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理解 JVM：Java 内存模型（三）—— 锁 | alexpdh's blog
source link: http://alexpdh.com/2017/11/12/java-memory-model-03/?
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什么是线程安全？线程安全是指当一个对象被多个线程访问操作时，最终都能得到正确的结果，那这个对象是线程安全的。Java 中可以通过同步块和加锁保障线程安全。
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