pls help this code

java programming language

Develop a simple application that uses UDP to provide end-to-end reliability between A and B stop&wait protocol.

selected file between 1 and 10 MB in size via relay server.

Build a simple File Transfer Service that consists of a client and server.

The server exports a set of files from the computer on which it runs to be downloaded on the client computer.

That is: a client requests a file from the server and the server responds to the client by sending the file.

Client will request one file at a time. Server will send the contents of the file followed by end-offile and then exits.

Client must save the file on the local computer with the same file name.