Question: I understand what and how the Diffie Hellman Key exchange works, but can not figure out how to implement it between a Client and Server

I understand what and how the Diffie Hellman Key exchange works, but can not figure out how to implement it between a Client and Server in a chat program I am making. Please give an example of how the server could send the two publically known keys ( n and g) to client and from there they compute the shared secret key to connect and begin chatting with encrypted messages. Please show an example using JAVA. thank you.

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