MockQuestions

Facebook Java Developer Interview Questions

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

Tell me about the Java Reflection API?

How to Answer

As the interview progresses, the technical questions will become more difficult. This indicates that the Facebook interviewer is gaining confidence in your qualifications and is willing to explore your background in more depth. Continue to answer the questions, in the same manner, keeping your answers brief and to the point. While interviewing with Facebook for a Java Developer's position, you will be asked many questions about APIs, such as SOAP API or REST API. Make sure you review these so you'll be prepared to answer the questions.

Written by William Swansen on March 31st, 2021

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Facebook Java Developer Interview Questions & Answers

  • 1. Tell me about the Java Reflection API?

      How to Answer

      As the interview progresses, the technical questions will become more difficult. This indicates that the Facebook interviewer is gaining confidence in your qualifications and is willing to explore your background in more depth. Continue to answer the questions, in the same manner, keeping your answers brief and to the point. While interviewing with Facebook for a Java Developer's position, you will be asked many questions about APIs, such as SOAP API or REST API. Make sure you review these so you'll be prepared to answer the questions.

      Written by William Swansen on March 31st, 2021

      1st Answer Example

      "The Java Reflection API enables you to test and modify applications while they are running. You can inspect the various elements of the java programming language, seeing the details. Java developers use this to debug and improve their programming."

      Written by William Swansen on March 31st, 2021

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

      How to Answer

      This is a follow-up to a previous question. Any time you provide the Facebook interviewer with the answer, you should anticipate a follow-up question. This indicates that they either need more information or have a specific interest in this topic. If there are several follow-up questions about the same topic, they indicate that the subject is important to their operations. You should use it as a clue to talk more about the subject when answering their questions.

      Written by William Swansen on March 31st, 2021

      1st Answer Example

      "There are four basic types of JDBC drivers. The drivers work in conjunction with the JDBC API to connect with and extract information from databases. The four drivers are ODBC, Native API, Pure Java driver for Database Middleware, and Direct-to-Database Pure Java Driver. All of these are currently used in Facebook and the applications which run in the Facebook environment."

      Written by William Swansen on March 31st, 2021

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

      How to Answer

      Another classic Facebook technical interview question asking you to define a concept and then describe how it is used. Continue to keep your answers brief and to the point, and feel free to provide an example if you think it will embellish or enhance your answer. Always be prepared for follow-up questions.

      Written by William Swansen on March 31st, 2021

      1st Answer Example

      "JDBC stands for Java Database Connectivity. The API enables java programs to work with relational databases. This enables the program to connect with the database, run SQL queries, and process the results."

      Written by William Swansen on March 31st, 2021

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

      How to Answer

      This is an example of an operational question. Operational questions evaluate specific elements used in your job. Like technical questions, answers to operational questions should be brief and to the point. You should also anticipate follow-up questions if the Facebook interviewer needs additional information or wants to explore the topic in more detail.

      Written by William Swansen on March 31st, 2021

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

      How to Answer

      This is an example of a hybrid technical and operational question. While technical questions asked during an interview at Facebook you will be quizzed about specific concepts, operational questions explore how you do your job. This question first asks you to define how a specific concept impacts your program and then discuss how to remediate it. As with technical questions, hybrid or operational questions should be answered briefly and to the point.

      Written by William Swansen on March 31st, 2021

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  • 6. Please define a CountDownLatch in the context of Java?

      How to Answer

      You'll note that this question simply asks for a definition of a term used within the java programming language. You can only provide the definition or enhance your answer by describing how it is used when developing Facebook applications and providing an example. Your choice of how to respond to this question will be based on your perception of the interviewer, the interview's progress, and whether you feel providing a more in-depth answer will better demonstrate your qualifications for the job with Facebook.

      Written by William Swansen on March 31st, 2021

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

      How to Answer

      Another classically formatted technical question. You are being asked to define a concept and then discuss how it is used in your work. Remember to keep your answer brief and to the point, and provide an example if you think it will enhance your response. Always be prepared for follow-up questions when you provide an answer.

      Written by William Swansen on March 31st, 2021

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

      How to Answer

      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.

