15 Java Enum Questions for Interviews

Java Enum is an important concept for interviews, these questions will help you prepare it better

Enum was introduced in Java 5 and since then it's been very popular among Java developers and widely used in different Java applications.

Since Enum in Java is much more versatile than Enum in C or C++, it also presents lots of interesting use cases.

But, despite being so popular, many Java programmers are still not aware of the functionality provided by Enum and the subtle details of using Enum in Java code. 

I realized this fact when a couple of my readers asked me some of the questions like Can Enum implement an interface in Java or Why we can not create Enum instances outside of Enum, stating that these have been asked to them in their Java Interviews.

This motivates me to put together a list of frequently asked question in Java Enum, which not only helps to do well in Interviews but also open a new path for learning.

As I had said before, a lot of time a question in Interviews makes you take a topic more seriously than otherwise, which is not a bad thing, and given the power and facilities offered by Java Enum, I think it's high time to get a master of it.

By the way, if you are new to the Java world then I highly recommend you to go through a comprehensive Java course like The Complete Java Masterclass by Tim Buchalaka and his team to learn essential Java concepts like Enum and Generics.

This is also the most up-to-date and comprehensive course with 80+ hours of content but you can buy in just $10 on Udemy’s sales. 

By the way, if you are preparing for Java interviews, you can also checkout my books, Grokking the Java Interview and Grokking the Spring Boot, where I have shared frequently asked Java interview questions. You can also use code friends50 to get 50% discount for next few days.

15 Java Enum Interview Questions for 3 to 5 Years Experienced Developers

Here is my list of questions based on the different features and properties of Java Enum. You can use this list for preparing an Interview or simply as a FAQ of Enum.

If you are new to Java then I am sure you will learn a lot about Enum and it’s a useful feature.

Question 1. Can Enum implement an interface in Java?