The ProtectionDomains returned do not include the system domain.
返回的 ProtectionDomain s 不包括系统域。
This is called the system domain and includes classes loaded by the system (application) loader, the extensions loader, and the bootstrap loader.
这称为系统域并包括由系统(应用程序)装载器、扩展装载器和bootstrap装载器装载的类。
The system domain has all permissions by definition, so there is no need to check if the requested permission is so "implied" (it will always be).
系统域定义为具有所有权限,所以不需要检查是否“隐含”了所需要的权限(它总是隐含的)。
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