Paint is called (by AWT) when it's time to draw the text.
// Get the current Font, and ask it for its FontMetrics.
FontMetrics fm = getFontMetrics(getFont());
// Use the FontMetrics to get the width of the String.
// Subtract this from width, divide by 2, that's our starting point.
int textX = (getSize().width - fm.stringWidth(message))/2;
if (textX<0) // If string too long, start at 0
textX = 0;
// Same as above but for the height
int textY = (getSize().height - fm.getAscent())/2 - fm.getDescent();
if (textY < 0)
textY = getSize().height - fm.getDescent() - 1;
// Now draw the text at the computed spot.
g.drawString(message, textX, textY);
