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关于synchronized的一些疑问

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关于synchronized的一些疑问

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这句话是不是有点问题，既然说enter和exit是重量级锁，且JDK后面版本加了偏向锁和轻量级锁，那为什么在JDK1.8下写的demo上还有会这两个字节码指令，这不是默认是重量级锁了吗


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偏向锁之类的属于jvm的机制，字节码是不变的


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