Facebook Java Developer Mock Interview

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

Question 7 of 20

How is a volatile keyword used in Java?

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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 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.

William Swansen

"A volatile keyword is used in Java with variable and threads which read its value directly from its memory location. This ensures the value is read exactly as it is contained in the memory location, and that the threads or variables do not cache it in case it changes. Since Facebook is heavily dependent on the use of keywords, this concept is important to know."

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