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	https://github.com/lslevy/JavaGuide/blob/main/docs/java/concurrent/java-concurrent-questions-02.md#11说一说自己对于-synchronized-关键字的了解
	https://github.com/lslevy/JavaGuide/blob/main/docs/java/concurrent/java-concurrent-questions-02.md#12-说说自己是怎么使用-synchronized-关键字
	https://github.com/lslevy/JavaGuide/blob/main/docs/java/concurrent/java-concurrent-questions-02.md#13-构造方法可以使用-synchronized-关键字修饰么
	https://github.com/lslevy/JavaGuide/blob/main/docs/java/concurrent/java-concurrent-questions-02.md#13-讲一下-synchronized-关键字的底层原理
	https://github.com/lslevy/JavaGuide/blob/main/docs/java/concurrent/java-concurrent-questions-02.md#131-synchronized-同步语句块的情况
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	https://github.com/lslevy/JavaGuide/blob/main/docs/java/concurrent/java-concurrent-questions-02.md#133总结
Java锁与线程的那些事 - 有赞技术团队	https://tech.youzan.com/javasuo-yu-xian-cheng-de-na-xie-shi/
	https://github.com/lslevy/JavaGuide/blob/main/docs/java/concurrent/java-concurrent-questions-02.md#14-说说-jdk16-之后的-synchronized-关键字底层做了哪些优化可以详细介绍一下这些优化吗
Java6 及以上版本对 synchronized 的优化	https://www.cnblogs.com/wuqinglong/p/9945618.html
	https://github.com/lslevy/JavaGuide/blob/main/docs/java/concurrent/java-concurrent-questions-02.md#15-谈谈-synchronized-和-reentrantlock-的区别
	https://github.com/lslevy/JavaGuide/blob/main/docs/java/concurrent/java-concurrent-questions-02.md#151-两者都是可重入锁
	https://github.com/lslevy/JavaGuide/blob/main/docs/java/concurrent/java-concurrent-questions-02.md#152synchronized-依赖于-jvm-而-reentrantlock-依赖于-api
	https://github.com/lslevy/JavaGuide/blob/main/docs/java/concurrent/java-concurrent-questions-02.md#153reentrantlock-比-synchronized-增加了一些高级功能
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	https://github.com/lslevy/JavaGuide/blob/main/docs/java/concurrent/java-concurrent-questions-02.md#23-并发编程的三个重要特性
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JUC 中的 Atomic 原子类总结	https://mp.weixin.qq.com/s?__biz=Mzg2OTA0Njk0OA==&mid=2247484834&idx=1&sn=7d3835091af8125c13fc6db765f4c5bd&source=41#wechat_redirect
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https://www.cnblogs.com/waterystone/p/4920797.html	https://www.cnblogs.com/waterystone/p/4920797.html
https://www.cnblogs.com/chengxiao/archive/2017/07/24/7141160.html	https://www.cnblogs.com/chengxiao/archive/2017/07/24/7141160.html
	https://github.com/lslevy/JavaGuide/blob/main/docs/java/concurrent/java-concurrent-questions-02.md#63-aqs-组件总结
	https://github.com/lslevy/JavaGuide/blob/main/docs/java/concurrent/java-concurrent-questions-02.md#64-用过-countdownlatch-么什么场景下用的
	https://github.com/lslevy/JavaGuide/blob/main/docs/java/concurrent/java-concurrent-questions-02.md#7-reference
https://www.cnblogs.com/waterystone/p/4920797.html	https://www.cnblogs.com/waterystone/p/4920797.html
https://www.cnblogs.com/chengxiao/archive/2017/07/24/7141160.html	https://www.cnblogs.com/chengxiao/archive/2017/07/24/7141160.html
https://www.journaldev.com/1076/java-threadlocal-example	https://www.journaldev.com/1076/java-threadlocal-example
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