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volatile关键字的作用、原理
source link: https://juejin.im/post/59db333b6fb9a00a69752a39
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在只有双重检查锁，没有volatile的懒加载单例模式中，由于指令重排序的问题，我确实不会拿到两个不同的单例了，但我会拿到“半个”单例。 而发挥神奇作用的volatile，可以当之无愧的被称为Java并发编程中“出现频率最高的关键字”，常用于保持内存可见性和防
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