code: public static JMenuBar leftShift(JMenuBar self, JMenu menu) {
          self.add(menu);
          return self;
      }
docs: Overloads the left shift operator to provide an easy way to add
  menus to a menuBar.<p>
  
  @param self a JMenuBar
  @param menu a menu to be added to the menuBar.
  @return same menuBar, after the value was added to it.
  @since 1.6.4