src/java.base/share/classes/java/util/SimpleTimeZone.java

*** 1240,1249 ****
--- 1240,1250 ----
       * @since 1.4
       */
      public static final int UTC_TIME = 2;
  
      // Proclaim compatibility with 1.1
+     @java.io.Serial
      static final long serialVersionUID = -403250971215465050L;
  
      // the internal serial version which says which version was written
      // - 0 (default) for version up to JDK 1.1.3
      // - 1 for version from JDK 1.1.4, which includes 3 new fields
*** 1634,1643 ****
--- 1635,1645 ----
       * <code>endDay</code>, and <code>endDayOfWeek</code>.  The values of these
       * fields in the required section are approximate values suited to the rule
       * mode <code>DOW_IN_MONTH_MODE</code>, which is the only mode recognized by
       * JDK 1.1.
       */
+     @java.io.Serial
      private void writeObject(ObjectOutputStream stream)
           throws IOException
      {
          // Construct a binary rule
          byte[] rules = packRules();
*** 1664,1673 ****
--- 1666,1676 ----
       * Reconstitute this object from a stream (i.e., deserialize it).
       *
       * We handle both JDK 1.1
       * binary formats and full formats with a packed byte array.
       */
+     @java.io.Serial
      private void readObject(ObjectInputStream stream)
           throws IOException, ClassNotFoundException
      {
          stream.defaultReadObject();