RFR: 8268124: Update java.lang to use switch expressions [v3]

[Mandy Chung]

On Thu, 3 Jun 2021 11:01:02 GMT, Patrick Concannon <pconcannon at openjdk.org> wrote:

>> Hi,
>> 
>> Could someone please review my code for updating the code in the `java.lang` packages to make use of the switch expressions?
>> 
>> Kind regards,
>> Patrick
>
> Patrick Concannon has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8268124: small refactoring; fixed misplaced comment and added missing lambda operator

Looks good with one minor comment in `DirectMethodHandleDescImpl.java`.

src/java.base/share/classes/java/lang/constant/DirectMethodHandleDescImpl.java line 138:

> 136:     public String lookupDescriptor() {
> 137:         return switch (kind) {
> 138:             case VIRTUAL, SPECIAL,

Nit: I prefer to have each case in a separate line (in this switch and also the switch in `resolveConstantDesc`.

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Marked as reviewed by mchung (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/4312