Return to front window the image changes back to the first one

I have two images loaded in sequence. After loading the second
image, I put the frame into the background. When I open the image
frame (to the front window), the first image is shown (but not the
second as expected). Why and how to show the lastest image?
Thank you.

I got the problem solved. Looks like that java keeps all the
panel objects (even if I assign a panel pointer to null, the
panel object is still in the Panel object pool); and when
the buried screen is up to the front window again, java
calls paintComponent() for all panels, and thus the first
image panel and 2nd image panel, and so on, but with
the last created image panel' paintComponent() called
first, and thus creating the illusion that the iamge is
returned to the original one and not the lastest one.
So the solution is to use an integer to label the lastest
imag panel and use if ( == latest) then draw() in
paintComponent().

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