悲观锁，乐观锁
1.synchronized和Lock https://blog.csdn.net/hefenglian/article/details/82383569
- AtomicInteger http://t.zoukankan.com/zeenzhou-p-10725209.html
- LongAdder https://blog.csdn.net/meism5/article/details/90413980
- ThreadLocal＜String＞ https://blog.csdn.net/qq_34246965/article/details/122478238
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