Top Selenium Java Interview Questions & Answers [For Freshers & Experienced]

In a Selenium interview, an interviewer would expect you to have a basic understanding of the framework. So, before you go in, make sure to get familiar with Selenium fundamentals and functions. 

Now without further ado, let’s get started!

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Selenium Java Interview Questions & Answers

1. Can you explain the concept of Selenium?

Selenium is a suite of tools created for automated web designing. It is composed of the following:

• Selenium Integrated Development Environment
• RC and WebDriver
• Grid

Importance of Selenium:

• Test automation is immense.
• Enables record and playback for testing web applications.
• Can run multiple scripts across various browsers.

Advantages of Selenium Testing tool:

• Multi-browser compatibility.
• Multi-language support.
• No server installation.
• Community support.
• Simple commands.
• Add- ons and Reusability.

 2. What is the run time polymorphism in Java?

In Java, runtime polymorphism occurs when a function call to the overridden method is resolved during runtime by method overriding. 

Benefits of Run time polymorphism in Java include:

• Enables the class to offer its specification to another inherited method.
• Implementation transfer from one method to another can be easily done. 
• The ability of a class to provide its own specification to another inherited method.

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3. What is the method used to convert String to char?

You can convert a string to char is by using toCharArray().

4. What is selenium 2.0?

Selenium 2.0 is a testing tool that combines WebDriver and RC into a single tool. It is a better version of the previous one. 

Features of Selenium 2.0 are:

• It is the combination of Webdriver and Selenium RC (Selenium 1).
• It is based on Object Oriented API for Document Object Model (DOM).
• Use of Android Driver and iPhone Driver for mobile automation.
• It is a well established framework that is used for supporting various browsers due to JavaScript implementation.
• Implant of Chrome, Mozilla, IE that is developed by Selenium developers.
• Supports both Selenium RC API and Selenium RC technology underneath the Webdriver API.

5. Is it possible to have a static method in the overloading method?

Yes, it is possible to have a static method in method overloading, as it depends only on the number of the data type and arguments.

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6. Do you think that a local variable is static in a class?

No, in a class, the local variable can not be static.

7. Explain OOPs in Java.

Object-Oriented Programming (OOP) in Java focuses on organising the code around different objects and interfaces. Abstraction, Inheritance, Encapsulation, Interface, and Polymorphism are the five OOP concepts in Java.

Benefits of OOPs:

• Modularity for easy troubleshooting.
• Code reuse through inheritance.
• Polymorphism through flexibility.
• Problem- solving.
• Create new data type by making class.
• Data hiding feature using encapsulation.
• Develop complex software.
• Efficient
• Effective Communication
• Higher security

8. Are multiple inheritances possible in Java?

No, Java does not allow you to extend more than one class. If you try to run multiple inheritance in Java, it will generate a compile-time error. 

9. What is Selenium RC?

Selenium RC or Selenium Remote Control is one of the most vital elements of the Selenium stack. It is a testing framework that relies on JavaScript for automation. Developers use Selenium RC to write test cases in any programming language (Ruby, PHP, Python, Perl, C++, etc.) and automate UI tests for web applications. It has two components – a client library for the user’s desired programming language and a server to launch and kill browsers.

Advantages of Selenium RC

• Supports cross browser testing.
• Complete and matured API.
• New browsers are readily supported.
• Supports data driven testing.
• Conditional operations are supported.
• Iterations are supported.
• Execution speed is more than IDE.

10. Why is Selenium popular?

Selenium is a favorite of testers and programmers because:

•  It supports multiple programming languages.
•  It is an open-source tool.
•  It has cross border compatibility.
• Regular and everyday repository development.

Selenium features

• Third- party plugins.
• In- built assertion functionality.
• Comes with multiple applications.
• Responsive web bugs.
• Third party plugins.
• Selenium IDE runs from Continuous Integration 
• Selenium IDE is now cross browser
• Visually test responsive web apps.

11. Explain the difference between Selenium 2.0 and 3.0?

Selenium 2.0 makes automated tests for web applications, whereas Selenium 3.0 is the extension of Selenium 2.0. The latter has inherent backward compatibility with better stability. Today, all major browsers, including Google, Mozilla, Apple, and Microsoft, offer their unique WebDriver implementations in Selenium 3.0.

