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Java 27 and 26: runnable demos and captured output for every JEP, plus version lanes

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Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
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asmhatre
2026-09-21 15:08:50 +00:00
committed by Claude
co-authored by Claude Sonnet 5
commit f59c1de96d
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docs/output/81-scoped-values.txt
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# ScopedValue (JEP 506). Preview API in 21, final in 25.
$ javac ScopedValueDemo.java (JDK 21, no flag)
<repo>/lanes/src/ScopedValueDemo.java:9: error: ScopedValue is a preview API and is disabled by default.
static final ScopedValue<String> CURRENT_USER = ScopedValue.newInstance();
^
(use --enable-preview to enable preview APIs)
<repo>/lanes/src/ScopedValueDemo.java:9: error: ScopedValue is a preview API and is disabled by default.
static final ScopedValue<String> CURRENT_USER = ScopedValue.newInstance();
^
(use --enable-preview to enable preview APIs)
<repo>/lanes/src/ScopedValueDemo.java:13: error: ScopedValue is a preview API and is disabled by default.
ScopedValue.where(CURRENT_USER, "ankur").run(() -> {
^
(use --enable-preview to enable preview APIs)
3 errors
exit=1
$ javac ScopedValueDemo.java (JDK 25, no flag)
exit=0
$ java ScopedValueDemo (JDK 25)
java.version = 25.0.4.1
CHECK ok : inside the scope: CURRENT_USER.get() == ankur
CHECK ok : a method that was never passed the value still sees it
CHECK ok : outside the scope: CURRENT_USER.get() throws NoSuchElementException
$ javac ScopedValueDemo.java (JDK 26, no flag)
exit=0
$ java ScopedValueDemo (JDK 26)
java.version = 26.0.2.1
CHECK ok : inside the scope: CURRENT_USER.get() == ankur
CHECK ok : a method that was never passed the value still sees it
CHECK ok : outside the scope: CURRENT_USER.get() throws NoSuchElementException
$ javac ScopedValueDemo.java (JDK 27, no flag)
exit=0
$ java ScopedValueDemo (JDK 27)
java.version = 27
CHECK ok : inside the scope: CURRENT_USER.get() == ankur
CHECK ok : a method that was never passed the value still sees it
CHECK ok : outside the scope: CURRENT_USER.get() throws NoSuchElementException