Assignment 1 : End-to-end Messaging System

Commands for the application :

Commands are case insensitive.

1. Signup - signup <username> <password> after which user is prompted to enter his name and roll number.
2. Login - login <username> <password>
3. Join a group - join <group_name>
4. Create a group - create <group_name>
5. Send a message to a peer - send <username> <msg>
6. Send message to a group - sendgroup <group_name> <msg>
7. List all the groups -list
8. Send a file - send file <username> <filename>

Code is written follwing the object oriented style.Below is the class diagram depicting the same :