| # | Line 20 | Line 20 | import java.util.*; | |
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| 20 | * descending iterator. The performance of ascending traversals is | |
| 21 | * likely to be faster than descending traversals. This interface | |
| 22 | * additionally defines methods {@code pollFirst} and | |
| 23 | < | * <t>pollLast</tt> that return and remove the lowest and highest key, |
| 23 | > | * {@code pollLast} that return and remove the lowest and highest key, |
| 24 | * if one exists, else returning {@code null}. | |
| 25 | * | |
| 26 | * <p>The return values of navigation methods may be ambiguous in | |
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