The new methods return the actual task that gets created from the
scheduler. They are also named such that auto-complete puts the
asynchronous methods after the normal ones. These two additions are
simply semantic.
Tasks now have a method to cancel themselves using their task id. This
is provided as a convenience.
A new class called SimpleRunnable was added. It is an abstract Runnable
such that anonymous classes may subclass it. It provides six convenience
methods for scheduling as appropriate. It also provides a cancel method
for convenience. The functionality of SimpleRunnable only stores an
integer representing the task id. A SimpleRunnable can only be scheduled
once; attempting to reschedule results in IllegalStateException.
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