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♦ Multithreading interview Q&As on differences between X and Y

Q1. What is difference between ‘Executor.submit()’ and ‘Executor.execute()’ method ? A1. The difference is that execute() doesn’t return a “Future” object, so you can’t wait for the completion of the Runnable, and get any exception it throws. The submit(…) method accepts Callable<V> and returns an instance of Future<V>, which you…...

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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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01: ♦ 17 FAQ Java Collection Framework (i.e. JCF) interview Q&As on differences between X & Y

Java Collection interview questions and answers and Java String class interview Q&As are must know as you can’t write any decent Java application without these 2 APIs. This post focuses on Java Collection interview Q&As on differences between X and Y. These Q&As are discussed in more detail in the…...

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07: ♥ Java Iterable Vs Iterator differences and know how

Q1. What are the differences between Iterator<T> Vs Iterable<T>? A1. The “Iterable” was introduced to be able to use in the “foreach” loop. A class implementing the Iterable interface can be iterated over. For example, Hence, it can be used in the foreach loop The Iterable interface has one method

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Core Java Modifiers, Generics, and Annotations: differences between X and Y interview Q&A

This post is for quick brush-up. These Q&A are discussed in detailed elsewhere in posts like Java modifiers interview Q&A/a> | Java generics interview Q&A | Java annotations interview Q&A Q1. What are the differences among final, finally, and finalize? A1. final makes a variable reference not changeable, makes a…...

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Differences between Spring XML and Spring JavaConfig (@Configuration)

This is a good candidate to make it to the job interview discussions along the debate of checked Vs unchecked exceptions as the industry is split on this very topic. Some favor XML, whilst others love using the JavaConfig. Q1. What are the Pros and Cons of Spring JavaConfig Vs.…...

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