I figured it out...here's the code:

For your action code:

public void actionPerformed(ActionEvent e) {
PrinterJob printJob = PrinterJob.getPrinterJob();
printJob.setPrintable(yourPanel.this);
if (printJob.printDialog()) {
try {
printJob.print();
} catch (Exception prt) {
System.err.println(prt.getMessage());
}
}
}

And include a print method in your code:

public int print(Graphics g, PageFormat pf, int pageIndex) {

if (pageIndex != 0) return NO_SUCH_PAGE;
Graphics2D g2 = (Graphics2D)g;
g2.translate(pf.getImageableX(), pf.getImageableY());
paint(g2);
return PAGE_EXISTS;
}