src/java.base/share/classes/java/lang/Runtime.java

@@ -684,12 +684,21 @@
       * {@code runFinalization} method is not invoked explicitly.
       * <p>
       * The method {@link System#runFinalization()} is the conventional
       * and convenient means of invoking this method.
       *
+      * @deprecated Finalization has been deprecated for removal.  See
+      * {@link java.lang.Object#finalize} for background information and details
+      * about migration options.
+      * <p>
+      * When running in a JVM in which finalization has been disabled or removed,
+      * no objects will be pending finalization, so this method does nothing.
+      *
       * @see     java.lang.Object#finalize()
+      * @jls 12.6 Finalization of Class Instances
       */
+     @Deprecated(since="18", forRemoval=true)
      public void runFinalization() {
          SharedSecrets.getJavaLangRefAccess().runFinalization();
      }
  
      /**