execute
Executes the given task sometime in the future. The task may execute in a new thread or in an existing pooled thread.
If the task cannot be submitted for execution, either because this executor has been shutdown or because its capacity has been reached, the task is handled by the current RejectedExecutionHandler.
Parameters
command
the task to execute
Throws
at discretion of RejectedExecutionHandler, if the task cannot be accepted for execution
if command is null