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/* |
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* Written by Doug Lea and Josh Bloch with assistance from members of JCP |
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* JSR-166 Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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package java.util; |
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* Subsets of any {@code NavigableSet} must implement the {@code |
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* NavigableSet} interface. |
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* |
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* <p> The return values of navigation methods may be ambiguous in |
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* <p>The return values of navigation methods may be ambiguous in |
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* implementations that permit {@code null} elements. However, even |
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* in this case the result can be disambiguated by checking |
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* {@code contains(null)}. To avoid such issues, implementations of |
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* implement {@code NavigableSet}, but extensions and implementations |
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* of this interface are encouraged to override these methods to return |
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* {@code NavigableSet}. |
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* |
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* |
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* <p>This interface is a member of the |
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* <a href="{@docRoot}/../technotes/guides/collections/index.html"> |
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* Java Collections Framework</a>. |
