Name
Timer
Synopsis
A class that allows code to be scheduled for execution in the future. A
Timer
creates a dedicated thread which it uses to execute
code in one or more TimerTask
objects. These objects
are passed to it using its schedule()
and
scheduleAtFixedRate()
methods.
To schedule a task to be run once, use one of the two-argument variants of
schedule()
, passing it either the delay in milliseconds
until its only execution, or a Date
object holding the
required execution time.
The three-argument schedule()
methods arrange for the
task to be run at a given initial time, or after an initial delay and
then subsequently executed with a fixed delay between the
start times. If task execution is delayed for any
reason, the next execution of the same task will also be delayed.
Over time, these delays can increase, so this mode of operation is
acceptable when the total number of times that the task is run in a given
period is not critical (e.g., polling a mail server for undelivered mail).
When it is important that tasks be executed with a given average frequency,
such as graphics animation, the scheduleAtFixedRate()
method should be used instead. This method does not schedule each execution relative to the start time of the previous one. Instead, it attempts to compensate for delays by scheduling the task more often in order to maintain the desired long-term execution frequency. This might mean that the task will occasionally run more often than an identical task scheduled using ...
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