What are some examples of using an executor service in Java?

What are some examples of using an executor service in Java?

Executor services in Java are used to manage and control thread execution. For example, you can use a fixed thread pool to handle multiple tasks concurrently.

Can you show me a code snippet for a fixed thread pool?

Sure! Here's a simple example:

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class FixedThreadPoolExample {
    public static void main(String[] args) {
        ExecutorService executor = Executors.newFixedThreadPool(3);
        for (int i = 0; i < 10; i++) {
            final int taskId = i;
            executor.submit(() -> {
                System.out.println("Task " + taskId + " is running.");
            });
        }
        executor.shutdown();
    }
}

What happens if I don't shut down the executor service?

If you don't shut down the executor service, it may continue to run in the background, potentially leading to resource leaks and preventing the application from terminating properly.

Are there other types of executor services I can use?

Yes, besides fixed thread pools, you can use cached thread pools, single-threaded executors, and scheduled thread pools, each serving different use cases.