Using JProgress bar

Dear all
I am trying to you jprogress bar because on the program I am doing at the moment there are a lot of functions that take time to execute and so I thought that it would be good to use jprogress bar but I am not sure how to use it.
I looked at the progress bar demo in the java tutorial but It didn't tell me how to connect the progress bar with my program.
For an instance in my program there is an image and when you click on the "Detect Corners" button all the corners in the image are loaded in the shape of a triangle around the corner but this process takes time and I would like to add progress to show the progress but I am not sure how to do that.
Cheers

i use a quick-loading picture of lindsay lohan to distract the user while the time-intensive stuff goes on in the background.

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