On Mon, 5 Jul 2021 14:03:18 GMT, Сергей Цыпанов 
<github.com+10835776+stsypa...@openjdk.org> wrote:

>> Usage of thread-safe collection `Vector` is unnecessary. It's recommended to 
>> use `ArrayList` if a thread-safe implementation is not needed. In 
>> post-BiasedLocking times, this is gets worse, as every access is 
>> synchronized.
>> I checked only places where `Vector` was used as local variable.
>
> src/java.desktop/share/classes/java/awt/Menu.java line 489:
> 
>> 487:     }
>> 488: 
>> 489:     synchronized Enumeration<MenuShortcut> shortcuts() {
> 
> I'm not sure whether it's ok to change return type here, probably it'd be 
> better to keep `Enumeration` and use `return 
> Collections.enumeration(shortcuts);` in the last line

It's not a public API. As I see from other PR/commits changing package-private 
methods shouldn't be a problem.

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PR: https://git.openjdk.java.net/jdk/pull/4680

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