qiaominghe

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```java class Value extends LhsPadding { protected volatile long value; } ...省略 public void setVolatile(final long value) { UNSAFE.putLongVolatile(this, VALUE_OFFSET, value); } ``` value字段可以利用volatile内存屏障的特性来实现volatile写,这里为啥还要调用UNSAFE.putLongVolatile方法呢?这个问题百思不得其解。