At 5:22 PM -0700 4/18/02, Thomas Wang wrote:
>
>
>Also, refresh my memory about how should we write immutable object source
>codes now? (under the new memory model)
OK, here is a guideline for creating immutable objects under the new
memory model:
If you want an object X to be immutable in the presence of data races
by uses of the object:
* every field of X should be final
* any data structure reachable from fields of X should be either:
- immutable, or
- only reachable by threads other than the creating
thread via fields of object X
For example, String will contain a final reference to a character
array, and the only way for another thread to see that character
array is through the final reference.
Bill
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