What are some advanced usage patterns for ExecutorService in Java?

What are some advanced usage patterns for ExecutorService in Java?

ExecutorService in Java allows for managing a pool of threads. Advanced patterns include using CompletableFuture for asynchronous programming, scheduling tasks with ScheduledExecutorService, and implementing custom thread factories.

Can you explain how CompletableFuture works with ExecutorService?

Sure! CompletableFuture allows you to write non-blocking code. You can submit tasks to an ExecutorService and chain them using methods like thenApply, thenAccept, or handle to process results asynchronously.

What is the difference between FixedThreadPool and CachedThreadPool?

FixedThreadPool creates a fixed number of threads, reusing them for tasks, while CachedThreadPool creates new threads as needed and reuses idle threads, making it more flexible but potentially less predictable.

How can I handle exceptions in tasks submitted to ExecutorService?

You can handle exceptions by using the Future.get() method, which throws an ExecutionException if the task fails. Alternatively, you can use CompletableFuture's exceptionally method to handle exceptions in a more functional style.