The SecurityManager class has, of course, been retained for backward compatibility, but its newer implementation delegates to the underlying AccessController.
当然，为了向后兼容性保留了securitymanager类，但是其更新的实现委派给了底层的AccessController。
The SecurityManager class has, of course, been retained for backward compatibility, but its newer implementation delegates to the underlying AccessController.
当然，为了向后兼容性保留了securitymanager类，但是其更新的实现委派给了底层的AccessController。
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