executors: ExecutorService lifecycle companion code

Adds the executors module: shutdown() vs shutdownNow(), the graceful two-phase shutdown pattern, AutoCloseable/try-with-resources (JDK 19+), newVirtualThreadPerTaskExecutor() timing vs a bounded pool, and the submit()-without-get() lost-exception trap. 5 runnable demos, 1 JUnit correctness test class (23 tests), 6 captured output transcripts. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01FhzLY5p6okFva3qsnsRyvM
2026-09-30 06:54:17 +00:00
parent 55ee850a75
commit bc5153d2a5
17 changed files with 607 additions and 0 deletions
@@ -0,0 +1,7 @@
+=== try-with-resources: close() runs the graceful pattern automatically ===
+main: leaving the try-with-resources block now
+task-2: finished
+task-0: finished
+task-1: finished
+main: back from the try-with-resources block - the pool is terminated, every task already finished, no separate awaitTermination() call was written
+done