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Add lazy-constants module: LazyConstant (JEP 531) against the holder idiom and double-checked locking

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Basics, failure semantics on 26 vs 27, lazy collections, API across 25/26/27, preview-flag traps and a JMH read-path benchmark (jars fetched and sha1-checked, not committed).

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
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Claude
2026-09-24 12:27:27 +00:00
parent af44e59e7f
commit 814c32b5ce
25 changed files with 606 additions and 0 deletions
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lazy-constants/output/01-old-ways.txt
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$ javac src/OldWays.java && java OldWays (21.0.10+7-Ubuntu-124.04)
[init] building Expensive via eager static final
main starts (the eager value already exists)
first holder() call:
[init] building Expensive via holder idiom
second holder() call:
first doubleChecked() call:
[init] building Expensive via double-checked locking
second doubleChecked() call:
$ javac src/OldWays.java && java OldWays (25.0.4.1+1-LTS)
[init] building Expensive via eager static final
main starts (the eager value already exists)
first holder() call:
[init] building Expensive via holder idiom
second holder() call:
first doubleChecked() call:
[init] building Expensive via double-checked locking
second doubleChecked() call:
$ javac src/OldWays.java && java OldWays (27+35)
[init] building Expensive via eager static final
main starts (the eager value already exists)
first holder() call:
[init] building Expensive via holder idiom
second holder() call:
first doubleChecked() call:
[init] building Expensive via double-checked locking
second doubleChecked() call: