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hashmap-concurrenthashmap: companion code for the HashMap vs ConcurrentHashMap interview guide

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Adds JMH put/get throughput benchmarks (synchronizedMap vs ConcurrentHashMap,
swept at 1/2/4/8 threads), a computeIfAbsent recursion trap demo (CHM tolerates
recursion into a different key but throws IllegalStateException on the same
key; plain HashMap throws ConcurrentModificationException even single-threaded),
and a null-handling demo (CHM rejects null keys/values on put() and null keys
on get() too). 7/7 JUnit tests pass; all output/ transcripts captured from
real runs.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01FhzLY5p6okFva3qsnsRyvM
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asmhatre
2026-09-30 09:29:06 +00:00
co-authored by Claude Sonnet 5
parent af615cc17c
commit 4a74153d87
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@@ -13,6 +13,7 @@ article; each module's own README has that article's version table, quickstart,
| [`executors`](executors/) | ExecutorService Done Right: Shutdown, try-with-resources and Virtual Thread Executors |
| [`concurrency-interview`](concurrency-interview/) | Top 40 Java Concurrency Interview Questions and Answers (2026) |
| [`arithmetic`](arithmetic/) | Add Two Numbers in Java Without Overflow: addExact, Widening, and BigInteger |
| [`hashmap-concurrenthashmap`](hashmap-concurrenthashmap/) | Java HashMap vs ConcurrentHashMap: Complete Interview Guide |
## License