Question $1$:

Your application used for Store a Book, You have three client $($Admin$,$ Customer, and

Employee$)$ connected to server.

Admin:

$$ Can delete employee, show employee's number, show employee's

Info.

$$ Add and delete and edit any Book, show all books info, show total

order's prices.

Customer:

$$ Can display all books

$$ Sign up$,$ sign in$,$ See his information, See his orders, Add to Cart

and remove from Cart, Make an order, send message.

Employee:

$$ Can Show Orders, Show Employees, and Show Customers, Show

Messages.

$**$All the processes must be done in the server, all client just request from server.

Question $2$:

Create a Server called Encrypter to encrypt and decrypt text.

Server receive a string and return another string.

The encryption method will be a very simple one: to encrypt add $1$ to

each character and to decrypt subtract $1$ to each character.

Server must serve $10$ client, each client work independently without wait

another client to end his work. write code in java $($client server$)$