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并发编程中的三个主要问题https://github.com/JR-Rong/bestJavaer/blob/master/java-concurrent/java-volatile.md#%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B%E4%B8%AD%E7%9A%84%E4%B8%89%E4%B8%AA%E4%B8%BB%E8%A6%81%E9%97%AE%E9%A2%98
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volatile 的实现原理https://github.com/JR-Rong/bestJavaer/blob/master/java-concurrent/java-volatile.md#volatile-%E7%9A%84%E5%AE%9E%E7%8E%B0%E5%8E%9F%E7%90%86
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如何正确的使用 volatile 变量https://github.com/JR-Rong/bestJavaer/blob/master/java-concurrent/java-volatile.md#%E5%A6%82%E4%BD%95%E6%AD%A3%E7%A1%AE%E7%9A%84%E4%BD%BF%E7%94%A8-volatile-%E5%8F%98%E9%87%8F
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读-写锁https://github.com/JR-Rong/bestJavaer/blob/master/java-concurrent/java-volatile.md#%E8%AF%BB-%E5%86%99%E9%94%81
https://github.com/JR-Rong/bestJavaer/blob/master/java-concurrent/java-volatile.md#先从内存模型谈起
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