A Swing timer (an instance of javax.swing.Timer) fires one or more action events after a specified delay. Do not confuse Swing timers with the general-purpose timer facility in the java.util package. This page describes only Swing timers.
In general, we recommend using Swing timers rather than general-purpose timers for GUI-related tasks because Swing timers all share the same, pre-existing timer thread and the GUI-related task automatically executes on the event-dispatch thread. However, you might use a general-purpose timer if you don't plan on touching the GUI from the timer, or need to perform lengthy processing.
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Swing timers are very easy to use. When you create the timer, you specify an action listener to be notified when the timer "goes off". The actionPerformed method in this listener should contain the code for whatever task you need to be performed. When you create the timer, you also specify the number of milliseconds between timer firings. If you want the timer to go off only once, you can invoke setRepeats(false) on the timer. To start the timer, call its start method. To suspend it, call stop.
Note that the Swing timer's task is performed in the event dispatch thread. This means that the task can safely manipulate components, but it also means that the task should execute quickly. If the task might take a while to execute, then consider using a SwingWorker instead of or in addition to the timer. See Concurrency in Swing for instructions about using the SwingWorker class and information on using Swing components in multi-threaded programs.
Let's look at an example of using a timer to periodically update a component. The TumbleItem applet uses a timer to update its display at regular intervals. (To see this applet running, go to How to Make Applets. This applet begins by creating and starting a timer:
The speed and pause variables represent applet parameters; as configured on the other page, these are 100 and 1900 respectively, so that the first timer event will occur in approximately 1.9 seconds, and recur every 0.1 seconds. By specifying this as the second argument to the Timer constructor, TumbleItem specifies that it is the action listener for timer events.
Until the images are loaded, worker.isDone returns false, so timer events are effectively ignored. The first part of the event handling code simply sets values that are employed in the animation control's paintComponent method: loopslot (the index of the next graphic in the animation) and off (the horizontal offset of the next graphic).
Eventually, loopslot will reach the end of the image array and start over. When this happens, the code at the end of actionPerformed restarts the timer. Doing this causes a short delay before the animation sequence begins again.
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Timers are started, as with threads, by calling their start() method. The timer can be stopped (before its action has begun) by calling the cancel() method. The interval the timer will wait before executing its action may not be exactly the same as the interval specified by the user.
A Watchdog Timer is a timer that identifies the programs that are not responding or have stopped working and alerts the necessary components if things are not automatically fixed within a given time frame.
Once done, restart the computer for the changes to come into effect. Also, the watchdog timer may be disabled from the BIOS, so you will have to check there as well, the steps for which would be different for all manufacturers and should be available on their official website.
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