| # | Line 23 | Line 23 | import java.util.*; | |
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| 23 | * <t>pollLast</tt> that return and remove the lowest and highest key, | |
| 24 | * if one exists, else returning <tt>null</tt>. | |
| 25 | * | |
| 26 | < | * <p> The return values of navigation methods may be ambiguous in |
| 26 | > | * <p>The return values of navigation methods may be ambiguous in |
| 27 | * implementations that permit <tt>null</tt> elements. However, even | |
| 28 | * in this case the result can be disambiguated by checking | |
| 29 | * <tt>contains(null)</tt>. To avoid such issues, implementations of | |
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