are there better way to accomplish this?

I have a "tracker" class. This class tracks objects from a given input image. But in addition to this, there is another parameter that corresponds to a value used in generating the image. The ...
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1answer
519 views

Why does the Square–Rectangle problem violate SOLID principles?

My previous question was just with class diagram and because of some comments I thought I try to find an example with a little piece of code for the diagram to see if principles correct understood? ...
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2answers
372 views

Which SOLID principles are broken by this class diagram?

I just read about all the 5 principles S,O,L,I,D and I like test it in little example if I understand them correct. Which SOLID principles are hurt by this class diagram? I think what is broken is ...
4
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4answers
305 views

Is it a good idea to put in a bunch of static functions that are related to each other in terms of scope inside a class?

The language is PHP. I have several functions that relate to each other (and sometimes use each other) that I've decided to couple under the same class. Here are my reasonings, do keep in mind that I'...
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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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2answers
388 views

Is it bad practice when an Object has to be aware of another Object

I was reading this page and came across this sentence in the accepted answer: I don't like A directly knowing about B. But that's a DIP thing not a POJO thing. What if you can't abstract out B ...
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1answer
64 views

Should I group all sound file definitions together? Or define some of them locally, if possible?

For example, suppose my application have some sound files, now I define all sound file references in a single class: public class SoundHelper{ public static Sound buttonSound=new Sound("(some url)...
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2answers
229 views

Liskov Substitution Principle

I am trying to wrap my mind around a Liskov Substitution Principle and I came across this article. SOLID Class Design: The Liskov Substitution Principle In this article, the author gives an example ...
0
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1answer
121 views

How should I separate File Parse Classes?

I want to understand different ways to object design classes. I have three different classes. Generally I am creating a file parser. The classes: CustomerData - which shows text Data Model. A File ...
4
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2answers
182 views

Verifying Parameters in Constructor or Service

I was reading on this SO page about when to check parameters when constructing an object. The accepted answer suggests throwing the exception from the constructor so that an invalid object cannot be ...
1
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3answers
356 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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1answer
45 views

Is it good practice to use data API for access cross platform

All, Question: Should I have a common data access API between various cross platform applications or keep the data access specific to the UI even though it would result in duplication? Background: ...
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2answers
95 views

Should methods be part of your persisted entities?

We are coding a small game and have a Player class. This Player class has certain properties which you would persist in a database like Id, Level, Health. We would like a Player to be able to kill ...
3
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4answers
421 views

Is Abstracting your code too much a bad use of SOLID Principles?

After an unresolved argument with a friend I decided to ask the stack overflow community. Is there something like abstracting your code too much? Which of the following is the better option. We come ...
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0answers
142 views

Compute and assign value to an attribute during class instantiation python

I am new to OOPs and don't have software engineering/computer science background. I am trying to define a class where I want to compute and assign a instance attributes under def __init__(): as ...
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6answers
994 views

Should reused exceptions types be favored over single use ones?

Let's say I have Doors that are managed by a DoorService. The DoorService is in charge of opening, closing and locking the doors that are stored on the database. public interface DoorService { ...
2
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1answer
180 views

Best methods to account for large block of variables?

The question sounds retrograde but I have about 50 variables being passed to a class. Basically an array of data I call 'filters' that is first passed to a prepFiltersMethod($filters). This prep ...
0
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1answer
150 views

Enum as part of domain - enum + extension or consolidate into one class?

I have a program where the domain is focused around programs. As part of the domain, I have a 'ProgramType', which is an enum formed mostly via a string from the database but also via a bit of logic. ...
2
votes
1answer
67 views

Should we use multiple inheritance to redefine X() and call inherited X() from each superclass?

We have 4 classes. Field ForbiddenField inherits from Field RequiredField inherits from Field ForbiquiredField : the subject of my question I would like to define a function Validate()in ...
0
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2answers
88 views

Class design : Decide between file and database for storage during runtime [closed]

Based on the demo or license version of my application, I am supposed to either save the data to a file (xml) at a specific location or a relational database. What should be my approach for this case ...
1
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4answers
929 views

What is the proper place for complex business logic

I have an object that describes a two-dimensional Graph: class Graph { var points; // Array of points } Now I need to find some complex patterns in this graph, like (but more complex): Find two ...
0
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0answers
233 views

Preferred way to implement protobuf-based classes in Python?

