Feature/concurrent hash set test

[LI123456mo]

Created ConcurrentHashSetTest.java to provide unit test coverage for the ConcurrentHashSet utility.

Verified the Set property of ensuring unique elements (duplicate adds return false).

Tested the internal delegation to ConcurrentHashMap for size(), isEmpty(), and contains().

Confirmed that the iterator() correctly scrolls through the set keys.

Validated remove() and clear() functionality to ensure the set is properly cleaned.

Applied spotless formatting to match project standards.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.78%. Comparing base (a92d5d0) to head (31b3d0d).

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #16022      +/-   ##
============================================
- Coverage     60.75%   58.78%   -1.97%     
+ Complexity    11736       15   -11721     
============================================
  Files          1949     1949              
  Lines         88801    88801              
  Branches      13391    13391              
============================================
- Hits          53952    52206    -1746     
- Misses        29314    30935    +1621     
- Partials       5535     5660     +125     

Flag	Coverage Δ
integration-tests-java21	?
integration-tests-java8	?
samples-tests-java21	?
samples-tests-java8	?
unit-tests-java11	59.02% <ø> (-0.02%)	⬇️
unit-tests-java17	58.52% <ø> (+0.01%)	⬆️
unit-tests-java21	58.52% <ø> (+<0.01%)	⬆️
unit-tests-java25	58.46% <ø> (-0.02%)	⬇️
unit-tests-java8	59.03% <ø> (+<0.01%)	⬆️

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[LI123456mo]

@ZLWR can this be a duplicate pr,
can you help here see the issue

[zrlw]

Each PR should not include other PR codes, it should base on a fully new branch checked out from latest 3.3 branch.
CharSequenceComparatorTest was included in #16013 and it should not be included at this pr.

[LI123456mo]

Each PR should not include other PR codes, it should base on a fully new branch checked out from latest 3.3 branch. CharSequenceComparatorTest was included in #16013 and it should not be included at this pr.

I got it , thank you
Can I do this newly?