![]() * example set the computer's clock back by one hour. While the program is up and running, set the system clock back, for * Note that the text of the JLabel is updated every second by A Frame will come up that shows the current time in a JLabel. Start this program running by calling its main( ) * Class used to demonstrate failure of the after the system This behavior also happens in JDK1.4beta3. Java HotSpot(TM) Client VM (build 1.3.1-b24, mixed mode) Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1-b24) Don't let the system time change to affect the timer's behavior. The Timer always fires ActionEvent as long as the predefined timeout comes I would appreciate if you could fix this problem so that Because TimerQueue has defaultĪccess modifier, I cannot extend it and hence I cannot override the above The timeToWaitvariable, that is the problem. #Java itimer update#The postExpiredTimers() method calls the System.currentTimeMillis() to update TimerQueue.java has a run() method and that calls postExpiredTimers() method. I have looked at the swing Timer.java and TimerQueue.java classes, and the We also do not expect the timerīehave different if the current system time is set forward. We dont expect the timer be delayed eventhough the current system time isĭelayed by a significant amount of time. The timer also delays its expiration time for a day. Tester changes the system time of the local host, say, delay the current system Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)Īfter a swing timer is started and before that timer is expired, a software Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-C) then the system clock is changed (let's say, it's set back 1 minute)Įxpected: task1 is fired every 30 secondsĪctual : task1 is not fired for 1 minute. a timer task is scheduled to repeat every 30 secondsįinal long PERIOD = 30 * 1000 // milliseconds This breaks if the system time is changed. Time to perform a fixed number of executions is important, such asĪ countdown timer that ticks once every second for ten seconds." "It is also appropriate for for recurring activities where the total ![]()
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