design-patterns Archives - Page 5 of 7

How do the Proxy, Decorator, Adapter, and Bridge Patterns differ?

I was looking at the Proxy Pattern, and to me it seems an awful lot like the Decorator, Adapter, and Bridge patterns. Am ...

May 5, 2022
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ViewPager and fragments — what’s the right way to store fragment’s state?

Fragments seem to be very nice for separation of UI logic into some modules. But along with ViewPager its lifecycle is still misty ...

May 3, 2022
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Why create “Implicitly Unwrapped Optionals”, since that implies you know there’s a value?

Why would you create a “Implicitly Unwrapped Optional” vs creating just a regular variable or constant? If you know that it can be ...

May 3, 2022
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MVC pattern on Android

Is it possible to implement the model–view–controller pattern in Java for Android? Or is it already implemented through Activities? Or is there a ...

May 3, 2022
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Is there a simple, elegant way to define singletons? [duplicate]

This question already has answers here: Creating a singleton in Python (33 answers) Closed 3 years ago. There seem to be many ways ...

May 3, 2022
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What is the basic difference between the Factory and Abstract Factory Design Patterns? [closed]

Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so ...

May 3, 2022
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What’s an Aggregate Root?

I’m trying to get my head around how to properly use the repository pattern. The central concept of an Aggregate Root keeps coming ...

May 2, 2022
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On design patterns: When should I use the singleton?

The glorified global variable – becomes a gloried global class. Some say breaking object-oriented design. Give me scenarios, other than the good old ...

May 2, 2022
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Dependency Injection vs Factory Pattern

Most of the examples quoted for usage of Dependency Injection, we can solve using the factory pattern as well. Looks like when it ...

May 1, 2022
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What are the differences between Abstract Factory and Factory design patterns?

I know there are many posts out there about the differences between these two patterns, but there are a few things that I ...

May 1, 2022
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