How do I create a thread pool in Java?

How do I create a thread pool in Java?

To create a thread pool in Java, you can use the ExecutorService interface. Here's a simple example using Executors.newFixedThreadPool(int nThreads).

Can you show me a code example?

Sure! Here's a basic example:

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

public class ThreadPoolExample {
    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?

If you don't shut down the executor, the application may not terminate properly because the threads in the pool will keep running, preventing the JVM from exiting.

Are there different types of thread pools?

Yes, Java provides several types of thread pools, such as fixed thread pools, cached thread pools, and scheduled thread pools, each serving different use cases.