code: @Override
      public void fillRoundRect(int x, int y, int width, int height, 
              int arcWidth, int arcHeight) {
          setRoundRect(x, y, width, height, arcWidth, arcHeight);
          fill(this.roundRect);
      }
docs: Fills a rectangle with rounded corners using the current {@code paint}.
  
  @param x  the x-coordinate.
  @param y  the y-coordinate.
  @param width  the width.
  @param height  the height.
  @param arcWidth  the arc-width.
  @param arcHeight  the arc-height.
  
  @see #drawRoundRect(int, int, int, int, int, int)