| 16 |
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* <tt>cancel</tt> method. Additional methods are provided to |
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* determine if the task completed normally or was cancelled. Once a |
| 18 |
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* computation has completed, the computation cannot be cancelled. |
| 19 |
+ |
* If you would like to use a <tt>Future</tt> for the sake |
| 20 |
+ |
* of cancellability but not provide a usable result, you can |
| 21 |
+ |
* declare types of the form <tt>Future<?></tt> and |
| 22 |
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* return <tt>null</tt> as a result of the underlying task. |
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* |
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* <p> |
| 25 |
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* <b>Sample Usage</b> (Note that the following classes are all |
