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问题描述
我正在尝试创建一个ThreadPoolExecutor：
I'm trying to create a 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 实现了 BlockingQueue ，所以我不应该使用？
but I don't understand — DelayQueue implements BlockingQueue, so shouldn't I be able to use this constructor?
推荐答案
这是一个泛型问题。您不能使用 DelayQueue< Thingy> ，它必须是 DelayQueue< Runnable> 作为 ThreadPoolExecutor 构造函数未声明为接受 Runnable 子类型的队列。
This is a generics problem. You can't use DelayQueue<Thingy>, it has to be DelayQueue<Runnable> as the ThreadPoolExecutor constructor is not declared to accept queues of sub-types of Runnable.
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