asmhatreandClaude Sonnet 5
202f2f18a5
Adds the concurrency-interview module: a real race condition with its actual lost-update count, why volatile alone doesn't fix it, a real JVM-detected deadlock (ThreadMXBean.findDeadlockedThreads()) with the fix, and ScopedValue's exact child-thread inheritance rules (finalized in JDK 25 via JEP 506, demonstrated against StructuredTaskScope, still preview per JEP 505/525). 4 runnable demos, 1 JUnit test class (9 tests), 5 captured output transcripts. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01FhzLY5p6okFva3qsnsRyvM
java-core-examples
Runnable companion code for ankurm.com's Java-core / concurrency series. One Maven module per article; each module's own README has that article's version table, quickstart, and traps.
| Module | Post |
|---|---|
jmm |
The Java Memory Model Explained: volatile, happens-before, and Why Your Double-Checked Lock Failed |
locks |
synchronized vs ReentrantLock vs StampedLock: Benchmarks and a Decision Table |
atomics |
Java Atomics and VarHandle: CAS, LongAdder, and When Atomics Beat Locks |
vt-pinning |
Diagnosing Virtual Thread Pinning in Production: JFR Events, jcmd, and Real Fixes |
synchronizers |
CountDownLatch vs CyclicBarrier vs Phaser vs Semaphore in Java |
executors |
ExecutorService Done Right: Shutdown, try-with-resources and Virtual Thread Executors |
concurrency-interview |
Top 40 Java Concurrency Interview Questions and Answers (2026) |
License
MIT - see LICENSE.