Java Multithreading MCQs with answers Page - 3

You will find multiple-choice questions (MCQs) related to #Java Multithreading here. Go through these questions to prepare effectively for your upcoming exams and interviews.

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Q. Which of these is not a valid thread state?

  • (A) Running
  • (B) Waiting
  • (C) Sleeping
  • (D) Terminated

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Q. Which class in Java provides thread pool functionality?

  • (A) ThreadGroup
  • (B) Executors
  • (C) Runnable
  • (D) Timer

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Q. Which thread state indicates that the thread has completed execution?

  • (A) Waiting
  • (B) Blocked
  • (C) Terminated
  • (D) Runnable

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Q. Which of the following is true about `synchronized` blocks?

  • (A) They can only be used on static methods
  • (B) They allow multiple threads to execute critical section simultaneously
  • (C) They prevent race conditions
  • (D) They are slower than unsynchronized blocks but offer no benefit

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Q. Which of the following can be used to schedule tasks for future execution in a background thread?

  • (A) Thread
  • (B) Timer
  • (C) Runnable
  • (D) Process

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Q. What is the result of calling `Thread.currentThread()`?

  • (A) Creates a new thread
  • (B) Stops current thread
  • (C) Returns a reference to the current thread
  • (D) Returns null

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Q. Which of the following is used to implement mutual exclusion in Java?

  • (A) volatile
  • (B) final
  • (C) synchronized
  • (D) const

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Q. What is the output if two threads call `start()` on the same thread object?

  • (A) It will run twice
  • (B) IllegalThreadStateException is thrown
  • (C) It runs once normally
  • (D) Nothing happens

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Q. Which method should you override when implementing the Runnable interface?

  • (A) execute()
  • (B) run()
  • (C) start()
  • (D) launch()

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Q. Which method in the Thread class checks whether the current thread has been interrupted?

  • (A) isAlive()
  • (B) isInterrupted()
  • (C) wasInterrupted()
  • (D) hasInterrupted()

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