[JavaBean]

You are not changing the size of the text from your JSlider. You just try to redraw the text. Try changing the size of the font as follows:

Code:

    Font font = g2.getFont().deriveFont(<modified-font-size-changed-by-jslider>);

instead of:

Code:

    Font font = g2.getFont().deriveFont(20f);

You can just have a mapping between JSlider position and font size. Based on the position of JSlider, you can assign a new font size. It should work in that case.