Concurrent programming has always been a difficult task. It is a source of many hard-to-solve problems. In this chapter, we will show you different ways to incorporate concurrency and some best practices, such as immutability, which helps to create multithreaded processing. We will also discuss the implementation of some commonly used patterns, such as divide and- conquer and publish-subscribe, using the constructs provided by Java. We will cover the following recipes:
- Using the basic element of concurrency—thread
- Different synchronization approaches
- Immutability as a means of achieving concurrency
- Using concurrent collections
- Using the executor service to execute async tasks
- Using fork/join to implement divide-and-conquer
- Using flow to implement the publish-subscribe pattern
