Object-oriented design is the process of planning a system of interacting objects for the purpose of solving a software problem.

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2answers
226 views

Is this a poltergeist or is it justified? [closed]

I've come to a point in re-design of my code where I face an imminent Poltergeist Anti-Pattern threat. A master application object has two "eye" objects. Eye objects have a "RenderHUD" function, which ...
1
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3answers
993 views

Is it considered bad practice to make a DAO call in an object's constructor?

I am trying to figure out the best design for instantiating an object which requires two separate calls to the data layer through a DAO. The object is not usable until these calls have been made ...
3
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1answer
414 views

When to declare @throws with a Scala annotation - abstract parent or concrete implementation?

In this StackOverflow question I asked about the behavior of the @throws annotation in Scala. Now that I understand how it works I want to ask about best practices with using it. Here's a repost of my ...
1
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5answers
206 views

Choosing a class abstraction when multiple viable approaches exist

I'm having trouble trying to design a class structure for some search functionality. It's quite possible that I'm approaching this incorrectly altogether, but putting that aside I'm curious how other ...
1
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0answers
169 views

What is a good way to structure my UI classes?

So, I have a program which has a swing GUI. (Java - duh!) I really, really don't think the way I'm structuring my classes now is good, so I am reorganizing from the ground up to follow best practices. ...
17
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11answers
3k views

When would you want two references to the same object?

In Java specifically, but likely in other languages as well: when would it be useful to have two references to the same object? Example: Dog a = new Dog(); Dob b = a; Is there a situation where ...
1
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1answer
349 views

Domain model for a notification system

I'm trying to build a modular notification service in a ASP.NET MVC web application. The application generates notifications and the service is responsible for delivering the notifications to the ...
0
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1answer
54 views

Modeling Associations

I am working on the design phase of a paper folding project. I have a few queries in this. Part of the problem statement says " A web can contain one or more ribbons in it. It can also contain a ...
2
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1answer
74 views

Queue of jobs in a different states and with different services around

I need to design a 'queue' of jobs (in a a very much UI oriented application) that can be run by a user and I need some other thoughts to pick optimal approach from ground up. My jobs can be in a ...
1
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2answers
148 views

Should an abstract class always abstract its methods to an interface?

I had learned sometime ago that abstract classes should always abstract their functions to an interface. So instead of having something like this - abstract class a{ public int i; public int ...
1
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0answers
37 views

Proper program design for submitting a form

I have been stuck wondering what the best solution to the problem below: I am developing a form like GUI with quite a few places for input. Currently, I am storing each UI element in an ArrayList ...
3
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2answers
213 views

Separation of concerns between objects

I have two objects which work together to provide interaction with HIDs on a machine. One object is responsible for the communication (read/write) to the HID and the other object is responsible for ...
2
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2answers
278 views

Does it make sense to use interfaces if you don't have polymorphism?

Suppose I have distinct classes that have the same behavior, which can be represented like this: public interface Behavior { void operationA(); } public class ImplementerA implements Behavior { ...
2
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1answer
1k views

Builder pattern inside interface. Bad design decision?

I am having trouble evaluating an implementation of the builder pattern I just came up with. The context is an API library, so I am trying not to expose any implementations in order to have a stable ...
2
votes
6answers
408 views

Object Design & Cohesion - Issue & potential refactoring

Abstract I have been trying to get my head around the cohesiveness of some functionality in our code base. I’ve approached this design in different ways, and lately I’m convinced that I took the ...
3
votes
3answers
568 views

Why not apply Interface Segregation Principle to “extreme”

Providing that clients would typically consume just one method, though methods would be conceptually related, why not always apply the Interface Segregation Principle to the extreme and have [many] ...
41
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9answers
4k views

Programming for future use of interfaces

I have a colleague sitting next to me who designed an interface like this: public interface IEventGetter { public List<FooType> getFooList(String fooName, Date start, Date end) ...
1
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3answers
2k views

Trying to come up with a mapping convention for C# objects

so this is C# but it could apply to any OO language where different sets of objects exist across different layers of an application. We have been trying to come up with a convention within the team ...
1
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5answers
300 views

Coupling business logic with class definitions

Perhaps it is my scripting background, but my perspective is that the purpose of an object should be to contain data. Classes are necessary in that they provide templates and standard ways to classify ...
1
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1answer
97 views

Adding new functionality to all of shelve.Shelf's subclasses in Python

In order to avoid the overhead associated with the shelve module's writeback option I'm interested in putting together a shelf class that only accepts hashable values, with hashability being a proxy ...
1
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1answer
166 views

How to structure a program into classes [closed]

So after a while of working in programming field I still haven't figured it out how exactly should programs be structured, in a large set I mean. Which I think it's also because of working in an ...
3
votes
3answers
2k views

Why shouldn't an object reference have access to a static member in C#

Context of my question: I am reading C#. Trying to understand Static keyword. I understand that when Static is applied to a member of a class, it can only be modified by the class and not the class ...
3
votes
2answers
128 views

System state design composition

Consider the following Java code: public class HumanStateImpl implements HumanState { private boolean alive; private Color skinColor; // getters and setters, other state fields ...
4
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3answers
239 views

Is it a good idea to return a default value if a field in a query cannot be found?

