Question

我正在学习ExecutorService和Callables，但是得到intelij的警告说我正在为这一行做一个未选中的作业：

Future<OrderWorker<OfferType>> future = executorService.submit(new OrderWorker<OfferType>(anOfferSet));

我不知道如何正确分配。这是代码：

ExecutorService executorService = Executors.newCachedThreadPool();
List<Future<OrderWorker<OfferType>>> futures = new ArrayList<>();
for (OfferType anOfferSet : offerSet) {
    // the next assignment is unchecked:
    Future<OrderWorker<OfferType>> future = executorService.submit(new OrderWorker<OfferType>(anOfferSet));
    futures.add(future);
}

订单工人：

public class OrderWorker<I extends OfferType> implements DataWorker {
    private Logger log = Logger.getLogger(OrderWorker.class);
    private final OfferType offer;

    public OrderWorker(I data) {
        this.offer = data;
    }

    public OfferType getOffer() {
        return offer;
    }

    @Override
    public Object call() throws Exception {
        Thread.sleep(5000);
        log.info(offer.getListingPrice().getAmount());
        return this;
    }
}

DataWorker界面：

interface DataWorker<I extends OfferType> extends Callable<I> {}

OfferType是一个简单的POJO类。

编辑

我还尝试在实现时为DataWorker提供类型：

public class OrderWorker<I extends OfferType> implements DataWorker<I>

这给出了一个错误，说OrderWorker中的call（）与Callable中的call（）冲突 - ＆gt;不兼容的返回类型

我做错了什么，以及如何检查作业？

Answer 1

您需要更改的是OrderWorker的声明和call的返回类型，如下所示：

public class OrderWorker<I extends OfferType> implements Callable<OrderWorker<I>> {
    ...
    @Override
    public OrderWorker<I> call() throws Exception {
        ...
    }
}

ExecutorService取消选中赋值

1 个答案: