Do you have experience writing programs with multithreading and asynchronous operations?

Yes, I have experience developing multithreaded and asynchronous programs in Java. I used standard Java tools for working with threads, such as the Thread class, Runnable interface, as well as more modern abstractions from the java.util.concurrent package — ExecutorService, Future, CompletableFuture.

For example, for asynchronous task execution, I often use CompletableFuture, which allows writing non-blocking code with convenient handling of results and errors:

CompletableFuture.supplyAsync(() -> {
    // Long operation
    return computeResult();
}).thenAccept(result -> {
    System.out.println("Result: " + result);
});

I also used thread synchronization with synchronized, Lock, Semaphore to manage access to shared resources and prevent data races. My experience includes writing multithreaded server applications and optimizing performance through parallelism.