What are some examples of using the Java concurrent package?

Can you give me some examples of how to use the Java concurrent package?

Sure! The Java concurrent package provides various classes for managing threads and synchronization. For example, you can use the ExecutorService to manage a pool of threads.

How do I create a thread pool using ExecutorService?

You can create a thread pool by using Executors.newFixedThreadPool(int nThreads), where nThreads is the number of threads you want in the pool.

What about using Callable and Future?

Great question! You can submit a Callable task to the ExecutorService, which returns a Future that can be used to retrieve the result of the computation.

Can you show me a code example?

Certainly! Here's a simple example:

ExecutorService executor = Executors.newFixedThreadPool(2);
Callable<Integer> task = () -> {
    // some computation
    return 123;
};
Future<Integer> future = executor.submit(task);
Integer result = future.get(); // retrieves the result
executor.shutdown();