On Wed, 4 May 2022 15:02:43 GMT, liach <d...@openjdk.java.net> wrote:
>> test/jdk/java/util/IdentityHashMap/Basic.java line 500:
>>
>>> 498: Box newKey = new Box(k1a);
>>> 499: Box newVal = new Box(v1a);
>>> 500: Box r = map.computeIfAbsent(newKey, k -> { called[0] = true;
>>> return newVal; });
>>
>> More of a curiosity than a review comment - I see that various places in
>> this PR use a boolean array with one element instead of just a boolean type.
>> Is that a personal coding preference or is there something more to it?
>
> This just serves as a modifiable boolean like an AtomicBoolean. Remember
> lambdas can only use final local var references (due to how they work), and
> it cannot access or modify the local variable in the caller method.
Yes, that's it; you can't mutate a local variable captured by a lambda.
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PR: https://git.openjdk.java.net/jdk/pull/8354
