java Callable FutureTask Excecuter：如何收听完成的任务

Executer

Runnable

done()

done()

get()

Runnable

run

Executor executor =
final Runnable runnable = 
executor.execute(new Runnable() {
    public void run() {
         runnable.run();
         // do something after the run() has finished.
    }
 });

Runnable

Callable

final ListenableFutureTask<?> task = new ListenableFutureTask<Object>(
    runnable, null);
executor.submit(task);
task.addListener(new Runnable() {
  public void run() {
    // do whatever
  }
}, listenerExecutor);