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java中私有的锁对象和对象的内置锁区别?

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想请问下java并发编程实战中这句话这两个锁有啥区别,有点区分不清?


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synchroinzed锁住的对象,可以考虑使用类的私有对象,而不是this,或者其他外部可以直接访问的对象。

好处就是封装获得锁的方式。


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