The concurrency utilities are important APIs that facilitate the concurrency implementations in the Java applications. We can create the thread pools for execution, use the explicit locking mechanism, use fork or join to distribute the required task, and utilize the concurrency in context managed in the Java Enterprise applications.

For example, creating a thread pool is simple using ExecutorService, where we define the pool size and add all the different threads to that pool; in this way, we can control the execution of all these threads according to the defined pool size.

We need to understand all the available concurrency utilities because one of the performance-improvement techniques is to implement concurrency in certain heavy-processing areas in our application. We will not dissect all these utilities here, instead we will show how to resolve some common tasks using the utilities explained in the next sections.