      Written by William Swansen on March 31st, 2021

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

      How to Answer

      This is a more complex technical question, which asks you to define a term and then discuss how it is used when creating a Java program. Regardless of whether a question is simple or complex, it would be best to keep your answer brief and to the point. The Facebook interviewer will either ask for more information or move on to the next topic.

      Written by William Swansen on March 31st, 2021

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

      How to Answer

      The fact that this is a technical question is obvious since it asks you to define a term and then discuss how it is used. Make sure you answer each part of the question in the order asked. This will help the interviewer follow your answer and confirm that you are listening to their questions during the interview.

      Written by William Swansen on March 31st, 2021

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

      How to Answer

      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.

      Written by William Swansen on March 31st, 2021

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  • 12. What is Composition, as used in Java?

      How to Answer

      As the interview with Facebook progresses, the hiring manager will continue to ask you technical questions about writing programs within Java. Some of these will be very simple, asking you to define basic concepts that any programmer should know. Others will be more complex and require you to give longer, more complicated answers to define the concept, describe how it is used, and give an example of how to write the code. The best way to prepare for these is the practice these types of questions, stating the answers out loud, so you become comfortable doing this.

      Written by William Swansen on March 31st, 2021

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

      How to Answer

      Technical questions asked in this fashion are requesting that you describe how a concept or process is used when programming in Java. When answering this type of question, you may want a skip defining the concept and simply state how it is used. You can still provide an example if this helps clarify your answer. Make sure to keep your answer brief and to the point. The Facebook interviewer will ask a follow-up question if they need additional information.

      Written by William Swansen on March 31st, 2021

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

      How to Answer

      This technical question asks you to first define the concept and then describe some features of its use. This is a common format for technical questions that a Facebook interviewer will ask you. When answering a question during an interview, you should anticipate follow-up questions. These indicate that the interviewer needs additional information or has a strong interest in the topic they are asking about. It may also be an indicator that the topic is important to the operations of the organization.

      Written by William Swansen on March 31st, 2021

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  • 15. How is a volatile keyword used in Java?

      How to Answer

      This technical question assumes you know the definition of the term the Facebook interviewer is asking about and only requests that you describe how it is used. By carefully listening to the interview's questions, you will provide the answer they are expecting. If you begin to think about your answer while the interviewer is still talking, you may miss the question's essence and give an answer which is not related to the question.

      Written by William Swansen on March 31st, 2021

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  • 16. Can you define the final keyword in Java?

      How to Answer

      This technical question asks you to define a concept within Java. When interviewing at Facebook or any other organizaiton, you should carefully listen to the questions you are being asked. Do not start to formulate your answer until the interviewer has completed asking the question. This will ensure that you understand what they are asking and that your answer corresponds to what they are looking for. When answering this question, the mistake you can make is providing too much information since you are only being asked to define the concept.

      Written by William Swansen on March 31st, 2021

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

      How to Answer

      You may note that this question asks you for your opinion, even though it is technical. Not all technical questions have finite answers. Some may be relevant to the work you do or the type of experience you have writing programs. It is okay to state an opinion about a topic as long as you can support your answer. When asked a question of this type during the interview with Facebook, you can anticipate follow-up questions asking why you believe this to be the right answer.

      Written by William Swansen on March 31st, 2021

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  • 18. How is Enum used in Java?

      How to Answer

      You should already recognize this as a technical question. It is asking you how a concept or process is used within the Java programming language. Continue to answer technical questions directly and briefly, with little embellishment, anticipating follow-up questions from the Facebook interviewer.

      Written by William Swansen on March 31st, 2021

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

      How to Answer

      This is another example of a technical question. As a Java developer who is interviewing with Facebook, you can anticipate that most of the questions you will be asked during an interview will be technical. The best way to prepare for these is to review the concepts used in Java programming and understand the processes, libraries, tools, and methodologies Java developers use. Being familiar with these will help you prepare for the questions you are likely to be asked.

      Written by William Swansen on March 31st, 2021

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

      How to Answer

      This is a common format of a technical question. Technical questions ask you about concepts or items related to the work you do. They sometimes ask you to compare similar concepts or to describe how they are used. When answering technical questions using this format, you should first define the terms you were asked about. You then either compare them or describe how they are used. You may provide an example relevant to the Facebook job posting if it helps illustrate your answer.

