code: public Packer setAnchorEast(final boolean how) {
          if (how == true) {
              gc.anchor = GridBagConstraints.EAST;
          } else {
              gc.anchor &= ~GridBagConstraints.EAST;
          }
          setConstraints(comp, gc);
          return this;
      }
docs: Add anchor=EAST to the constraints for the current component if how ==
  true remove it if false.