Facebook Java Developer Mock Interview

To help you prepare for a Java Developer interview at Facebook, here are 20 interview questions and answer examples.

Facebook was written by and updated on March 29th, 2021. Learn more here.

Question 1 of 20

Can you define the final keyword in Java?

Next Question  

List of Facebook Java Developer Interview Questions & Answers

  1. 1.

    Can you define the final keyword in Java?

  2. 2.

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

  3. 3.

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

  4. 4.

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

  5. 5.

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

  6. 6.

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

  7. 7.

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

  8. 8.

    How is Enum used in Java?

  9. 9.

    How is a volatile keyword used in Java?

  10. 10.

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

  11. 11.

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

  12. 12.

    What is Composition, as used in Java?

  13. 13.

    Tell me about the Java Reflection API?

  14. 14.

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

  15. 15.

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

  16. 16.

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

  17. 17.

    Please define a CountDownLatch in the context of Java?

  18. 18.

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

  19. 19.

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

  20. 20.

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