🚀 go-pugleaf

I am having such difficulties with JBuilder and I would appreciate any help
greatly.  I am attempting to design an applet which is like the game Memory.
You have "cards" (which are images that I place in ImageControls) that are
initially face down, and you click on them to "flip them up" and try and
match pairs.  If you select an incorrect match, the cards flip back down,
blah blah...

My problems:

Based on my experimentation, when I try to create an event for an
ImageControl, it does not work.  The code I place in the event does not
function.  As a simplistic test, I want the image to change when I click on
it.  When I set up my code in the ImageControl event and run it (from within
the IDE) I get no change in the image.  (As an aside, I know that my code
does work because if I put the same code in a button event, I do get the
expected image change when I click my button).  If I am unable to solve this
problem, a satisfactory work around would be to add buttons for each image,
but I hate to do that if I don't have to.

My other problem is changing the images.  After two cards have been "flipped
up" I would like to wait for a certain time delay (so many seconds) and turn
them "back down" (change the image back to the default so the image are
hidden).  I have been unable to achieve this.  My attempt was to create a
thread, and when I wanted to create a "pause" before switching the image, I
would just put my thread to sleep for so many miliseconds.  In my testing,
on a button click, I changed the image, executed my sleep command, then
changed the image back to the original image.  The result I get is that
during my sleep command the ImageControl goes blank so I never see the
swapped image.  I have tried putting a shorter sleep increment and putting
this within a for loop which also calls repaint (I have tried repainting the
entire applet and the ImageControl) itself and have no success.

I am begging ... for ... HELP!  Please.  Thank you.