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

@@ -1110,20 +1110,22 @@
             a[size] = null;
 
         return a;
     }
 
+    @java.io.Serial
     private static final long serialVersionUID = 876323262645176354L;
 
     /**
      * Saves the state of this {@code LinkedList} instance to a stream
      * (that is, serializes it).
      *
      * @serialData The size of the list (the number of elements it
      *             contains) is emitted (int), followed by all of its
      *             elements (each an Object) in the proper order.
      */
+    @java.io.Serial
     private void writeObject(java.io.ObjectOutputStream s)
         throws java.io.IOException {
         // Write out any hidden serialization magic
         s.defaultWriteObject();
 

@@ -1138,10 +1140,11 @@
     /**
      * Reconstitutes this {@code LinkedList} instance from a stream
      * (that is, deserializes it).
      */
     @SuppressWarnings("unchecked")
+    @java.io.Serial
     private void readObject(java.io.ObjectInputStream s)
         throws java.io.IOException, ClassNotFoundException {
         // Read in any hidden serialization magic
         s.defaultReadObject();