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

*** 1110,1129 ****
--- 1110,1131 ----
              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();
  
*** 1138,1147 ****
--- 1140,1150 ----
      /**
       * 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();