RFR: 8311188: Simplify and modernize equals and hashCode in java.text [v3]

[Roger Riggs]

On Wed, 5 Jul 2023 16:27:38 GMT, Pavel Rappo <prappo at openjdk.org> wrote:

>> src/java.base/share/classes/java/text/DecimalFormat.java line 2930:
>> 
>>> 2928:         DecimalFormat other = (DecimalFormat) obj;
>>> 2929:         return ((posPrefixPattern == other.posPrefixPattern &&
>>> 2930:                  positivePrefix.equals(other.positivePrefix))
>> 
>> This might also be:
>> 
>> return (obj instanceof DecimalFormat other) && 
>>                  posPrefixPattern == other.posPrefixPattern &&
>>                  positivePrefix.equals(other.positivePrefix));
>
> Do you mean we could use `obj instanceof DecimalFormat other` in front of that 30-line `&&` expression, or that we could collapse the list to exactly what you wrote?
> 
> Separately, `super.equals` already performs the class check; so enhanced `instanceof` could be used only as a syntactic sugar, but even then it won't decrease the line count: we trade one line for another very similar line.

Just what I wrote; I agree its a toss up from lines of code and performance.
I spotted that style in other files and its just a question of style; your choice.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14752#discussion_r1253433196