Introduction: Java Multi-threading Interview Questions

Multi-threading in Java is an important topic for scaling up a Java application. Many companies are looking for a software developers proficient in Java Multi-threading.

This book contains basic to expert level Java Multi-threading interview questions that an interviewer asks. Each question is accompanied with an answer so that you can prepare for job interview in short time.
We have compiled this list after attending dozens of technical interviews in top-notch companies like- Google, Facebook, Netflix, Amazon etc.

Often, these questions and concepts are used in our daily programming work. But these are most helpful when an Interviewer is trying to test your deep knowledge of Java Multi-threading feature.

How will this book help me?

By reading this book, you do not have to spend time searching the Internet for Java Multi-threading interview questions. We have already compiled the list of the most popular and the latest Java Multi-threading Interview questions.

Are there answers in this book?

Yes, in this book each question is followed by an answer. So you can save time in interview preparation.

What is the best way of reading this book?

You have to first do a slow reading of all the questions in this book. Once you go through them in the first pass, mark the questions that you could not answer by yourself. Then, in second pass go through only the difficult questions. After going through this book 2-3 times, you will be well prepared to face a technical interview for Software Engineer position in Java Multi-threading.

What is the level of questions in this book?

This book contains questions that are good for a Associate Software engineer to a Senior Software engineer. The difficulty level of question varies in the book from a Fresher to an Experienced professional.

What are the sample questions in this book?

• What are the three different priorities that can be set on a Thread in Java?
• What are the differences between Pre-emptive Scheduling Scheduler and Time Slicing Scheduler?
• What is the purpose of join() method in Thread class?
• What is the fundamental difference between wait() and sleep() methods?
• Is it possible to call run() method instead of start() on a thread in Java?
• What is a daemon thread in Java?
• How can we make a regular thread Daemon thread in Java?
• How will you make a user thread into daemon thread if it has already started?
• Can we start a thread two times in Java?



• What is a Shutdown hook in Java?
• In what scenarios can we interrupt a thread?
• What is synchronization in Java?
• What is the purpose of Synchronized block in Java?
• In Java, is it possible to lock an object for exclusive use by a thread?
• How notify() method is different from notifyAll() method?
• What is a Deadlock situation?
• What is the meaning of concurrency?
• What is the main difference between process and thread?
• What is a process and thread in the context of Java?
• What is a Scheduler?
• What is the minimum number of Threads in a Java program?
• What are the properties of a Java thread?
• What are the different states of a Thread in Java?
• How can we prevent busy waiting in Java?
• Can we use Thread.sleep() method for real-time processing in Java?
• Can we wake up a thread that has been put to sleep by using Thread.sleep() method?
• What are the two ways to check if a Thread has been interrupted?

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