| 54 |
|
* used as a special return value by the <tt>poll</tt> method to |
| 55 |
|
* indicate that the queue contains no elements. |
| 56 |
|
* |
| 57 |
+ |
* <p><tt>Queue</tt> implementations generally do not define |
| 58 |
+ |
* element-based versions of methods <tt>equals</tt> and |
| 59 |
+ |
* <tt>hashCode</tt> but instead inherit the identity based versions |
| 60 |
+ |
* from class <tt>Object</tt>, because element-based equality is not |
| 61 |
+ |
* always well-defined for queues with the same elements but different |
| 62 |
+ |
* ordering properties. |
| 63 |
+ |
* |
| 64 |
+ |
* |
| 65 |
|
* <p>This interface is a member of the |
| 66 |
|
* <a href="{@docRoot}/../guide/collections/index.html"> |
| 67 |
|
* Java Collections Framework</a>. |
