JavaTutorial : Java 6 Navigable Set Tutorial for Beginners

Navigable Set Interface is added in Java 6 (1.6). It is the part of Java Collection Framework.
Salient Point of Navigable Set

• Navigable Set can be accessed and Traversed in ascending or descending order.
• Performance of Ascending operation is likely to be faster than descending.

Important Methods in Navigable Set

• Lower(E e) : Returns the greatest element in this set which is less than the given element or NULL if there is no such element.
• Floor(E e ) : Returns the greatest element in this set which is less than or equal to given element or NULL if there is no such element.
• Ceiling(E e) : Returns the least element in this set which is greater than or equal to given element or NULL if there is no such element.
• Higher(E e) : Returns the least element in this set which is greater than the given element or NULL if there is no such element.
• pollFirst() : Retrieve and remove the first least element. Or return null if there is no such element.
• pollLast() : Retrieve and remove the last highest element. Or return null if there is no such element.

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