code: public static JFrame createShowAndPosition(final String title, final Container content,
              final boolean exitOnClose, final FramePositioner positioner) {
          return createShowAndPosition(title, content, exitOnClose, true, positioner);
      }
docs: Create a new resizeable frame with a panel as it's content pane and
  position the frame.
  
  @param title
  Frame title.
  @param content
  Content.
  @param exitOnClose
  Exit the program on closing the frame?
  @param positioner
  FramePositioner.
  
  @return A visible frame at the preferred position.