src/java.base/share/classes/java/text/DateFormatSymbols.java

*** 288,297 ****
--- 288,298 ----
       * @serial
       */
      Locale locale = null;
  
      /* use serialVersionUID from JDK 1.1.4 for interoperability */
+     @java.io.Serial
      static final long serialVersionUID = -5987973545549424702L;
  
      /**
       * Returns an array of all locales for which the
       * <code>getInstance</code> methods of this class can return
*** 890,899 ****
--- 891,901 ----
       * <code>zoneStrings</code> field is initialized in order to make
       * sure the backward compatibility.
       *
       * @since 1.6
       */
+     @java.io.Serial
      private void writeObject(ObjectOutputStream stream) throws IOException {
          if (zoneStrings == null) {
              zoneStrings = TimeZoneNameUtility.getZoneStrings(locale);
          }
          stream.defaultWriteObject();