--- old/src/java.base/share/classes/java/text/NumberFormat.java	2019-08-27 17:28:24.350324386 -0700
+++ new/src/java.base/share/classes/java/text/NumberFormat.java	2019-08-27 17:28:24.178324386 -0700
@@ -1013,6 +1013,7 @@
      *
      * @since 1.2
      */
+    @java.io.Serial
     private void readObject(ObjectInputStream stream)
          throws IOException, ClassNotFoundException
     {
@@ -1041,6 +1042,7 @@
      *
      * @since 1.2
      */
+    @java.io.Serial
     private void writeObject(ObjectOutputStream stream)
          throws IOException
     {
@@ -1225,6 +1227,7 @@
 
     // Removed "implements Cloneable" clause.  Needs to update serialization
     // ID for backward compatibility.
+    @java.io.Serial
     static final long serialVersionUID = -2308460125733713944L;
 
 
@@ -1242,6 +1245,7 @@
     public static class Field extends Format.Field {
 
         // Proclaim serial compatibility with 1.4 FCS
+        @java.io.Serial
         private static final long serialVersionUID = 7494728892700160890L;
 
         // table of all instances in this class, used by readResolve
@@ -1267,6 +1271,7 @@
          * @return resolved NumberFormat.Field constant
          */
         @Override
+        @java.io.Serial
         protected Object readResolve() throws InvalidObjectException {
             if (this.getClass() != NumberFormat.Field.class) {
                 throw new InvalidObjectException("subclass didn't correctly implement readResolve");