How have you implemented and managed multithreading in your projects?

In Java projects, I used several approaches to manage multithreading:

• Thread class and Runnable interface — for creating and starting threads.
• ExecutorService — for managing a thread pool, which allows efficient reuse of threads and control over their number.
• Synchronization — using the synchronized keyword or classes from java.util.concurrent (e.g., ReentrantLock) to prevent race conditions.
• Concurrent Collections — such as ConcurrentHashMap for thread-safe collection operations.
• Future and Callable — for obtaining results from asynchronous tasks.

Example of creating and running a task via ExecutorService:

ExecutorService executor = Executors.newFixedThreadPool(3);
executor.submit(() -> {
    // task code
    System.out.println("Execution in thread " + Thread.currentThread().getName());
});
executor.shutdown();