      Written by William Swansen on March 31st, 2021

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  • Facebook
    Account Manager Interview Questions

    21. What does it mean to use a consultative approach with clients?

    22. How do you build good client relationships?

    23. How would your coworkers describe you?

    24. Describe a time when you had to deal with a challenging client. How did you handle this?

    25. How knowledgeable are you about Facebook's advertising platform?

    26. Talk about a time when you helped your team execute a marketing strategy.

    27. What does customer service mean to you?

    28. If we hired you, what would you do during your first 30 days?

    29. Can you tell me how do you deal with stress?

    30. What is your ideal work environment?

    Facebook
    Internship Interview Questions

    31. What do you do to stay motivated?

    32. What research methods are you familiar with?

    33. What is your favorite Facebook group or page?

    34. What would you change about Facebook?

    35. How do you build professional relationships?

    36. How do you deal with conflict in the workplace?

    37. Can you walk me through your education and tell me how it's going to help you succeed as an intern here?

    38. Besides Facebook, what is your favorite social media platform?

    39. Where do you see yourself in 5 years?

    40. How will this internship prepare you for your career goals?

    Facebook
    Java Developer Interview Questions

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

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

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

    44. How is Enum used in Java?

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

    46. Can you define the final keyword in Java?

    47. How is a volatile keyword used in Java?

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

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

    50. What is Composition, as used in Java?

    Facebook
    Market Specialist Interview Questions

    51. What is your experience working with cross-functional teams?

    52. How do you identify "good" vs. "bad" users?

    53. How do you prioritize tasks?

    54. What if a government official asks you to remove a post ?

    55. How do you identify a FB account created by underage children?

    56. How would you rate your problem-solving abilities?

    57. Are you comfortable working with large data sets?

    58. What types of abuse cases are you familiar with?

    59. Tell me about yourself.

    60. Why are you leaving your current role?

    Facebook
    Marketing Interview Questions

    61. Describe a marketing campaign or initiative you’ve worked on from start to finish. How were you successful? How could you have done better?

    62. How well do you take criticism?

    63. If hired, what will be your contribution to our team culture?

    64. Have you ever been in a challenging team situation? What did you do to move towards a resolution?

    65. Why is Facebook the best social media platform?

    66. Describe your own personal experience on Facebook.

    67. Tell me what you know about Facebook EdgeRank? Why does it matters?

    68. What would you do in the first 30 days of working at Facebook?

    69. Describe the personality of a manager you’d never want to work for.

    70. Describe your typical workday.

    Facebook
    Product Manager Interview Questions

    71. Facebook Product Managers work with cross-functional teams of engineers, designers, data scientists, and researchers to build products. Talk about your cross-functional work experience and how it will benefit our world-class team.

    72. Facebook is hiring an entrepreneurial Product Manager who moves quickly and can help innovate and drive product initiatives. Give us an example of a time when you acted as a highly entrepreneurial PM.

    73. Facebook Product Managers lead and motivate while maintaining team health. If hired, how will you develop rapport and earn the trust of your new team?

    74. We seek candidates with at least five years of product management or related industry experience. Please take a few minutes to walk us through your resume and related experience.

    75. Facebook Product Managers should have a Bachelor of Arts or a Bachelor of Science in a relevant field. Please walk us through your education.

    76. Facebook Product Managers are expected to display strong leadership, organizational, and execution skills. How do you maintain the highest standards during project delivery?

    77. As a Product Manager, you are the primary driver for identifying significant opportunities and driving product vision, strategies, and roadmaps. Talk about your proudest time developing, implementing, or managing a new service or strategic program.

    78. As a Facebook Product Manager, you will deliver products aligned with our mission and goals. What do you know about Facebook's mission and strategic competitive position?

    79. Facebook Product Managers work to maximize efficiency in a constantly evolving environment where the process is fluid and creative solutions are the norm. Please share your favorite approach to maximizing team efficiency.

