What components and multithreading mechanisms have you used in your projects?

In Java projects, I used several core components and mechanisms for multithreading:

• Thread class for creating and starting threads.
• Runnable interface for defining tasks executed in threads.
• ExecutorService and thread pools to manage the number of concurrently running threads and simplify their reuse.
• Synchronization using the synchronized keyword to protect shared resources from concurrent access.
• Classes from java.util.concurrent, such as CountDownLatch, Semaphore, ConcurrentHashMap for solving synchronization problems and ensuring thread safety.

Example of using ExecutorService:

ExecutorService executor = Executors.newFixedThreadPool(3);
executor.submit(() -> {
    System.out.println("Executing a task in a separate thread");
});
executor.shutdown();