Let's say I have a Task class

class Abc : Task<Foo>() {
   ...
}

and a Callable class

class Def : Task<Foo>() {
   ...
}

When I try to run the Callable and get a future Executors.newSingleThreadExecutor().submit(Def()) I get a Future<Foo>. However, when I try to run the Task Executors.newSingleThreadExecutor().submit(Abc()) I get Future<*>.

How can I get a future of the correct type using the JavaFX Task class? Or should I be doing something entirely different?

CodePudding user response：

The Task class (assuming it is this class) only implements the Runnable interface for the ExecutorService. Because the Runnable has no return type the returned Future can't have a result type. For the Callable interface the ExecutorService has a separate method that returns a future using the return type of the Callable instance.

What you could to is to create a callable instance that executes the task impelementation instead of passing the task instance to the ExecutorService