Facebook Java Developer Mock Interview

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

Question 14 of 20

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

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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.

A common format of technical questions you will be asked during an interview with Facebook is asking you to compare two terms. The best way to respond to these types of questions is to first define the terms, and then compare the differences or similarities. You may even want to provide an example to help illustrate your answer.

William Swansen

"The differences between a user thread and a daemon thread are how they are created, and their impact on JVM. User threads are created by programmers, while daemon threads run in the background. If a user thread is present, the JVM will not shut down, and the program will continue to run. However, the presence of a daemon thread does not prevent the JVM from terminating."

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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

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

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?