(#9) Tricky Java Questions for Interviews

Motto: OOP, Optional and clean code...

Q1: Let’s suppose you have an Optional object. What’s the difference between calling orElseGet and orElse on it? Can you provide a concrete situation when orElseGet is much better?

Q2: Why Java is not 100% considered an object oriented programming language?

Q3: Why in Java is recommended to have methods with maximum 10 lines of code and in C is recommended to not have too many small methods due to stack call overhead? There is no performance issue in Java when you have too many small methods?

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Java - Example of practical interview question

Hi guys,

Today, I’m going to present you a nice interview question that you can use to interview your candidate. The question is dedicated to Java programming language, but it can be easily updated to your current programming language.

26th May 2020 - Mihai Surdeanu

Java interface class

The power of using interfaces in Java

The idea behind this article is quite simple: try to use interfaces instead of concrete classes whenever is possible!

14th May 2023 - Mihai Surdeanu