I'm working on a distributed application that will use protocol buffers as it's core interface definition language. While am amazed how pleasant protobufs are to work with in a networking context I'm ...
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0answers
118 views

Putting the rowmapper inside the domain class

Normally in java the RowMapper is placed in its own class. Instead, what about this design, putting the RowMapper inside each domain object, and giving all of them a consistent name: public class ...
0
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3answers
5k views

Best way to naming classes and packages in Java

Apart of the code conventions to use camelCase, PascalCase etc., are there any conventions for naming packages and classes in Java? For example, I have an mvc project and the main package is com....
1
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1answer
171 views

Limitations of using classes as interface

I am an Electrical Engineer now training and working as an embedded software developer, so I have little formal computer science and software design training. I have until a few months ago only worked ...
0
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1answer
40 views

Bill Splitter application UML Design

I just want to improve this design, share your thoughts. Q1. I have specialized Splitter class based on monetary unit as "MonetarySplitter" and "NonMonetarySplitter". Whether doing so is correct? To ...
0
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1answer
287 views

Representing Java Object Hierarchy With Nested Classes

I was working with some API which was used internally, and while looking at their code I found something like this: public class Parent { @Data public static class Child { private ...
0
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2answers
142 views

Class design - Inject data or inject repository/service to fetch data?

Let’s say for example I am developing a fictional class called WidgetMaker. If the class depends at some point on lookup data stored in a database is it better to design the class with a dependency ...
0
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1answer
464 views

Controller and API DTO Architecture and class organization in .net core with microservices

We are developing a system with coarse microservice architecture. We have an API that uses controllers and back-end logic with Entity-Framework repository, and several types of clients that use this ...
0
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1answer
199 views

Is it a good idea to load all user data on top of each file including sensitive information?

I've written a User class like this: <?php class User{ private $id; private $username; private $password; private $name; private $email; private $key; private $phone; ...
1
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1answer
98 views

How to verify that every object responsible for Itself

I wonder if I have multiple objects and how to list their responsibilities where every Object Must be Responsible for Itself for example: If I have three objects: Employee,Schedule,Shift. and ...
0
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3answers
3k views

C++ design - vector classes with different element types

I am trying to design a group of related classes. For example: one table class holds a vector of integer, and has a function returning integers from the vector another table class holds a vector of ...
27
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3answers
6k views

Optional parameters or overloaded constructors

I am implementing a DelegateCommand, and when I was about to implement the constructor(s), I came up with the following two design choices: 1: Having multiple overloaded constructors public ...
1
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1answer
515 views

Using inner classes to achieve thread-safe behavior without synchronization

I have some classes that contains both immutable (primitive & references) and mutable data, but mutability come from external writes (another process). To avoid using synchronized on every ...
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0answers
38 views

Is it bad practice to not separate the class definition and constructor into separate files? (specifically in R package development)

I am developing an R package and for some reason all of the current packages I have looked at put the class definition and class constructor in separate files. Usually a myClass--class.R file and a ...
1
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3answers
231 views

How to define sound playing function? one single function for all sounds? or each sound has its own function?

After many years, I still unable to determine the correct way to define a class/function to play sound. Suppose my app may need to play some sounds, for example: button click, error popup,... How ...
2
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1answer
89 views

Feedback on inheritance assignment

So I've got this java assignment for college and was just wondering if anyone here could give me some feedback as to what I've been thinking some of this means. I've got a .csv file with building ...
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0answers
105 views

ES6(babel): Best practice for create class

I have a Product class. When I attempt to reference this from within a method on the class, I get an error saying this is undefined. To solve this, I have to bind this to all methods. And this, for ...
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1answer
106 views

Splitting up a class

I have a Report class that is basically an interface for creating HTML reports generated via a Python template engine. The Report class currently generates the report but also has a few methods ...