Java Multithreading

Unveiling the mysteries of multithreading in Java. The ultimate Java multithreading course
  • Lectures 16
  • Video 3 Hours
  • Skill level all level
  • Languages English
  • Includes Lifetime access
    30 day money back guarantee!
    Available on iOS and Android
    Certificate of Completion

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Course Description

Discover how to write effective multi-threaded code in Java; learn why problems can occur with Java multithreading and how to fix those problems.

What are the requirements?

  • Some knowledge of Java

What am I going to get from this course?

  • Over 16 lectures and 3 hours of content!
  • Understand Java multi-threading
  • Be able to write effective muli-threaded code

What is the target audience?

  • Java developers
  • Java beginners who don't mind a steep learning curve

What you get with this course?

Not for you? No problem.
30 day money back guarantee

Forever yours.
Lifetime access

Learn on the go.
Desktop, iOS and Android

Get rewarded.
Certificate of completion


Section 1: My First Section

In this tutorial we'll look at the two main ways to start a thread in Java. If you want to start lots of threads all at once you'll want to use thread pools, which we'll look at in a future tutorial; the methods in this tutorial are most suitable for starting one or a small number of threads. In case you're going for a job interview or taking an exam, this is a classic interview/exam question!


This video looks at basic thread communication in Java using boolean flags with the volatile keyword. I also take a look at why volatile isn't good enough for most situations.


The basics of using the synchronized keyword in Java to stop threads messing up each other's work. What's an intrinsic lock, and why do we need it? 


How to speed up your multithreaded code by locking only those sections of code that you need to, rather than using synchronized methods and locking your whole object. Don't forget to maximize to fullscreen so you can see the code. You can also find the code on


How to use thread pools to manage lots of threads to complete lots of similar tasks. Source code available on


How to use the fantastic CountDownLatch class in Java to simplify your multithreaded code.


A tutorial on how to implement the producer-consumer pattern in Java using the ArrayBlockingQueue Java class. Producer-Consumer is the situation where one or more threads are producing data items and adding them to a shared data store of some kind while one or more other threads process those items, removing them from the data store.


A tutorial on wait and notify; low-level thread synchronization methods in Java that allow you to avoid having vile process-consuming polling loops in your code. Code on Wait and notify allow you to have sleeping threads that are woken up by other threads. "Why, exactly what I've been looking for!" I hear you say. Yes, even people who don't program in Java can enjoy using these fantastic methods. OK, maybe that's going a bit far.


A tutorial on how to implement the producer-consumer pattern in Java using the "low level" keywords wait, notify and synchronize. (See tutorial 7 for the high level version). Code on


How to use the ReentrantLock class in Java as an alternative to synchronized code blocks. ReentrantLocks let you do all the stuff that you can do with synchronized, wait and notify, plus some more stuff besides that may come in handy from time to time.


The causes of deadlock and two things you can do about it. This video also covers how to write a method that can safely acquire any number of locks in any order without causing deadlock, using the tryLock() method of ReentrantLock.

How to use Semaphores in multi-threaded Java code. Semaphores allow you to control how many threads can access a resource simultaneously; you can also use them as locks if the mood takes you, with the advantage that you can release (unlock) them from threads other than where you locked them.
Callable and Future
Finally it's time to figure out what those pesky InterruptedExceptions are for.
Multithreading in Swing (GUI) programs presents a few unique difficulties, since you can't (or at least you're not supposed to) update the GUI from another thread. The SwingWorker class can help you out a lot.
Section 2: Looking for Source Code?
Source code ....

Instructor Biography

John Purcell , Software Development Trainer

After working as a software developer and contractor for over 14 years for a whole bunch of companies including CSC, Proquest, SPSS and AT&T in the UK and Netherlands, I decided to work full-time as a private software trainer. I now live in the beautiful city of Budapest, Hungary, from where I run the website Cave of Programming.

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    • Dima Pashkov

    It's awesome. Best java multithreading tutorial ever!

    • James Raynard

    Another quality course from this lecturer

    I started a different course on Java multithreading but felt I was not fully grasping the material. I had already done a few of John's courses but was not aware he had one on multithreading, so naturally I signed up. It turned out there were some important points the other lecturer had either missed out or not explained fully (though in fairness I think the multithreading element of that course was meant to be revision rather than a complete introduction for new students). Anyway, this course is up to John's usual standards, with clear, through explanations and the understanding that only comes from a seasoned professional. Recommended for anyone with a knowledge of core Java (including anonymous classes) who wants to learn multithreading.

    • Vadim Dzyuban

    Very nice and helpful tutorial !

    Thanks a lot John for your lessons !

    • Manoj Batra

    Java Multithreading Review

    The tutorials were of great help. One improvement will be add some small exercises or mini projects where learner can try out coding.

    • santosh kokre


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