First Clone the repo.

git clone https://github.com/kopildas/test02.git
cd test02

for runnging the server

javac test02\ser\server.java
java test02.ser.server

for runnging the client

javac test02\clien\Client.java
java test02.clien.Client

now you have to put the server ip addrase

and now you can comunicate to the server