[pull] main from Snailclimb:main#271
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pull[bot] merged 9 commits intoSoulballad:mainfrom Mar 8, 2026
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Clarified the behavior of ConcurrentHashMap in Java 8 regarding the transition from linked lists to red-black trees based on collision thresholds.
- java-concurrent-questions-02.md: 新增volatile内存屏障类型、读写屏障插入策略、DCL内存屏障分析、volatile与happens-before关系、volatile与synchronized性能对比 - aqs.md: 新增独占模式与共享模式深入对比、Condition条件队列工作机制及源码分析、公平锁与非公平锁性能差异分析
补充了关于并发编程的知识
Update ConcurrentHashMap summary for Java 8
Fix Shell script examples to use double brackets for safer variable comparison
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