Java 9 Concurrency Cookbook - Second Edition

Waiting for the finalization of a thread

In some situations, we will have to wait for the end of the execution of a thread (the run() method ends its execution). For example, we may have a program that will begin initializing the resources it needs before proceeding with the rest of the execution. We can run initialization tasks as threads and wait for their finalization before continuing with the rest of the program.

For this purpose, we can use the join() method of the Thread class. When we call this method using a thread object, it suspends the execution of the calling thread until the object that is called finishes its execution.

In this recipe, we will learn the use of this method with an initialization example.