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

@@ -122,10 +122,11 @@
      * @serial
      */
     protected int capacityIncrement;
 
     /** use serialVersionUID from JDK 1.0.2 for interoperability */
+    @java.io.Serial
     private static final long serialVersionUID = -2767605614048989439L;
 
     /**
      * Constructs an empty vector with the specified initial capacity and
      * capacity increment.

@@ -1147,10 +1148,11 @@
      * @param in the stream
      * @throws java.io.IOException if an I/O error occurs
      * @throws ClassNotFoundException if the stream contains data
      *         of a non-existing class
      */
+    @java.io.Serial
     private void readObject(ObjectInputStream in)
             throws IOException, ClassNotFoundException {
         ObjectInputStream.GetField gfields = in.readFields();
         int count = gfields.get("elementCount", 0);
         Object[] data = (Object[])gfields.get("elementData", null);

@@ -1168,10 +1170,11 @@
      * of the serialized data.
      *
      * @param s the stream
      * @throws java.io.IOException if an I/O error occurs
      */
+    @java.io.Serial
     private void writeObject(java.io.ObjectOutputStream s)
             throws java.io.IOException {
         final java.io.ObjectOutputStream.PutField fields = s.putFields();
         final Object[] data;
         synchronized (this) {