Setting Up a Java Development Team Offshore: Java Interview Questions for Remote Developers

Jul 24, 2014

Java interview questionsWith over 9 million coders using Java globally, finding the right people for a Java development team should be a piece of cake. But in fact it’s not: with so many programmers claiming to be experts, you should be well prepared for the Java developer interview to be able to identify those who are really experienced and  skilled.

With an offshore Java developer, this is especially true: it’s more difficult for you to check their references, you can’t be sure what the level of technical education in their country is, but you need confidence in their skills and expertise more than ever. The only available way for you to test you offshore Java developer candidate is the questions you ask at the interview.

Here are several good Java interview questions that will help you identify and eliminate novices, and hire Java developers with a sufficient level of expertise.

  • How are an abstract class and an interface different and similar?

Why should you ask this?

The developer should know when to use an abstract class and when to use an interface. For that they need a good understanding of the differences and similarities between the two.

What do you expect to hear?

Neither interfaces nor abstract classes can be instantiated - this is the similarity. The differences are: abstract classes tend to be faster than interfaces; a class may implement several interfaces, but may extend only one abstract class; interfaces allow multiple inheritance, while a class my only extend one other class.

  • How to make Java methods virtual?

Why should you ask this?

This question is a tricky one, and for an inexperienced developer it is often confusing, so helps you identify one.

What do you expect to hear?

Java methods are automatically defined as virtual, so there is no need to make them virtual.

  • How are abstraction and encapsulation different?

Why should you ask this?

Some developers confuse the two, so a clear answer will show that the candidate understands both concepts and knows how to use each of them.

What do you expect to hear?

Encapsulation hides the data, whereas abstraction hides the implementation details and lets you focus on what the object does instead of how it does it.

  • Why is the main() function defined as static?

Why should you ask this?

Most Java programmers use this function, but not everyone knows why. A more advanced developer will understand the reason and purpose.

What do you expect to hear?

It is static so that it could be called without creating an instance. Otherwise there would be ambiguity as to which constructor should be called.

  • What does Type Erasure mean?

Why should you ask this?

Many developers are not familiar with this concept, which is an aspect of generics. By answering this question, the candidate will demonstrate more profound knowledge, understanding of generic objects and working around them.

What do you expect to hear?

This means that the runtime has no knowledge of the types of generic objects.

Sure, setting up an effective Java development team offshore is more than just conducting a Java developer interview the right way and hiring experienced developers. But these Java interview questions will help you deal with the crucially important technical aspect of the interview, as the coders’ expertise is one of the cornerstones of your future project.

Complement your team with remote Java developers.

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