If you click on folowing link a page with count down applet will be displayed. You can then open Java console, clear it and minimize it. If you return to this page before the counting is finished (count = 0) the Java console will contain message "Counting interrupted" if counting thread was successfully interrupted or the message "Interrupt not allowed" if your browser does not allow thread interrupt for security reasons. If the console does not contain any message about interrupt, thread interruption is allowed but does not work.
Count down applet

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