Executors.newFixedThreadPool 线程执行代码

Sure! Here's an example of how you can use `Executors.newFixedThreadPool` to execute code using a fixed number of threads:

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

public class ThreadPoolExample {
    public static void main(String[] args) {
        // Create a fixed thread pool with 5 threads
        ExecutorService executor = Executors.newFixedThreadPool(5);

        // Submit tasks for execution
        for (int i = 0; i < 10; i++) {
            final int taskId = i;
            executor.submit(() -> {
                System.out.println("Task " + taskId + " executed by " + Thread.currentThread().getName());
            });
        }

        // Shutdown the executor
        executor.shutdown();
    }
}

In this example, we create a fixed thread pool with 5 threads using `Executors.newFixedThreadPool(5)`. We then submit 10 tasks for execution using the `executor.submit()` method. Each task is a lambda expression that prints a message indicating the task ID and the name of the thread that executes it. Finally, we shut down the executor using `executor.shutdown()` to gracefully terminate the threads once all tasks have completed.

Please note that this is a simplified example, and in a real-world scenario, you would typically handle the returned `Future` objects from the `submit()` method to track task completion or obtain results.