Facebook Java Developer Mock Interview

Practice 20 Facebook Java Developer interview questions covering system design, scalability, and backend engineering.

Question 1 of 20

Since many Facebook applications are developed using Java. can you tell me what the key elements of the Java programming language are ?

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William Swansen has worked in the employment assistance realm since 2007. He is an author, job search strategist, and career advisor who helps individuals worldwide and in various professions to find their ideal careers.

This is the type of question an interviewer at Facebook will use to begin the conversation, learn more about your background, and collect information they can use throughout the interview. This question also provides you the opportunity to direct the interview towards a subject area that you are familiar with and comfortable responding to questions about. Throughout the interview, keep your answers brief and to the point. This will encourage the interviewer to ask follow-up questions about the same topic or move on to a new subject.

William Swansen

"There are several key features of the Java programming language. First, it is simple to learn. Next, Java is somewhat object-oriented and enables programmers to manage their code using objects. Several other key features of Java include its portability, platform independence, security, and the large library of code available to programmers."

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20Facebook Interview Questions & Answers

1.Since many Facebook applications are developed using Java. can you tell me what the key elements of the Java programming language are ?

2.Within Java, what are the differences between Path and Classpath variables?

3.Can you discuss the importance of the main() method in Java?

4.How is Enum used in Java?

Facebook Java Developer Mock Interview

Since many Facebook applications are developed using Java. can you tell me what the key elements of the Java programming language are ?

20Facebook Interview Questions & Answers

1.Since many Facebook applications are developed using Java. can you tell me what the key elements of the Java programming language are ?

2.Within Java, what are the differences between Path and Classpath variables?

3.Can you discuss the importance of the main() method in Java?

4.How is Enum used in Java?

5.In your opinion, Is Java Pass By Value or Pass By Reference?

6.Can you define the final keyword in Java?

7.How is a volatile keyword used in Java?

8.Can you discuss what a static import is and what the pitfalls of using this are?

9.Facebook developers usually write their programs using Java. Can you describe how access modifiers are used in Java?

10.What is Composition, as used in Java?

11.Tell me about the Java Reflection API?

12.What is a marker interface, and how do you use it when writing Java code for the Facebook environment?

13.Can you tell me what a Compare and Swap algorithm is and how you use it when coding in Java?

14.Can you discuss the differences between a user and a daemon thread?

15.Talk about what a Java timer class is and how you schedule a task to run after a specific interval?

16.Please define a CountDownLatch in the context of Java?

17.How does an OutOfMemoryError impact a program written in Java, and how can this be corrected?

18.When programming in Java, can you have an empty catch block?

19.Please describe the JDBC API and discuss how it is used?

20.What are some examples of JDBC drivers you would use when programming applications for Facebook?