My application class constructor instantiates a JPanel extended class
which does a complex drawing at the initial showing. In the last part
of the same constructor I call a screen capture method that uses java.awt
Robot and javax.imageio to get a JPEG file of the drawing panel. The
problem is that unless I put a Thread.sleep() for two or three second
delay before the capture call, captured JPEG is sheer blank. If I could
use a while loop for waiting the completion of the drawing and the
layout in the container, what could be the conditional expression to
be written in the while clause?

Thanks in advance for all the Java GUI gurus.