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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/15-headers-summary.txt
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# Instance sizes in bytes, extracted from 10-, 11- and 12- transcripts
--- 10-headers-jdk26
=== java.lang.Object -> Instance size: 16 bytes
=== Point { int x; int y; } -> Instance size: 24 bytes
=== Order { long id; int quantity; boolean paid; String customer; } -> Instance size: 32 bytes
=== java.lang.Long and java.lang.Integer (boxed values) -> Instance size: 24 bytes
=== java.lang.Long and java.lang.Integer (boxed values) -> Instance size: 16 bytes
=== int[3] -> Instance size: 32 bytes
1,000,000 boxed Integer values in an ArrayList : 20,861,992 bytes
1,000,000 boxed Long values in an ArrayList : 28,861,992 bytes
1,000,000 Point objects in an ArrayList : 28,861,992 bytes
--- 11-headers-jdk27
=== java.lang.Object -> Instance size: 8 bytes
=== Point { int x; int y; } -> Instance size: 16 bytes
=== Order { long id; int quantity; boolean paid; String customer; } -> Instance size: 32 bytes
=== java.lang.Long and java.lang.Integer (boxed values) -> Instance size: 16 bytes
=== java.lang.Long and java.lang.Integer (boxed values) -> Instance size: 16 bytes
=== int[3] -> Instance size: 24 bytes
1,000,000 boxed Integer values in an ArrayList : 20,861,984 bytes
1,000,000 boxed Long values in an ArrayList : 20,861,984 bytes
1,000,000 Point objects in an ArrayList : 20,861,984 bytes
--- 12-headers-jdk27-opt-out
=== java.lang.Object -> Instance size: 16 bytes
=== Point { int x; int y; } -> Instance size: 24 bytes
=== Order { long id; int quantity; boolean paid; String customer; } -> Instance size: 32 bytes
=== java.lang.Long and java.lang.Integer (boxed values) -> Instance size: 24 bytes
=== java.lang.Long and java.lang.Integer (boxed values) -> Instance size: 16 bytes
=== int[3] -> Instance size: 32 bytes
1,000,000 boxed Integer values in an ArrayList : 20,861,992 bytes
1,000,000 boxed Long values in an ArrayList : 28,861,992 bytes
1,000,000 Point objects in an ArrayList : 28,861,992 bytes