ThreadPoolExecutor的PriorityBlockingQueue的cannot be cast to问题

一、异常信息：

java.lang.ClassCastException: java.util.concurrent.FutureTask cannot be cast to java.lang.Comparable        at java.util.concurrent.PriorityBlockingQueue.siftUpComparable(PriorityBlockingQueue.java:357)        at java.util.concurrent.PriorityBlockingQueue.offer(PriorityBlockingQueue.java:489)

二、代码信息

private static ExecutorService executorService = new ThreadPoolExecutor(CORE_POOL_SIZE, MAX_POOL_SIZE,        60L, TimeUnit.SECONDS, new PriorityBlockingQueue<Runnable>(1024));    executorService.execute(new Runnable() {        @Override        public void run() {            .....        }    }

三、解决方法

executorService.execute(new TestTask());class TestTask implements Comparable,Runnable{    .....}