Permissions
A permission is a property checked by the SecurityManager. Most permissions
extend abstract class BasicPermission.
- BasicPermission is ideal for most permission names.
- But, FilePermission and SocketPermission have more complex naming systems, so they extend Permission.
- The table on page 889 of the book lists permissions.
- Note that certain permissions require arguments, such as the FilePermission. You can send it read, write, execute, or delete to specify the type of permission you are requesting.
- Others, such as RuntimePermission exitVM, do nor require extra arguments. Simply stating this permission means that it is requested.
- You can create an instance of these Permission objects and pass them to the checkPermission(Permission p) method of the SecurityManager class to see if the requested access is permitted.