i created jframe few labels. need display joptionpane message "welcome user" once. if frame re-opened before rebooting windows, joptionpane should not appear, if windows rebooted, joptionpane should appear again.
how able detect whether system has been rebooted, since last time application ran?
so, @kayaman mentioned, there isn't isrebooted() method in java... can make one.
assuming working on windows platforms (you need implement separate version other oses), query system event log. stuff gets put in there reckon include event "logged in", need find way last "logged in" time , see if has changed since last time checked.
accessing event log windows specific trick, , won't in native java api, there question on how access event log java use base.
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