How to make radial progress bar(Picture)?

Question

Java

In general, there is a picture of a radial (round) progress bar. How to make the progress bar itself filled when loading (for example, files).
If anyone needs it, here is the code for the standard (my) progress bar. Ps and if possible an example.

BufferedImage img = genButton(loadbarW, loadbarH, bar);
      try
      {
        int percentw = (int)(t.procents * loadbarW / 100);
        g.drawImage(img.getSubimage(0, 0, percentw, loadbarH), loadbarX, loadbarY, null);
        g.drawImage(bar_label, (loadbarX + percentw) - (bar_label.getWidth() / 2), loadbarY - bar_label.getHeight(), null);
        g.drawString(t.procents + "%", (loadbarX + percentw) - (g.getFontMetrics().stringWidth(t.procents + "%") / 2), loadbarY - (bar_label.getHeight() / 2));
      } catch(Exception e){}

Answer 1

here is a good solution: anthonyterrien.com/knob