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Add compact-strings module: Compact Strings (JEP 254) measured with JOL on JDK 25, with and without -XX:-CompactStrings, and compact object headers on 25 vs 27

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01KqJyCidz3ZgRyHABv2GVJh
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asmhatre
2026-10-01 04:23:27 +00:00
co-authored by Claude Sonnet 5.5
parent fadfd05670
commit fc05eed4b5
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@@ -69,6 +69,7 @@ These modules keep only sources, a `run.sh` and their transcripts (`output/`). T
| [`sealed/`](sealed) | Sealed Classes and Interfaces: Modelling Domains with Exhaustive switch | a `Payment` model, `permits` and the three subclass modifiers, the `default` trap, generic and recursive hierarchies, the visitor for comparison, run-time enforcement and modules |
| [`lazy-constants/`](lazy-constants) | Lazy Constants in JDK 27 (JEP 531): Replacing Double-Checked Locking | `LazyConstant` against the holder idiom and double-checked locking, the 26 to 27 failure-semantics change, `List`/`Map`/`Set.ofLazy`, the preview-flag traps and a JMH read-path benchmark |
| [`http3/`](http3) | HTTP/3 in the Java HTTP Client (JEP 517): Migrating from HttpClient 11 | Java 11 code unchanged on 25 and 26, the `HTTP_3` opt-in on client vs request, the three `H3_DISCOVERY` modes, fallback timings (including the 60 s `HTTP_3_URI_ONLY` failure), proxy downgrade, HTTP/1.1 vs 2 vs 3 under iptables packet loss, with a local Hypercorn + aioquic server |
| [`compact-strings/`](compact-strings) | Compact Strings in Java: Measured with JOL on JDK 25 (plus Compact Object Headers) | the `String` object and its `byte[]` field by field, Latin-1 vs UTF-16 footprint by length, one million strings with and without `-XX:-CompactStrings`, what flips a string to UTF-16 (and what flips it back), compact object headers on JDK 25 (opt-in) vs 27 (default), a JMH comparison of six operations |
## Captured output (`docs/output/`)