Tell us about multithreaded programming in Java: what did you use?

In Java, I used several approaches and tools for multithreaded programming:

• Classic threads (Thread) and the Runnable interface for simple tasks.
• ExecutorService for managing thread pools and simplifying parallel execution.
• Synchronization using the synchronized keyword and classes from java.util.concurrent.locks (e.g., ReentrantLock) to control access to shared resources.
• Collections from java.util.concurrent, such as ConcurrentHashMap and BlockingQueue, for thread-safe interaction.
• CompletableFuture for asynchronous programming and handling chains of tasks.

Example of using ExecutorService:

ExecutorService executor = Executors.newFixedThreadPool(4);
executor.submit(() -> {
    // task code
});
executor.shutdown();