7029997: Restyling of SortedMap Javadoc

Reviewed-by: darcy, chegar

src/share/classes/java/util/SortedMap.java

@@ -26,69 +26,70 @@
 package java.util;
 
 /**
- * A {@link Map} that further provides a <i>total ordering</i> on its keys.
+ * A {@link Map} that further provides a <em>total ordering</em> on its keys.
  * The map is ordered according to the {@linkplain Comparable natural
  * ordering} of its keys, or by a {@link Comparator} typically
  * provided at sorted map creation time.  This order is reflected when
  * iterating over the sorted map's collection views (returned by the
- * <tt>entrySet</tt>, <tt>keySet</tt> and <tt>values</tt> methods).
+ * {@code entrySet}, {@code keySet} and {@code values} methods).
  * Several additional operations are provided to take advantage of the
- * ordering.  (This interface is the map analogue of {@link
- * SortedSet}.)
+ * ordering.  (This interface is the map analogue of {@link SortedSet}.)
  *
- * <p>All keys inserted into a sorted map must implement the <tt>Comparable</tt>
+ * <p>All keys inserted into a sorted map must implement the {@code Comparable}
  * interface (or be accepted by the specified comparator).  Furthermore, all
- * such keys must be <i>mutually comparable</i>: <tt>k1.compareTo(k2)</tt> (or
- * <tt>comparator.compare(k1, k2)</tt>) must not throw a
- * <tt>ClassCastException</tt> for any keys <tt>k1</tt> and <tt>k2</tt> in
+ * such keys must be <em>mutually comparable</em>: {@code k1.compareTo(k2)} (or
+ * {@code comparator.compare(k1, k2)}) must not throw a
+ * {@code ClassCastException} for any keys {@code k1} and {@code k2} in
  * the sorted map.  Attempts to violate this restriction will cause the
  * offending method or constructor invocation to throw a
- * <tt>ClassCastException</tt>.
+ * {@code ClassCastException}.
  *
  * <p>Note that the ordering maintained by a sorted map (whether or not an
- * explicit comparator is provided) must be <i>consistent with equals</i> if
- * the sorted map is to correctly implement the <tt>Map</tt> interface.  (See
- * the <tt>Comparable</tt> interface or <tt>Comparator</tt> interface for a
- * precise definition of <i>consistent with equals</i>.)  This is so because
- * the <tt>Map</tt> interface is defined in terms of the <tt>equals</tt>
+ * explicit comparator is provided) must be <em>consistent with equals</em> if
+ * the sorted map is to correctly implement the {@code Map} interface.  (See
+ * the {@code Comparable} interface or {@code Comparator} interface for a
+ * precise definition of <em>consistent with equals</em>.)  This is so because
+ * the {@code Map} interface is defined in terms of the {@code equals}
  * operation, but a sorted map performs all key comparisons using its
- * <tt>compareTo</tt> (or <tt>compare</tt>) method, so two keys that are
+ * {@code compareTo} (or {@code compare}) method, so two keys that are
  * deemed equal by this method are, from the standpoint of the sorted map,
- * equal.  The behavior of a tree map <i>is</i> well-defined even if its
+ * equal.  The behavior of a tree map <em>is</em> well-defined even if its
  * ordering is inconsistent with equals; it just fails to obey the general
- * contract of the <tt>Map</tt> interface.
+ * contract of the {@code Map} interface.
  *
- * <p>All general-purpose sorted map implementation classes should
- * provide four "standard" constructors: 1) A void (no arguments)
- * constructor, which creates an empty sorted map sorted according to
- * the natural ordering of its keys.  2) A constructor with a
- * single argument of type <tt>Comparator</tt>, which creates an empty
- * sorted map sorted according to the specified comparator.  3) A
- * constructor with a single argument of type <tt>Map</tt>, which
- * creates a new map with the same key-value mappings as its argument,
- * sorted according to the keys' natural ordering.  4) A constructor
- * with a single argument of type <tt>SortedMap</tt>,
- * which creates a new sorted map with the same key-value mappings and
- * the same ordering as the input sorted map.  There is no way to
- * enforce this recommendation, as interfaces cannot contain
- * constructors.
+ * <p>All general-purpose sorted map implementation classes should provide four
+ * "standard" constructors. It is not possible to enforce this recommendation
+ * though as required constructors cannot be specified by interfaces. The
+ * expected "standard" constructors for all sorted map implementations are:
+ * <ol>
+ *   <li>A void (no arguments) constructor, which creates an empty sorted map
+ *   sorted according to the natural ordering of its keys.</li>
+ *   <li>A constructor with a single argument of type {@code Comparator}, which
+ *   creates an empty sorted map sorted according to the specified comparator.</li>
+ *   <li>A constructor with a single argument of type {@code Map}, which creates
+ *   a new map with the same key-value mappings as its argument, sorted
+ *   according to the keys' natural ordering.</li>
+ *   <li>A constructor with a single argument of type {@code SortedMap}, which
+ *   creates a new sorted map with the same key-value mappings and the same
+ *   ordering as the input sorted map.</li>
+ * </ol>
  *
- * <p>Note: several methods return submaps with restricted key ranges.
- * Such ranges are <i>half-open</i>, that is, they include their low
+ * <p><strong>Note</strong>: several methods return submaps with restricted key
+ * ranges. Such ranges are <em>half-open</em>, that is, they include their low
  * endpoint but not their high endpoint (where applicable).  If you need a
- * <i>closed range</i> (which includes both endpoints), and the key type
+ * <em>closed range</em> (which includes both endpoints), and the key type
  * allows for calculation of the successor of a given key, merely request
- * the subrange from <tt>lowEndpoint</tt> to
- * <tt>successor(highEndpoint)</tt>.  For example, suppose that <tt>m</tt>
+ * the subrange from {@code lowEndpoint} to
+ * {@code successor(highEndpoint)}.  For example, suppose that {@code m}
  * is a map whose keys are strings.  The following idiom obtains a view
- * containing all of the key-value mappings in <tt>m</tt> whose keys are
- * between <tt>low</tt> and <tt>high</tt>, inclusive:<pre>
+ * containing all of the key-value mappings in {@code m} whose keys are
+ * between {@code low} and {@code high}, inclusive:<pre>
  *   SortedMap&lt;String, V&gt; sub = m.subMap(low, high+"\0");</pre>
  *
- * A similar technique can be used to generate an <i>open range</i>
+ * A similar technique can be used to generate an <em>open range</em>
  * (which contains neither endpoint).  The following idiom obtains a
- * view containing all of the key-value mappings in <tt>m</tt> whose keys
- * are between <tt>low</tt> and <tt>high</tt>, exclusive:<pre>
+ * view containing all of the key-value mappings in {@code m} whose keys
+ * are between {@code low} and {@code high}, exclusive:<pre>
  *   SortedMap&lt;String, V&gt; sub = m.subMap(low+"\0", high);</pre>
  *
  * <p>This interface is a member of the
@@ -112,96 +113,96 @@ package java.util;
 public interface SortedMap<K,V> extends Map<K,V> {
     /**
      * Returns the comparator used to order the keys in this map, or
-     * <tt>null</tt> if this map uses the {@linkplain Comparable
+     * {@code null} if this map uses the {@linkplain Comparable
      * natural ordering} of its keys.
      *
      * @return the comparator used to order the keys in this map,
-     *         or <tt>null</tt> if this map uses the natural ordering
+     *         or {@code null} if this map uses the natural ordering
      *         of its keys
      */
     Comparator<? super K> comparator();
 
