How do the approaches of using ExecutorService and manual thread management with an array in Java differ?

ExecutorService is a high-level API for managing threads in Java. It allows creating a thread pool and managing their lifecycle, simplifying the execution of asynchronous tasks. Unlike manual thread management with an array, ExecutorService automatically distributes tasks among threads, reuses existing threads, and provides convenient methods for shutdown.

Manual thread management through an array requires creating, starting, and controlling each thread individually, which increases complexity and the risk of errors, such as thread leaks or improper shutdown.

Example of using ExecutorService:

ExecutorService executor = Executors.newFixedThreadPool(5);
executor.submit(() -> {
    // task
});
executor.shutdown();

Thus, ExecutorService enhances convenience, safety, and performance when working with multithreading compared to manual thread management.