code: public java.util.List<String> getUserGroups() {
          if (userGroups == null) {
              userGroups = new com.amazonaws.internal.SdkInternalList<String>();
          }
          return userGroups;
      }
docs: <p>
  The user groups. This parameter can be used only when the <code>Attribute</code> parameter is
  <code>launchPermission</code>.
  </p>
  
  @return The user groups. This parameter can be used only when the <code>Attribute</code> parameter is
  <code>launchPermission</code>.