src/java.base/share/classes/java/util/concurrent/ConcurrentSkipListSet.java

*** 83,93 ****
   * this class does not permit the use of {@code null} elements,
   * because {@code null} arguments and return values cannot be reliably
   * distinguished from the absence of elements.
   *
   * <p>This class is a member of the
!  * <a href="{@docRoot}/java/util/package-summary.html#CollectionsFramework">
   * Java Collections Framework</a>.
   *
   * @author Doug Lea
   * @param <E> the type of elements maintained by this set
   * @since 1.6
--- 83,93 ----
   * this class does not permit the use of {@code null} elements,
   * because {@code null} arguments and return values cannot be reliably
   * distinguished from the absence of elements.
   *
   * <p>This class is a member of the
!  * <a href="{@docRoot}/java.base/java/util/package-summary.html#CollectionsFramework">
   * Java Collections Framework</a>.
   *
   * @author Doug Lea
   * @param <E> the type of elements maintained by this set
   * @since 1.6
*** 322,332 ****
       *
       * @param  c collection containing elements to be removed from this set
       * @return {@code true} if this set changed as a result of the call
       * @throws ClassCastException if the class of an element of this set
       *         is incompatible with the specified collection
!      * (<a href="{@docRoot}/java/util/Collection.html#optional-restrictions">optional</a>)
       * @throws NullPointerException if the specified collection or any
       *         of its elements are null
       */
      public boolean removeAll(Collection<?> c) {
          // Override AbstractSet version to avoid unnecessary call to size()
--- 322,332 ----
       *
       * @param  c collection containing elements to be removed from this set
       * @return {@code true} if this set changed as a result of the call
       * @throws ClassCastException if the class of an element of this set
       *         is incompatible with the specified collection
!      * (<a href="{@docRoot}/java.base/java/util/Collection.html#optional-restrictions">optional</a>)
       * @throws NullPointerException if the specified collection or any
       *         of its elements are null
       */
      public boolean removeAll(Collection<?> c) {
          // Override AbstractSet version to avoid unnecessary call to size()