    80. Walk us through your experience going through an entire product lifecycle.

    Facebook
    Program Manager Interview Questions

    81. What type of pace do you try to set for yourself and the teams you work with?

    82. What does a successful mentoring relationship look like?

    83. What qualities of a company's culture do you appreciate the most?

    84. What qualities of a company's culture would be a red flag for you?

    85. What is your upward communication style?

    86. How can you help to facilitate "executive synthesis" as a program manager at Facebook?

    87. At Facebook, we ask that our program managers develop domain expertise. Please describe your process for obtaining the domain specific knowledge required for the role.

    88. Facebook program managers are "go-to" individuals who bridge groups together. What steps would you take to establish yourself in that role?

    89. Describe a time when the data-driven analysis you performed informed an impactful decision.

    90. Describe your experience leading enterprise operations initiatives.

    Facebook
    Recruiter Interview Questions

    91. As a Facebook Recruiter, you should have a broad understanding of human resources topics and recruitment best practices. Walk us through your related education and training, and describe how it will benefit you in this role.

    92. Facebook is looking for a Recruiter with a proven track record of building strong working relationships with leaders and influencing cross-functional partners. Do you consider yourself a persuasive person?

    93. As a Facebook Recruiter, you will know how to prioritize business needs and push back on stakeholders when appropriate. Tell us about a time when you influenced hiring practices.

    94. Facebook seeks a Recruiter experienced in partnering with hiring managers, interviewers, and team members throughout the hiring process. How do you help your current company to make sound hiring decisions?

    95. Facebook Recruiters are consultative in nature and leverage their interpersonal experience to communicate across all levels of the organization, internally and externally. In which ways do you act as a partner and consultant to your colleagues?

    96. Recruiting in the technology industry requires a broad depth of knowledge. As a Facebook Recruiter, you may be recruiting for a position with which you are unfamiliar. How do you quickly learn industry terminology for roles that are new to you?

    97. Facebook is looking for a Recruiter with experience mapping target companies, leveraging open source communities, and using creative sourcing techniques. Tell me about a time when you utilized your industry network to source exceptional talent.

    98. Facebook seeks a Recruiter with impactful and strategic diversity sourcing and recruiting experience. If hired, how will you help Facebook continue to improve its diversity recruitment plan?

    99. Facebook seeks a Recruiter with a proven interest in learning to identify and engage diverse talent. Name one creative idea you have that could enhance Facebook's diversity recruitment strategy.

    100. Facebook Recruiters must have an in-depth knowledge of full-cycle recruitment. Please walk us through your experience in full-cycle recruitment, including sourcing, screening, engaging, and closing candidates.

    Facebook
    Software Engineer Interview Questions

    101. What are some of the programming languages you are familiar with, and which ones do you prefer?

    102. If hired by Facebook, can you estimate what portion of your day will involve coding and other activities you will perform when not coding?

    103. Facebook is very proud of our products and the people who develop them. In your opinion, what distinguishes a great software engineer from an average one?

    104. What do you look for or check when reviewing another team member's code?

    105. What do you feel are the critical principles of good software engineering?

    106. Walk me through your process for designing scalable applications.

    107. Describe the process you use to create a program, from requirements definition to delivery.

    108. How do you go about addressing errors in your code?

    109. Can you describe Facebook's software development life cycle, as you understand it?

    110. Here at Facebook, we have embraced Agile methodology. How experienced are you with the Agile software development process?

    Facebook
    Technical Program Manager Interview Questions

    111. What excites you about working as a technical program manager at Facebook?

    112. Describe a time when you identified a new product, project, or program.

    113. What are the main components of a program-level technology roadmap?

    114. At Facebook, part of our mission is to uplift the world through safe and inclusive communities. How would you contribute to the development of a safe and inclusive community within the teams you work with?

    115. At Facebook, part of our mission is to help others nurture connections. How would you develop healthy connections with your stakeholders?

    116. What is Facebook Marketplace and how is it used?

    117. Describe your experience managing technology programs and leading cross-functional teams.

    118. Describe your experience with managing system analysis and design initiatives.

    119. What level of engineering experience do you have?

    120. What is the concept of scalability in a technical setting?