20 IntelliJ Interview Questions and Answers

IntelliJ is a popular Java development environment used by many companies. If you’re applying for a job that involves Java development, you’re likely to encounter questions about IntelliJ during your interview. Knowing how to answer these questions can help you impress the hiring manager and improve your chances of getting the job. In this article, we discuss the most commonly asked IntelliJ questions and provide tips on how to answer them.

IntelliJ Interview Questions and Answers

Here are 20 commonly asked IntelliJ interview questions and answers to prepare you for your interview:

1. What is IntelliJ?

IntelliJ is a Java IDE that is used for developing software. It is made by JetBrains, and it is one of the most popular Java IDEs on the market.

2. How do you install and use the IntelliJ plugin for Java development?

You can install the IntelliJ plugin for Java development by going to the IntelliJ website and downloading the plugin. Once you have installed the plugin, you can use it to develop Java applications within IntelliJ.

3. Can you explain what a template is in context with IntelliJ IDEA?

A template is a code fragment that can be inserted into a file. IntelliJ IDEA provides a set of predefined templates and enables you to create your own templates. You can use templates to create boilerplate code, e.g. a class with a main method, or to insert frequently-used code blocks.

4. Is it possible to customize templates in Intellij? If yes, then how?

Yes, it is possible to customize templates in Intellij. You can do this by going to File > Settings > Editor > File and Code Templates. From here, you can add, edit, and delete templates as you see fit.

5. How can debugging be achieved using IntelliJ?

IntelliJ provides a debugger which can be used to debug applications. The debugger can be used to step through code, set breakpoints, and examine variables.

6. In which scenarios would you choose to write your own custom refactoring code?

There are a few reasons you might choose to write your own custom refactoring code:

-You want to refactor a codebase that isn’t written in Java.
-You want to refactor a codebase that uses a lot of custom code that isn’t well-supported by IntelliJ’s built-in refactoring tools.
-You want to refactor a codebase that is particularly large or complex, and you need more control over the process than IntelliJ’s built-in tools can provide.

7. Can you explain what a live template is?

A live template is a code snippet that you can insert into your code. You can create your own live templates, or use ones that are provided by default. IntelliJ will automatically fill in variables for you as you type the live template. This can save you a lot of time when you are writing code.

8. Which file extensions are supported by IntelliJ?

IntelliJ supports a wide range of file extensions, including but not limited to: .java, .xml, .html, .css, .js, .jsp, .sql, and .properties.

9. What’s the difference between an SDK and JDK?

A JDK is a Java Development Kit and is the base package that contains everything you need to write, compile, debug, and run Java applications and applets. An SDK is a Software Development Kit and is a superset of a JDK, containing additional tools needed for developing a particular application or program.

10. What are some ways to install and configure IntelliJ on Windows machines?

There are a few ways to install IntelliJ on Windows machines. One way is to use the IntelliJ installer, which will guide you through the installation process. Another way is to use a package manager like Chocolatey, which can automate the installation process. Finally, you can also manually install IntelliJ by downloading the ZIP file from the IntelliJ website and extracting it to the desired location on your machine.

11. What’s the best way to create a project using IntelliJ?

The best way to create a project using IntelliJ is to use the New Project Wizard. This wizard will guide you through the process of creating a new project, including setting up the project structure and dependencies.

12. What do you understand about Inspections in IntelliJ?

Inspections in IntelliJ are a way to automatically check your code for potential errors, bugs, and other issues. You can configure which inspections you want to run, and you can also configure how IntelliJ should handle any issues that it finds.

13. How does IntelliJ help integrate with other tools like Git or Mercurial?

IntelliJ provides a unified interface for working with many different types of tools, including Git and Mercurial. This makes it easier to switch between different tools or to use multiple tools simultaneously. IntelliJ also provides a number of features specifically for working with Git and Mercurial, such as built-in support for creating and managing repositories.

14. Why do developers prefer using IntelliJ over Eclipse or Netbeans?

IntelliJ is a popular choice for developers because it is packed with features that make coding easier and more enjoyable. Some of these features include live editing, intelligent code completion, and a robust refactoring tool. In addition, IntelliJ is known for being more responsive and faster than Eclipse and Netbeans.

15. How can IntelliJ be configured to run unit tests written using JUnit 4?

IntelliJ can be configured to run unit tests written using JUnit 4 by opening the project structure window, selecting the “Modules” tab, and then selecting the “Dependencies” tab. From there, you can add the JUnit 4 library as a dependency.

16. What is the most efficient way of converting XML data into Java objects?

IntelliJ provides a number of different ways to convert XML data into Java objects, but the most efficient way is to use the IntelliJ IDEA tool. This tool can automatically generate the necessary Java code to convert XML data into Java objects, and it can also handle the conversion of complex data structures.

17. What are some common problems faced while using IntelliJ?

Some common problems that can be faced while using IntelliJ are: the IDE can be slow to start up; plugins can cause stability issues; and the UI can be a bit overwhelming and confusing to new users. However, overall, IntelliJ is a very powerful and popular IDE that is used by many Java developers.

18. Can you explain the process used by IntelliJ to search through code files?

IntelliJ uses a process called “indexing” to search through code files. This process involves building a database of all the symbols in your code, and then using that database to quickly find the symbols you are looking for.

19. How do you make sure that IntelliJ maintains multiple versions of a project?

By using the built-in version control features, you can easily keep track of different versions of a project and switch between them as needed. This can be especially helpful when working on large projects with many different contributors.

20. How can IntelliJ be integrated with Apache Maven?

IntelliJ can be easily integrated with Apache Maven through its built-in support for the popular build tool. In order to do this, you simply need to go to the IntelliJ settings and select “Plugins.” From there, you can search for and install the Apache Maven Integration plugin. Once the plugin is installed, you will be able to create and manage Maven projects directly from within IntelliJ.