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docs/java/concurrent/optimistic-lock-and-pessimistic-lock.md
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像 Java 中`synchronized`和`ReentrantLock`等独占锁就是悲观锁思想的实现。 像 Java 中`synchronized`和`ReentrantLock`等独占锁就是悲观锁思想的实现。
**悲观锁通常多用于写多比较多的情况下（多写场景），避免频繁失败和重试影响性能。** **悲观锁通常多用于写比较多的情况下（多写场景），避免频繁失败和重试影响性能。**
## 什么是乐观锁？使用场景是什么？ ## 什么是乐观锁？使用场景是什么？