At the place I work we are using a SafeReader class that wraps an IDataReader. One of the 'features' is that if the field you are trying to access wasn't in the query then it just returns a default ...
0
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0answers
78 views

Reporting Logic vs Domain Logic

Should the reporting logic to extract domain data in a certain format reside in domain objects or separate reporting objects? The reporting logic needs to: select entities/data which match selection ...
4
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3answers
633 views

Functional programming strategies in imperative languages

I've been convinced for awhile now that some strategies in functional programming are better suited to a number of computations (i.e immutability of data structures). However, due to the popularity of ...
2
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1answer
315 views

How should object identification be managed?

I have a java/swing application in (hopefully good) MVC structure. Here is a overview of my model classes: One or more workers may work at one working location and one worker may work at different ...
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1answer
138 views

DDD with entities with no relations

Disclaimer: I'm not 100% sure I understand some of the practices and concepts in DDD, so this question may actually be answered by clarification of the ideas I'm working in a legacy system (written ...
1
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1answer
106 views

Should state machine with synonym states be shown explicitly?

I am new to state machine modeling and while trying to model a system, I have a question. An example will explain it better: Considering a system that does calling (probably a customized cell phone ...
0
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1answer
190 views

Technical example of modeling a domain with OOD?

Considering favoring composition over inheritance and looking at various design patterns there are multiple approaches to modeling a domain. Say you have some Entities which are very similar in some ...
0
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2answers
75 views

putting methods in base class that doesnt make sense/belong there [closed]

I've been lately thinking over design principles and patterns and a question did strike me. Let us say, I want to design a racing game. I want to design the classes for a variety of cars. each car ...
0
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1answer
309 views

Object Oriented Design of a Small Java Game

This is the problem i am dealing with. I have to make a simple game of NIM. I am learning java using a book so far i have only coded programs that deal with 2 classes. This program would have about ...
3
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1answer
177 views

Liskov substitution principle with abstract parent class

Does Liskov substitution principle apply to inheritance hierarchies where the parent is an abstract class the same way if the parent is a concrete class? The Wikipedia page list several conditions ...
3
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3answers
246 views

is it valid that a state machine can have more than one possible state for some transition?

I have a requirement for a workflow which I am trying to model as a state machine, I see that there is more than one outcome of a given transition(or activity). Is it valid for a state machine to ...
3
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3answers
270 views

How to safely copy an object?

This question is going to be a little long. Please bear with me. Something that happened in a project of mine made me think about how to safely copy objects. I'll present the situation I had and then ...
1
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1answer
244 views

Confused about implementing Single Responsibility Principle

Please bear with me if the question looks not well structured. To put you in the context of my issue: I am building an application that invoices vehicles stay duration in a parking. In addition to ...
0
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1answer
116 views

Should interface only be used for behavior and not to show logical data grouped together? [duplicate]

Should an interface only be used to specify certain behavior? Would it be wrong to use interface to group logically related data? To me it looks like we should not use interface to group logically ...
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2answers
236 views

Three variants of circular references between objects: how to choose?

I'm designing an object dependency graph of my program and one ambiguity between design variants appears from time to time. Imagine two objects having a reference to each other. Obviously, at least ...
2
votes
1answer
262 views

How to design the relation between a Game and a Player in a game?

I am currently attempting to make a Trading Card Game and I have got a whole array of features working already, yet I am stuck now at the portion where one player can attacker another player (more ...
0
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2answers
112 views

Buyer vs Seller on UML Model

I'm modeling an Online Classified System where, naturally, who sells also can buy and vice-versa. The question is: should I have two different Actors, Buyer and Seller or I could have, say, an actor ...
3
votes
1answer
93 views

Access items of a container with a pattern

I've two C++ classes with a relation: a container class which has a list of items. For example a library has got many books. The classes are the library and the book. Now from the external world I ...
2
votes
2answers
795 views

static set and non-static get method

I've the following Interface. public interface ValueInterface { long getValue(); } And the class: public class ValueCreator implements ValueInterface { private static long value = 0; ...
0
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1answer
221 views

overriding implemented base class methods

I read somewhere that the chain of inheritance breaks when you alter a behavior from derived class. What does "altering a behavior" mean here? Is overriding an already implemented method in base class ...
8
votes
3answers
770 views

How to adhere to the open-closed principle in practice

I understand the intent of the open-closed principle. It's meant to reduce the risk of breaking something that already works while modifying it, by telling you to try to extend without modifying. ...
0
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3answers
275 views

Wrapping a map with instance or static method

I have a java.util.Map<String, Object> object which different types of values in it. I don't want to cast whereever I do a get operation over this. To do this, I created different classes ...
1
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3answers
265 views

Reason to treat internal class variables and functions inside a class as “separate” entities

Note: there is a similar question that addresses my subject: Better style for member variables? ... but that question does not address "dealing with large legacy code base and comprehension of ...
7
votes
4answers
330 views

Is inheritance that adds rules bad? [duplicate]

I got into a debate on this question which distilled to if it is a good idea for a specialization of a class to add business rules. Unfortunately this point got trampled in the comments so I'm asking ...
78
votes
12answers
8k views

Why would Square inheriting from Rectangle be problematic if we override the SetWidth and SetHeight methods?

If a Square is a type of Rectangle, than why can't a Square inherit from a Rectangle? Or why is it a bad design? I have heard people say: If you made Square derive from Rectangle, then a Square ...
1
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2answers
454 views

Describe business logic with diagrams

I am currently developing a web application for my thesis.I was asked by my professor to make diagrams to describe the business logic. Since I don't have a prior experience, I am pretty confused with ...
1
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4answers
224 views

Dealing with similar objects with different method signatures

I am fairly new to OO design and have problems with the design of some software and looking for a pattern or a combination of patterns that could help me solving my problem. I have a type that has a ...