我正在尝试创建一个 ThreadPoolExecutor：
// Thingy implements Delayed and Runnable
ExecutorService executor = new ThreadPoolExecutor(1, 1, 0l, TimeUnit.SECONDS, new DelayQueue<Thingy>());
编译器说“找不到符号”：
symbol : constructor ThreadPoolExecutor(int,int,long,java.util.concurrent.TimeUnit,java.util.concurrent.DelayQueue<Thingy>)
但我不明白——DelayQueue实施BlockingQueue，所以我不应该能够使用这个构造函数 http://download.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/ThreadPoolExecutor.html#ThreadPoolExecutor%28int,%20int,%20long,%20java.util.concurrent.TimeUnit,%20java.util.concurrent.BlockingQueue%29?
这是一个泛型问题。你不能使用DelayQueue<Thingy>， 它一定要是DelayQueue<Runnable> as the ThreadPoolExecutor构造函数未声明为接受子类型的队列Runnable.
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