code: public static JPanel makeHBox (Policy policy, Justification justification,
                                     Policy offAxisPolicy)
      {
          return new JPanel(new HGroupLayout(policy, offAxisPolicy,
                                             DEFAULT_GAP, justification));
      }
docs: Creates a {@link JPanel} that is configured with an {@link
  HGroupLayout} with the specified on-axis policy, justification and
  off-axis policy (default configuration otherwise).