12. What is Selenese?

Selenese is the language developers use to write Selenium commands which are pivotal for testing web applications. Selenium commands are broadly classfied into three types – actions, accessors, and assertions.

Features of Selenium IDE:

• Speed Control
• Run All
• Run
• Pause/ Resume
• Step
• Rollup

Benefits of using Selenium IDE:

• Automatically record test cases.
• Prvides flexibility to the developers.
• Operates on the basis of Selenese commands.
• Allows the set breakpoints.
• Test cases can  be reused using the run command.
• Use of multiple locators.

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13. Which WebDriver APIs are used in Selenium?

You can use the following WebDriver APIs in Selenium: 

•         Firefox Driver
•         Gecko Driver
•         Chrome Driver
•         Opera Driver
•         Internet Explorer Driver
•         iPhone Driver
•         Android Driver

14. Explain the use of Property files in Selenium.

The property file is used in Java code to store the global field database and GUI locator properties. It also maintains the project/database configuration data. All parameters in a property file are stored as string pairs in the key-value format.

Benefits of using Property files in Selenium:

• On change of information, there is no need to recompile the java class.
• Configure things that are prone to change over a period of time.
• Maintains input data in the programming.
• The data can be accessed anytime by using the key.

15. Explain flash testing.

The Flash software (now owned by Adobe) is widely used for building mobile games (for both Android and iOS), video games, movies, and more. Flash functionalities are usually tested by writing specific scripts to check if a Flash application is performing the desired actions. This is known as Flash Testing. 

16. Which operating systems support Selenium WebDriver?

The following operating system supports Selenium WebDrver:

• Linux Operating System
• Windows Operating System
• Apple Operating System

Some hacks to nail an interview

If you move in the right direction, any technical interview will be a cakewalk for you! A technical round can turn out to be difficult only if you appear unprepared or beat around the bush while answering. Interviewers will thoroughly vet you by asking you all kinds of questions to assess your domain knowledge. And your answers will decide whether or not you are fit for the role. 

Professional interviews are a wonderful opportunity for industry exposure. Usually, such interviews test your confidence and tactical skills. So, make sure to answer with diplomacy and spontaneity while also showing a strong presence of mind. 

 The above set of selenium java interview questions for freshers and experienced gives an insight into which kinds of questions would be asked during the actual interview. You may take these questions to practice and elaborate on your own understanding of these topics. 

Here are four tips that can help you get through an interview:

Background research

It is essential to read and do a background check about the company that you have applied for. This will give you a good idea of what the interviewer is going to ask. But let’s get this straight – most of the questions asked in the technical round will focus on your work domain. So, brush up on the basics and latest industry knowledge. 

Time Management

Once you are shortlisted for a particular interview, make sure you utilize your time efficiently. After the background check, you must strengthen your knowledge base, research extensively on the core and trending topics, and frame a questionnaire. Try to see if you can answer all the questions – if not, continue reading and learning. 

Correct answer with the right attitude

There is a misconception that you have to answer all the questions asked by the interviewer. Instead, the most crucial part of an interview is to keep the right attitude. So the interviewer is mainly going to judge on two aspects – knowledge and attitude. Take your time to answer. Be patient and listen to the questions carefully. If you are unable to answer a particular question, politely excuse yourself from that question. Be honest and straightforward.

Use logic 

The most important trick is to add logic to your responses. Logical explanations or reasons make your answers more credible. Moreover, it will show your skills and attitude towards a particular topic. However, try to keep things as simple and concise as is possible for you. Also Read: Interview tips to stand out

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Wrapping up

A lot of fortune 1000 organizations worldwide are inclined towards adopting and leveraging Selenium for different software development projects. Thus, the demand for skilled and qualified Selenium Testers/Developers is likely to scale up in the coming years. 

If you want to grab this opportunity and master Selenium, you should definitely check out a professional certification course such as upGrad’s the Executive PG Programme in Software Development – Specialisation in Full Stack Development. Designed for working professionals, the course covers over 500 hours of training and learning. You get to work on more than nine projects and assignments with top tools like Java, AWS, MongoDB, Spring, and React, to name a few. After completion, you will receive the IIIT-B Alumni status.