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

Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
2026-09-21 15:08:50 +00:00
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+# New public API in 27, each exercised once (found by diffing javap dumps, see 51-api-diff-26-to-27.txt)
+Math.acosh(2)  = 1.316958
+Math.asinh(1)  = 0.881374
+Math.atanh(.5) = 0.549306
+CHECK ok   : acosh inverts cosh
+"naïve café".length() = 10, encodedLength(UTF_8) = 12
+CHECK ok   : encodedLength matches getBytes().length without allocating the array
+BigDecimal(27).rootn(3) = 3
+CHECK ok   : rootn(3) of 27 is 3
+KeyStore.getCreationInstant("aes-key") returns an Instant: true
+CHECK ok   : KeyStore.getCreationInstant returns the entry's creation time as a java.time.Instant
+CHECK ok   : Set.ofLazy(Set, Predicate) exists (preview API)