Practice: Concurrency & JVM Drill
50 min · Advanced
This drill mixes the whole module the way a technical round does: quick definitions, a buggy snippet to fix, a producer-consumer to write, and a "draw the memory" question. Answer each aloud first, then check.
Topics in this lesson
- Round 1: rapid-fire concurrency and JVM questions
- Round 2: fix three buggy concurrent snippets
- Round 3: producer-consumer with BlockingQueue
- Round 4: explain the memory diagram for a program
Interview questions this lesson answers
- One line: what is a race condition?
- One line: start() vs run()?
- One line: sleep() vs wait()?
- One line: synchronized vs volatile?
- One line: what is a deadlock and the usual fix?
- One line: Runnable vs Callable?
- One line: what does Future.get() throw if the task failed?
- One line: shutdown() vs shutdownNow()?
- One line: why use ConcurrentHashMap instead of Hashtable?
- One line: what is CAS?
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