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*/ |
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package java.util; |
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import java.util.*; // for javadoc (till 6280605 is fixed) |
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/** |
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* A {@link SortedMap} extended with navigation methods returning the |
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* subrange traversals in either direction using <tt>navigableSubMap</tt>. |
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* Methods <tt>navigableSubMap</tt>, <tt>navigableHeadMap</tt>, and |
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* <tt>navigableTailMap</tt> differ from the similarly named |
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* <tt>SortedMap</tt> methods only in that the returned maps |
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* are guaranteed to obey the <tt>NavigableMap</tt> interface. |
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* <tt>SortedMap</tt> methods only in their declared return types. |
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* Submaps of any <tt>NavigableMap<tt> must implement the |
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* <tt>NavigableMap</tt> interface. |
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* |
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* <p>This interface additionally defines methods <tt>firstEntry</tt>, |
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* <tt>pollFirstEntry</tt>, <tt>lastEntry</tt>, and |
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* the iteration are undefined. The set supports element removal, |
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* which removes the corresponding mapping from the map, via the |
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* <tt>Iterator.remove</tt>, <tt>Set.remove</tt>, |
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* <tt>removeAll</tt> <tt>retainAll</tt>, and <tt>clear</tt> |
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* operations. It does not support the add or <tt>addAll</tt> |
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* <tt>removeAll</tt>, <tt>retainAll</tt>, and <tt>clear</tt> |
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* operations. It does not support the <tt>add</tt> or <tt>addAll</tt> |
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* operations. |
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* |
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* @return a set view of the keys contained in this map, sorted in |
