hello,I am doing project on key management scheme for secure broadcasting in Java.It needs hierarchy of classes similar to e-subscription of newspaper and pay-tv systems.I've done it using three classes like
1.Read,write and download
2. Read and write
3. Read
But the problem is to implement the users subscribing to more than 1 class.and users can join,leave and shift from 1 class to another..can U please suggest me some idea of having different types of classes.

Hi, could you please provide some more info on that, eg code snippets.
Thanks

hello,I am doing project on key management scheme for secure broadcasting in Java.It needs hierarchy of classes similar to e-subscription of newspaper and pay-tv systems.I've done it using three classes like
1.Read,write and download
2. Read and write
3. Read
But the problem is to implement the users subscribing to more than 1 class.and users can join,leave and shift from 1 class to another..can U please suggest me some idea of having different types of classes.