如何声明Callable以执行在Java中返回void的函数？
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How to declare Callable to execute function returning void in Java?
提问by Michael
Suppose I would like to run static method fooasynchronously
假设我想foo异步运行静态方法
void foo() throws Exception {...}
Since foothrows an exception I would prefer create a Callableand invoke ExecutorService.submitwith it to get a Future.
由于foo抛出异常，我更喜欢创建一个Callable并调用ExecutorService.submit它来获取Future.
Now I wonder how to declare those Callableand Futureproperly.
Should I declare them
现在我不知道如何申报的Callable和Future正确的。我应该宣布他们吗
Callable<Void> and Future<Void>?
采纳答案by Jesper
Should I declare them
Callable<Void>andFuture<Void>?
我应该声明他们
Callable<Void>和Future<Void>？
Yes.
是的。
Voidis similar to the wrapper classes Integer, Longetc. for the primitive types int, longetc. You could say it's a wrapper class for void, even though voidis not really a type.
Void类似于包装类Integer，Long等为基本类型int，long等等。你可以说这是一个包装类void，即使void不是真正的类型。
回答by emory
I think you should declare them Callable<?>and Future<?>. Then you can implement them anyway you want including Callable<Void>and Future<Void>.
我认为你应该声明它们Callable<?>和Future<?>. 然后你可以以任何你想要的方式实现它们，包括Callable<Void>和Future<Void>。
