ScheduledExecutorService 本身并不提供直接设置任务优先级的方法
以下是一个使用 PriorityBlockingQueue 实现的示例：
Runnable 类，其中包含一个表示优先级的字段：public class PriorityRunnable implements Runnable, Comparable<PriorityRunnable> { private int priority; private Runnable task; public PriorityRunnable(int priority, Runnable task) { this.priority = priority; this.task = task; } @Override public void run() { task.run(); } @Override public int compareTo(PriorityRunnable other) { return Integer.compare(other.priority, this.priority); }}PriorityBlockingQueue 实例，并将其传递给 ThreadPoolExecutor：import java.util.concurrent.*;public class PriorityScheduler { public static void main(String[] args) { int corePoolSize = 4; PriorityBlockingQueue<Runnable> queue = new PriorityBlockingQueue<>(); ThreadPoolExecutor executor = new ThreadPoolExecutor(corePoolSize, corePoolSize, 0L, TimeUnit.MILLISECONDS, queue); // 提交任务 executor.submit(new PriorityRunnable(1, () -> System.out.println("Task with priority 1"))); executor.submit(new PriorityRunnable(3, () -> System.out.println("Task with priority 3"))); executor.submit(new PriorityRunnable(2, () -> System.out.println("Task with priority 2"))); executor.shutdown(); }}在这个示例中，我们创建了一个具有 4 个核心线程的线程池。当提交新任务时，它们将根据优先级顺序执行。请注意，这种方法可能会导致线程饥饿，因为高优先级任务可能会持续占用线程，从而阻止低优先级任务的执行。为了避免这种情况，可以考虑使用更复杂的调度策略，例如基于时间片轮转的调度。
