static <A extends JComponent> A setFont(final Font font, final A a) {
  if (a != null) swing { a.setFont(font); }
  ret a;
}

static <A extends JComponent> A setFont(A a, Font font) {
  ret setFont(font, a);
}

static <A extends JComponent> A setFont(final S fontID, float fontSize, final A a) {
  ret setFont(loadFont_cached(fontID, fontSize), a);
}