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If you want a set that is ordered, then you can use a SortedSet
interface:
Collection
Set
SortedSet
The SortedSet interface adds the following methods to those
already specified by Set:
| Method |
Description |
comparator() |
Returns the comparator associated with this sorted set, or null if it uses its elements' natural ordering. |
subSet(fromElement, toElement) |
Returns a view of the portion of this sorted set whose elements range
from fromElement, inclusive, to toElement, exclusive. (If fromElement and
toElement are equal, the returned sorted set is empty.) |
headSet(toElement) |
Returns a view of the portion of this sorted set whose elements are strictly less than
toElement. |
tailSet(fromElement) |
Returns a view of the portion of this sorted set whose elements are greater than or equal to
fromElement. |
first() |
Returns the first (lowest) element currently in this sorted set. |
last() |
Returns the last (highest) element currently in this sorted set. |
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