java - Why can't i instantiate ThreadPoolExecutor with BlockingQueue<Callable>; why only BlockingQueue<Runnable>? -

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my understanding callable added in 1.5 , runnable interface kept as-is prevent world ending. why can't instantiate threadpoolexecutor(core, max, tu, unit, new blockingqueue<callable>()) - why queue take runnable only? internally, if submit, invokeall, invokeany callables, should fine right? also, shutdownnow() return list of callables?

you can submit callables, wrapped internally runnables (actually futuretasks, implement runnable). shutdownnow() going return runnables, says on tin.

if want list of callables haven't been run, you'll need keep track of them somehow (e.g., keep list of them , make them responsible removing list when they're called.)


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