All Questions
19 questions
3votes
4answers
780views
Is it a bad practice to have an interface method to tell whether it can handle an object?
interface Resolver { boolean canResolve(SomeInput input); SomeOutput resolve(SomeInput input); } public static void main(String[] args) { List<Resolver> resolvers = ...; ...
4votes
3answers
1kviews
Passing object or using the field
I would like to know what is a more appropriate way to code in Java. Is it generally better to pass entire objects in the method's parameters or just using the fields from the class? Using the field: ...
- 163
3votes
2answers
207views
Checking the user in almost all use cases
I have a web application that has Users that belong to Companies. A User can only belong to 1 Company at a time and they can manage their own company information. I'm using java spring and I'm ...
5votes
2answers
8kviews
Design pattern for processing a huge CSV file -- Java
I am learning design patterns in Java and also working on a problem where I need to handle huge number of requests streaming into my program from a huge CSV file on the disk. Each CSV line is one ...
- 61
2votes
1answer
274views
Is it OK to deprecate methods that need to be public due to the packaging model but are not to be used outside the codebase in Java?
I am currently working on a semi-large project that has several packages. There are 3 main packages, a "client" package, a "server" package and a "common" package. There are two jars, one for the ...
- 889
1vote
1answer
746views
Where and how to connect to external API in my service class?
In my service class I would like to connect to external API. Where and how should I do it? 1) Inject in constructor ExternalClass and assign to private property. Next in other property in constructor ...
- 13
4votes
2answers
194views
Should I write a wrapper within a manager object?
I have three classes that work together to do one function (from the perspective of the rest of my program). There is a little bit of set up between them, so, to make it easier for the rest of my ...
- 1,311
3votes
2answers
3kviews
Using MVC style, where is the best place to put SQL functionality?
I am wondering about best practices here. MVC (Model - View - Controller) patterns involve separating components of your program that model the data, manipulate those models, and display those ...
- 3,028
2votes
3answers
205views
Data duplication, can it be an unavoidable practice in this example?
Say I have different employees of type Employee stored in a list inside a class SubCase. public class SubCase{ protected ArrayList<Employee> employees; ... } SubCase represents a part ...
3votes
1answer
540views
Contract interface/class with inner classes/interfaces
Brief description of my project structure. I have some base classes like BaseView, BasePresenter ... . Also my project consists of modules, module represents one complete part of the application. ...
- 1,558
4votes
2answers
5kviews
How to delete an object when other things reference it (and not making the code full of inter-dependencies)
The situation: In my program, there are a list of cues. To call a cue at a certain time, there are objects called Triggers. Cues have many public methods that allow them, among other things, to be "...
- 1,311
4votes
3answers
4kviews
What is the preferred access modifier for instance variables of a data transfer object?
I'm creating a data transfer object and can't decide whether it would be better to just give public access to the instance variables or if there would be a purpose to using getters and setters to ...
- 2,696
3votes
2answers
2kviews
Lazy Processing of Streams
I have the following problem scenario: I have a text file and I have to read it and split it into lines. Some lines might need to be dropped (according to criteria that are not fixed). The lines that ...
- 19.8k
3votes
3answers
2kviews
Parallel Class/Interface Hierarchy with the Facade Design Pattern?
About a third of my code is wrapped inside a Facade class. Note that this isn't a "God" class, but actually represents a single thing (called a Line). Naturally, it delegates responsibilities to the ...
- 1,311
1vote
1answer
182views
Better way to organize query methods in Android?
In my Android app I have: A SQLiteHelper class that extends SQLIteOpenHelper, and takes care of things like table-creation and upgrades. A SQLiteDatasource class that performs CRUD operations on the ...
- 3,028
