code: @Override
      public TimeZone cloneAsThawed() {
          JavaTimeZone tz = (JavaTimeZone)super.cloneAsThawed();
          tz.javatz = (java.util.TimeZone)javatz.clone();
          tz.javacal = new java.util.GregorianCalendar(javatz);  // easier than synchronized javacal.clone()
          tz.isFrozen = false;
          return tz;
      }
docs: /* (non-Javadoc)
  @see android.icu.util.TimeZone#cloneAsThawed()