Java ExecutorService.awaitTermination() is a method in the Java ExecutorService interface that blocks until all tasks have completed execution or the specified timeout is reached. It is used to manage the lifecycle of tasks submitted to an executor service. Introduced in Java 2004 with Java 5, awaitTermination() is commonly used in multi-threaded applications to ensure that all tasks are completed before shutting down the executor.

https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html