Figure $2\mathrm{.}0$ TaskProgress graphical user interface

Long running tasks should not be run on the javafx application thread as they render the user

interface unresponsive for the duration of the task. For this reason, long running tasks are run in a

background thread. The long running task for this application is a contrived task consisting of a

loop with $10$ million iterations.

$($a$)$ Create a graphical user interface similar to the one shown in the picture $($Figure $2\mathrm{.}0).$ The

progress bar's initial position should be zero. Add the import for concurrency support of a

one$-$time task.

$(10$ marks$)$

$($b$)$ On clicking the 'Start Task' button, the progress bar should give a running indication of

progress. Override Task's call$()$ method to implement the task whose progress is to be

displayed. Bind the progress of the progress bar to the progress of the task. A for$()$ loop with

$10$ million iterations will be a suitable amount of work for the task. With this number of

iterations there is no need to sleep the background thread. During the loop, remember to

check for cancellation as well as updating the progress indication.

$(20$ marks$)$

$($c$)$ On clicking the 'Cancel Task' button, the task should be cancelled. The progress bar should

then show progress of zero.