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为何finalize不一定会被调用？

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为何finalize不一定会被调用？

书上有句话:"你不知道finalize()会不会被调用（即使能确定他调用，也不知道在什么时候调用）"，这里的“你不知道finalize()会不会被调用”该怎么理解，不是说对象被回收前一定会调用这个方法吗?


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因为不知道什么时候对象被回收啊


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