Maybe I'm someone boring with my questions about way of displaying and
printing content of JPanel, but you must understand that all little tests
of my application don't give the speed I need and, the other thing is, that
examples on Net shows how to display and print pictures (jpg for example)
or 2DGraphics.
       So, what is, memory and speed of displaying and printing, better:
1.
       g2d.drawRectangle(...);
       g2d.drawLine(...);
       g2d.draw...
               and so on, width: 210 mm x 6
                          height: 297 mm x 6

or

2. draw all that, saving as a jpg picture with the JAVA ADVANCED IMAGES
packages and than displaying and printing as a picture.

The content of a JPanel is a diagram which need to be continued (printing)
on a next pages, through the x-axis and the y-axis.