     /**
      * Returns a view of the portion of this map whose keys range from
-     * <tt>fromKey</tt>, inclusive, to <tt>toKey</tt>, exclusive.  (If
-     * <tt>fromKey</tt> and <tt>toKey</tt> are equal, the returned map
+     * {@code fromKey}, inclusive, to {@code toKey}, exclusive.  (If
+     * {@code fromKey} and {@code toKey} are equal, the returned map
      * is empty.)  The returned map is backed by this map, so changes
      * in the returned map are reflected in this map, and vice-versa.
      * The returned map supports all optional map operations that this
      * map supports.
      *
-     * <p>The returned map will throw an <tt>IllegalArgumentException</tt>
+     * <p>The returned map will throw an {@code IllegalArgumentException}
      * on an attempt to insert a key outside its range.
      *
      * @param fromKey low endpoint (inclusive) of the keys in the returned map
      * @param toKey high endpoint (exclusive) of the keys in the returned map
      * @return a view of the portion of this map whose keys range from
-     *         <tt>fromKey</tt>, inclusive, to <tt>toKey</tt>, exclusive
-     * @throws ClassCastException if <tt>fromKey</tt> and <tt>toKey</tt>
+     *         {@code fromKey}, inclusive, to {@code toKey}, exclusive
+     * @throws ClassCastException if {@code fromKey} and {@code toKey}
      *         cannot be compared to one another using this map's comparator
      *         (or, if the map has no comparator, using natural ordering).
      *         Implementations may, but are not required to, throw this
-     *         exception if <tt>fromKey</tt> or <tt>toKey</tt>
+     *         exception if {@code fromKey} or {@code toKey}
      *         cannot be compared to keys currently in the map.
-     * @throws NullPointerException if <tt>fromKey</tt> or <tt>toKey</tt>
+     * @throws NullPointerException if {@code fromKey} or {@code toKey}
      *         is null and this map does not permit null keys
-     * @throws IllegalArgumentException if <tt>fromKey</tt> is greater than
-     *         <tt>toKey</tt>; or if this map itself has a restricted
-     *         range, and <tt>fromKey</tt> or <tt>toKey</tt> lies
+     * @throws IllegalArgumentException if {@code fromKey} is greater than
+     *         {@code toKey}; or if this map itself has a restricted
+     *         range, and {@code fromKey} or {@code toKey} lies
      *         outside the bounds of the range
      */
     SortedMap<K,V> subMap(K fromKey, K toKey);
 
