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

*** 131,140 ****
--- 131,141 ----
   * @author       Mark Davis
   * @since 1.1
   */
  public abstract class Format implements Serializable, Cloneable {
  
+     @java.io.Serial
      private static final long serialVersionUID = -299282585814624189L;
  
      /**
       * Sole constructor.  (For invocation by subclass constructors, typically
       * implicit.)
*** 347,356 ****
--- 348,358 ----
       * @since 1.4
       */
      public static class Field extends AttributedCharacterIterator.Attribute {
  
          // Proclaim serial compatibility with 1.4 FCS
+         @java.io.Serial
          private static final long serialVersionUID = 276966692217360283L;
  
          /**
           * Creates a Field with the specified name.
           *