避免该错误的关键是了解之前发生(happens-before)的关系。确保内存通过具体的语句写入数据对另一条具体语句是可见的。
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在之前发生（happens-before） ”的顺序。
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happens-before规则如下： volatile变量法则：对 volatile 域的写入操作 happens-before 于每一个后续对同一域的读操作。
Happens Before 发生之前
happens-before-relation 发生序关系
But Before This Happens 但在这之前
before it happens 未然
prevent trouble before it happens 有备无患
A call to Thread.start on a thread happens-before any actions in the started thread.
对一个线程的Thread . start调用happens - before在启动的线程中的所有操作。
youdao
But what happens before the resurrection?
复活之前要发生什么事？
What happens before what?
在这之前发生了什么？
If this happens before mid-2010 I'll be surprised.
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But every once in a while, something happens that we have never seen before -- something unique.
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Professional traders at leading hedge funds use technical analysis to identify such low-risk levels before the move happens.
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