Multithreaded concurrent programming is an important part of Java programming, which is also the focus of the interview coverage area. Therefore, learning multithreaded concurrent programming is extremely important for Java programmers. Here are 60 of the most common Java multithreaded interview questions and answers for your reference.

  1. What’s the use of multithreading?
  2. What is the difference between thread and process?
  3. What are the ways in which AVA implements threads?
  4. What is the difference between the start() and run() thread methods?
  5. How do I terminate a thread? How do I gracefully terminate a thread?
  6. What are the states of a thread’s life cycle? How do they flow from one to the other?
  7. What is the difference between wait() and sleep() methods in a thread?
  8. What are the methods of multithreaded synchronization?
  9. What is a deadlock? How do I avoid deadlocks?
  10. How do threads communicate with each other?
  11. How does the thread get the return result?
  12. What does the Violatile keyword do?
  13. How to ensure that three new threads, T1, T2 and T3, are executed in sequence?
  14. How to control only 3 threads running at the same time?
  15. Why use thread pools?
  16. Common thread pools and how they work.
  17. What is the difference between the thread pool start thread submit() and execute() methods?
  18. What’s the difference between CyclicBarrier and CountDownLatch?
  19. What are live locks, starvation, no locks, deadlocks?
  20. What are atomicity, visibility and order?
  21. What is a daemon thread? What’s the use?
  22. How do I interrupt a thread? How can I ensure that service interruption is not affected?
  23. What happens when a thread runs with an exception?
  24. What is a reentrant lock?
  25. What are the uses of Synchronized?
  26. What does the Fork/Join framework do?
  27. What exceptions can be caused by too many threads?
  28. Talk about thread-safe and unsafe sets.
  29. What is the CAS algorithm? What are the applications in multithreading.
  30. How do I check if a thread has a lock?
  31. Jdk troubleshooting multithreading problems with what command?
  32. What does thread synchronization need to pay attention to?
  33. What are the prerequisites for using the threaded wait() method?
  34. What are the important aspects of Fork/Join framework use?
  35. How is data passed between threads?
  36. What are some ways to ensure visibility?
  37. Describe several common Lock interfaces for implementing locks.
  38. What is a ThreadLocal? What are the application scenarios?
  39. What does ReadWriteLock do?
  40. What is FutureTask?
  41. How do I wake up a blocked thread?
  42. How can immutable objects help multithreading?
  43. What does multithreaded context switching mean?
  44. What thread scheduling algorithms are used in Java?
  45. What does thread.sleep (0) do?
  46. What is the Java memory model, and which areas are shared and not shared by threads
  47. What are optimistic locks and pessimistic locks?
  48. Why should the size() method of Hashtable be synchronized?
  49. Which is better, synchronous method or synchronous block?
  50. What is a spin lock?
  51. Which is better, Runnable or Thread?
  52. What is the difference between notify and notifyAll in Java?
  53. Why wait/notify/notifyAll are not in the Thread class?
  54. Why are wait and notify called in synchronous blocks?
  55. Why should you check the wait condition in a loop?
  56. What is the difference between a heap and a stack in Java?
  57. How do you get a thread stack in Java?
  58. How do I create a thread-safe singleton pattern?
  59. What are blocking methods?
  60. What happens when the thread pool queue is full when a task is submitted?

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