Java Foundations, Collections, Concurrency and JVM Quick Reference
A Chinese-language ZIP reference for Java language fundamentals, collections, thread coordination, memory, garbage collection and JVM behavior.
What this Java reference covers
This Chinese-language ZIP connects Java language fundamentals with collection choice, thread coordination and JVM runtime behavior. It is designed for study, interview review and small experiments that turn object models, visibility, races, memory and garbage collection into observable evidence.
The English page is a searchable summary and file guide. JDK versions, runtime flags and library behavior differ, so each experiment should retain its JDK version, input, output, run count and workload assumptions.
A minimal-experiment workflow
Choose one concept, write a short reproducible program, compare collection or synchronization choices under a stated workload, and then inspect heap, stack, class loading, GC or thread-state signals before explaining the result.
File and scope note
The indexed ZIP is 6.02 MB. Treat runtime tuning as an environment-specific experiment; do not copy a JVM flag or performance conclusion into another workload without validation. Content review date: 2026-08-23.
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Java and JVM study guide
Learn Java through small experiments that connect language, collections, concurrency and runtime observations.
Before you start
- Know Java classes, interfaces, exceptions and basic compile or run commands.
- Have a ZIP extractor and a repeatable JDK environment.
- Keep an experiment table for JDK version, code, output, conclusion and open questions.
Quick start
- 01
Index the four themes
Separate fundamentals, collections, concurrency and JVM topics, then choose one small question from one theme.
- 02
Write a minimal experiment
Keep the program short, record input, output, exception behavior and JDK version, and avoid copying a complex project as a black box.
- 03
Compare choices
Explain a collection or synchronization choice using data scale, access pattern, ordering, coordination and memory cost.
- 04
Observe runtime signals
Record heap, stack, GC, class-loading or thread-state evidence before proposing a cause or optimization.
Usage tips
- Attach collection decisions to read/write ratio, ordering, concurrency and memory rather than a single benchmark claim.
- Record thread count, wait conditions and timeout behavior, and clean up threads and temporary resources after tests.
- Keep JDK version and workload with every JVM or GC observation.
Troubleshooting and uninstall
An experiment gives different results on different runs. How should I study it?
Record scheduling, shared state, locks or atomic operations and run count, then construct a repeatable failing sample before changing code.
The archive has too many chapters. Where should I begin?
Pick one small question such as collection traversal or thread coordination, finish its experiment, and expand to the adjacent chapter.
Frequently asked questions
Is this Java reference for beginners?
It suits learners who know basic syntax and want a structured path through collections, concurrency and JVM behavior; start with small experiments.
How should Java collections be compared?
Compare data structure, access pattern, ordering, concurrency needs and memory cost rather than memorizing class names alone.
Can JVM flags be copied between projects?
Runtime behavior depends on JDK version, memory, workload and application structure; validate flags under the target workload and keep a rollback path.