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A class that implements the Executor interface
is an object that executes submitted Runnable tasks. This interface
provides a way of decoupling task submission from the mechanics of how each task
will be run, including details of thread use, scheduling, etc.
An Executor object is designed to replace the standard approach to starting a
thread with its own style. If r is a Runnable
object, and e is an Executor object you
can replace
(new Thread(r)).start();
with
e.execute(r);
Here is the single method that the Executor
interface specifies:
void execute(Runnable command)
- Executes the given command at some time in the future. The command may
execute in a new thread, in a pooled thread, or in the calling thread, at
the discretion of the Executor implementation.
-
- Parameters:
command - the runnable task- Throws:
RejectedExecutionException - if this task cannot be
accepted for execution.NullPointerException - if command is null
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