Hey! Friends here is a new programming challenge for you. Attempt this Java multithreading quiz with the top 20 interview questions and see how you score. Multithreading is an essential subject to learn and mastering it will make you write efficient code. This Java multithreading quiz includes both theoretical and coding-related questions.
While answering the questions, you would need to run the code fragments to get to the right choice. This type of Java practice test is even more useful for readers who’ve recently started learning core Java multithreading. They can practice Java online and verify their coding and multithreading knowledge level. Just for your note, our team has picked many of these questions from the recent Java interviews held by large IT majors.
You must have observed that we always try our best to make the quizzes as fruitful as they could be. All the multithreading questions were chosen after due diligence ensuring quality and correctness. In case, you also want to evaluate yourself for basic Java knowledge then, we suggest you go through the following entry-level Java quiz first. It’ll help you strengthen your hold on the Java language.
However, we’ve recently added a complete Java multithreading tutorial. You can refer to it to groom your knowledge of threads.
Java Multithreading Quiz – 20 Questions
Answer Key with Reasoning
Here’s the reasoning table explaining each correct answer concisely:
| Q# | Correct Answer | Reasoning |
|---|---|---|
| 1 | start(); | start() initializes and starts a new thread execution. |
| 2 | i and ii | Thread(Runnable r, String name) and Thread() are valid constructors. |
| 3 | a, b, e | Methods like wait(), notify(), and clone() are all from the Object class. |
| 4 | X obj = new X(); Thread tobj = new Thread(obj); tobj.start(); | Runnable instances must be passed to Thread. |
| 5 | notify() | notify() wakes a waiting thread but does not stop execution. |
| 6 | i, ii, iv | stop() forcibly ends a threadsleep() temporarily removes a thread from runningwait() causes a thread to wait and release the monitor |
| 7 | public void run() | Runnable interface requires public void run() implementation. |
| 8 | start(); | The start() method registers and starts a new thread. |
| 9 | After notification or 2 sec | Thread resumes based on timeout or notify(). |
| 10 | new Thread(new MyRunnable()).start(); | This correctly creates and starts a thread. |
| 11 | MyThread foo | System.out.println() executes within the thread. |
| 12 | Exception at runtime | Calling start() twice results in IllegalThreadStateException. |
| 13 | Inside Thread Inside Thread | Thread runs run() normally unless overridden. |
| 14 | Execution order not guaranteed | Multiple threads may execute in any order within sync blocks. |
| 15 | Ordered x, y values | Synchronized methods execute in order, preventing race conditions. |
| 16 | A B C D (unpredictable order) | Multi-threading causes unpredictable execution order. |
| 17 | 20 times | The loop runs Hello Java 20 times. |
| 18 | 1 2 | wait() releases lock and resumes after notify(). |
| 19 | Cannot determine order | Thread scheduling makes output unpredictable. |
| 20 | 1..2.. | Direct run() call runs like a normal method, not a thread. |
Key Takeaways from Java Multithreading Quiz
We hope this Java multithreading quiz will assist you in being a better Java developer or API tester. And you’ll gain confidence in developing/testing Java applications. Next, we sincerely want to thank you for attempting this Java quiz. Consequently, we recommend you read some of our most popular Java programming posts listed below. Please go through them one by one and get hired for a Java position.
Recommended Posts
We firmly believe in spreading knowledge and listening to ideas from the readers. That’s why we always request them to leave their response in the comment box. And as always, we’ve pulled in a beautiful quote stating the value of multithreading.
Let’s listen to the famous Java Architect Brian Goetz and what he has to say for the Programmers on multithreading.
It is far easier to design a class to be thread-safe than to retrofit it for thread safety later.
Lastly, please share this amazing Java multithreading quiz with your friends and on the social media platforms of your choice.
Best,
TechBeamers
