Java Multithreading

1 Review

Teachers: John Purcell

About: 3 hours, 16 lessons, Certificate of Completion

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

Read More


More Details

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.

Curriculum

Module 1: First Module

Lesson 1: Starting Threads
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!
Lesson 2: Basic Thread Synchronization
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.
Lesson 3: The Synchronized Keyword
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?
Lesson 4: Multiple Locks; Using Synchronized Code Blocks
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.
Lesson 5: Thread Pools
How to use thread pools to manage lots of threads to complete lots of similar tasks.
Lesson 6: Countdown Latches
How to use the fantastic CountDownLatch class in Java to simplify your multithreaded code.
Lesson 7: Producer-Consumer
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.
Lesson 8: Wait and Notify
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 caveofprogramming.com. 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.
Lesson 9: A Worked Example Using Low-Level Synchronization
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).
Lesson 10: Re-entrant Locks
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.
Lesson 11: Deadlock
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.
Lesson 12: Semaphores
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.
Lesson 13: Callable and Future
Lesson 14: Interrupting Threads
Finally it's time to figure out what those pesky InterruptedExceptions are for.
Lesson 15: Multithreading in Swing with SwingWorker
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.

Module 2: Source Code

Lesson 1: Source code

Reviews (1 Review)

Ari Haverinen February 5th, 2017

What You'll Learn

  1. Understand Java multi-threading
  2. Be able to write effective muli-threaded code

Requirements

  1. Some knowledge of Java

Your Teacher

Software Development Trainer