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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+Scan this Java file for usages of SecurityManager, Thread.stop/suspend/resume, Object.finalize, sun.misc.Unsafe memory methods, System.loadLibrary and other JNI loading, and the old java.net.URL constructors. For each finding, say which Java release changed it (SecurityManager: cannot be installed since 24; Thread.suspend/resume: still compile on 21, gone by 23; Thread.stop: throws UnsupportedOperationException on 21 and 25, removed in 26; finalize: still runs, deprecated for removal; Unsafe memory access and JNI loading: run-time warnings from 24) and give a replacement with a before/after code snippet.
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				Scan this Java file for usages of SecurityManager, Thread.stop/suspend/resume, Object.finalize, sun.misc.Unsafe memory methods, System.loadLibrary and other JNI loading, and the old java.net.URL constructors. For each finding, say which Java release changed it (SecurityManager: cannot be installed since 24; Thread.suspend/resume: still compile on 21, gone by 23; Thread.stop: throws UnsupportedOperationException on 21 and 25, removed in 26; finalize: still runs, deprecated for removal; Unsafe memory access and JNI loading: run-time warnings from 24) and give a replacement with a before/after code snippet.