     /**
      * Returns a view of the portion of this map whose keys are
-     * strictly less than <tt>toKey</tt>.  The returned map is backed
+     * strictly less than {@code toKey}.  The returned map is backed
      * by this map, so changes in the returned map are reflected in
      * this map, and vice-versa.  The returned map supports all
      * optional map operations that this map supports.
      *
-     * <p>The returned map will throw an <tt>IllegalArgumentException</tt>
+     * <p>The returned map will throw an {@code IllegalArgumentException}
      * on an attempt to insert a key outside its range.
      *
      * @param toKey high endpoint (exclusive) of the keys in the returned map
      * @return a view of the portion of this map whose keys are strictly
-     *         less than <tt>toKey</tt>
-     * @throws ClassCastException if <tt>toKey</tt> is not compatible
+     *         less than {@code toKey}
+     * @throws ClassCastException if {@code toKey} is not compatible
      *         with this map's comparator (or, if the map has no comparator,
-     *         if <tt>toKey</tt> does not implement {@link Comparable}).
+     *         if {@code toKey} does not implement {@link Comparable}).
      *         Implementations may, but are not required to, throw this
-     *         exception if <tt>toKey</tt> cannot be compared to keys
+     *         exception if {@code toKey} cannot be compared to keys
      *         currently in the map.
-     * @throws NullPointerException if <tt>toKey</tt> is null and
+     * @throws NullPointerException if {@code toKey} is null and
      *         this map does not permit null keys
      * @throws IllegalArgumentException if this map itself has a
-     *         restricted range, and <tt>toKey</tt> lies outside the
+     *         restricted range, and {@code toKey} lies outside the
      *         bounds of the range
      */
     SortedMap<K,V> headMap(K toKey);
 
