asmhatreandClaude Sonnet 5
d4b3a63615
Companion code for the ankurm.com post "Top 40 Java Collections Interview Questions (HashMap Internals to Fail-Fast Iterators)". Verified against JDK 25's own HashMap source (TREEIFY_THRESHOLD=8, UNTREEIFY_THRESHOLD=6, MIN_TREEIFY_CAPACITY=64), with every claim backed by a committed docs/output/*.txt transcript from a real run. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01YXCrLgRKFgCh9RHKW8xaqJ
32 lines
1.4 KiB
Bash
Executable File
32 lines
1.4 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Regenerates every file in docs/output/ from scratch. Run from the module root
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# (java-interview-lab/collections).
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#
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# Needs JDK 25 (LTS) on PATH as `java`/`javac`, and a `mvn` that can reach Maven Central the
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# first time (surefire/compiler plugins must be cached locally before -o works).
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set -eu
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cd "$(dirname "$0")/.."
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echo "== compiling =="
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mvn -q -B compile
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echo "== 01/02: reflection into HashMap internals, with and without --add-opens =="
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mkdir -p docs/output
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java -cp target/classes com.ankurm.interviewlab.collections.ReflectionAddOpensDemo \
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> docs/output/01-reflection-without-add-opens.txt 2>&1 || true
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java --add-opens java.base/java.util=ALL-UNNAMED -cp target/classes \
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com.ankurm.interviewlab.collections.ReflectionAddOpensDemo \
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> docs/output/02-reflection-with-add-opens.txt 2>&1
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# Strip the sandbox's own proxy/trust-store banner (JAVA_TOOL_OPTIONS) - it is environment
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# noise, not part of either demonstration, and should not be in a committed transcript.
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for f in docs/output/01-reflection-without-add-opens.txt docs/output/02-reflection-with-add-opens.txt; do
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grep -v '^Picked up JAVA_TOOL_OPTIONS' "$f" > "$f.tmp" && mv "$f.tmp" "$f"
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done
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echo "== 03-10: JUnit-driven transcripts (BucketLayoutTest, TreeifyTriggerTest, ConcurrentModificationTest, EqualsHashCodeContractTest) =="
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mvn -q -B test
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echo "== done - docs/output now contains: =="
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ls -1 docs/output
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