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14: ♦ Singleton design pattern in Java & 5 key follow up Interview Q&As

When you are asked in job interviews to explain a design pattern that you had used, many pick “singleton” as it is easy to explain. But, “singleton” design pattern does have lots of nuances that can lead to further drill down questions mentioned in this post. This post also explains…...

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Proxy design pattern in Java with service retry example

Design pattern: If you are asked to describe or talk about a design pattern, you could mention this dynamic proxy class as a proxy design pattern. Many pick either singleton or factory design pattern. It would be nicer to pick something other than these two common patterns. Some interviewers specifically…...

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♦ Why do Proxy, Decorator, Adapter, Bridge, and Facade design patterns look very similar? What are the differences?

There are often patterns that look very similar, but differ in their intent. Most patterns use polymorphism with interface inheritance. Strategy and state design patterns are very similar as well. Proxy, Decorator, Adapter, and Bridge are all variations on “wrapping” a class. Facade design pattern is a container for the…...

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Posted in Differences Between X & Y, GoF Patterns, member-paid

Java ExecutorService with strategy design pattern to execute concurrently & sequentially

Java executor framework for running multi-threaded applications concurrently, sequentially, and with a strategy design pattern to switch between sequential and concurrent execution. 1. Running concurrently

The output will be

You can see more than 1 thread process 5 tasks concurrently. Try changing the Executors.newCachedThreadPool () to Executors.newFixedThreadPool(3) for…...

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Posted in GoF Patterns, member-paid, Multithreading

06: ♦ MVC0, MVC1, MVC2, MVP, MVVM, and MVW web design patterns Java examples

Q1. What’s wrong with Servlets? What is a JSP? What is it used for? What do you know about model 0 (aka MVC0), model 1 (aka MVC1) and model 2 (aka MVC2) patterns? In “model 2” architecture, if you set a request attribute in your JSP, would you be able…...

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Posted in FAQs JEE, JEE Patterns, member-paid, Web basics
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♥♦ Flyweight design pattern to improve memory usage & performance

Flyweight pattern is about sharing a collection of objects. The flyweight design pattern is a structural pattern used to improve memory usage and performance (i.e. due to shorter and less frequent garbage collections) by creating fewer objects. Instead of creating a large number of objects, we reuse the objects that

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Posted in GoF Patterns

Builder pattern and immutability in Java

Next time you are asked to explain a design pattern in an interview, you could pick this as opposed to the very common factory and singleton design patterns. Q1. How will you go about using a builder design pattern instead of constructors to create thread-safe immutable objects? A1. Immutable objects…...

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4 JEE Design Patterns Interview Q&As

Unlike J2EE, Java EE 6 consists of annotated classes without any dependencies on the platform. This approach eliminates the need to separate business logic from the infrastructure and makes the majority of J2EE patterns and best practices superfluous. The following J2EE design patterns can be obsolete: — Service Locator (Use…...

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Posted in FAQs Java Key Areas, JEE Patterns, member-paid
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