     /**
      * Returns a view of the portion of this map whose keys are
-     * greater than or equal to <tt>fromKey</tt>.  The returned map is
+     * greater than or equal to {@code fromKey}.  The returned map is
      * backed by this map, so changes in the returned map are
      * reflected in this map, and vice-versa.  The returned map
      * supports all optional map operations that this map supports.
      *
-     * <p>The returned map will throw an <tt>IllegalArgumentException</tt>
+     * <p>The returned map will throw an {@code IllegalArgumentException}
      * on an attempt to insert a key outside its range.
      *
      * @param fromKey low endpoint (inclusive) of the keys in the returned map
      * @return a view of the portion of this map whose keys are greater
-     *         than or equal to <tt>fromKey</tt>
-     * @throws ClassCastException if <tt>fromKey</tt> is not compatible
+     *         than or equal to {@code fromKey}
+     * @throws ClassCastException if {@code fromKey} is not compatible
      *         with this map's comparator (or, if the map has no comparator,
-     *         if <tt>fromKey</tt> does not implement {@link Comparable}).
+     *         if {@code fromKey} does not implement {@link Comparable}).
      *         Implementations may, but are not required to, throw this
-     *         exception if <tt>fromKey</tt> cannot be compared to keys
+     *         exception if {@code fromKey} cannot be compared to keys
      *         currently in the map.
-     * @throws NullPointerException if <tt>fromKey</tt> is null and
+     * @throws NullPointerException if {@code fromKey} is null and
      *         this map does not permit null keys
      * @throws IllegalArgumentException if this map itself has a
-     *         restricted range, and <tt>fromKey</tt> lies outside the
+     *         restricted range, and {@code fromKey} lies outside the
      *         bounds of the range
      */
     SortedMap<K,V> tailMap(K fromKey);
@@ -228,12 +229,12 @@ public interface SortedMap<K,V> extends Map<K,V> {
      * The set is backed by the map, so changes to the map are
      * reflected in the set, and vice-versa.  If the map is modified
      * while an iteration over the set is in progress (except through
-     * the iterator's own <tt>remove</tt> operation), the results of
+     * the iterator's own {@code remove} operation), the results of
      * the iteration are undefined.  The set supports element removal,
      * which removes the corresponding mapping from the map, via the
-     * <tt>Iterator.remove</tt>, <tt>Set.remove</tt>,
-     * <tt>removeAll</tt>, <tt>retainAll</tt>, and <tt>clear</tt>
-     * operations.  It does not support the <tt>add</tt> or <tt>addAll</tt>
+     * {@code Iterator.remove}, {@code Set.remove},
+     * {@code removeAll}, {@code retainAll}, and {@code clear}
+     * operations.  It does not support the {@code add} or {@code addAll}
      * operations.
      *
      * @return a set view of the keys contained in this map, sorted in
@@ -248,13 +249,13 @@ public interface SortedMap<K,V> extends Map<K,V> {
      * The collection is backed by the map, so changes to the map are
      * reflected in the collection, and vice-versa.  If the map is
      * modified while an iteration over the collection is in progress
-     * (except through the iterator's own <tt>remove</tt> operation),
+     * (except through the iterator's own {@code remove} operation),
      * the results of the iteration are undefined.  The collection
      * supports element removal, which removes the corresponding
-     * mapping from the map, via the <tt>Iterator.remove</tt>,
-     * <tt>Collection.remove</tt>, <tt>removeAll</tt>,
-     * <tt>retainAll</tt> and <tt>clear</tt> operations.  It does not
-     * support the <tt>add</tt> or <tt>addAll</tt> operations.
+     * mapping from the map, via the {@code Iterator.remove},
+     * {@code Collection.remove}, {@code removeAll},
+     * {@code retainAll} and {@code clear} operations.  It does not
+     * support the {@code add} or {@code addAll} operations.
      *
      * @return a collection view of the values contained in this map,
      *         sorted in ascending key order
@@ -267,14 +268,14 @@ public interface SortedMap<K,V> extends Map<K,V> {
      * The set is backed by the map, so changes to the map are
      * reflected in the set, and vice-versa.  If the map is modified
      * while an iteration over the set is in progress (except through
-     * the iterator's own <tt>remove</tt> operation, or through the
-     * <tt>setValue</tt> operation on a map entry returned by the
+     * the iterator's own {@code remove} operation, or through the
+     * {@code setValue} operation on a map entry returned by the
      * iterator) the results of the iteration are undefined.  The set
      * supports element removal, which removes the corresponding
-     * mapping from the map, via the <tt>Iterator.remove</tt>,
-     * <tt>Set.remove</tt>, <tt>removeAll</tt>, <tt>retainAll</tt> and
-     * <tt>clear</tt> operations.  It does not support the
-     * <tt>add</tt> or <tt>addAll</tt> operations.
+     * mapping from the map, via the {@code Iterator.remove},
+     * {@code Set.remove}, {@code removeAll}, {@code retainAll} and
+     * {@code clear} operations.  It does not support the
+     * {@code add} or {@code addAll} operations.
      *
      * @return a set view of the mappings contained in this map,
      *         sorted in ascending key order