How do i create a simple java client that sends a connection to the localhost on port 8081?

This is to test this problem:

Write, test, and debug a Java program or any other programming language you prefer that functions as an echo server. When the program starts, it should open a server socket to listen for connections on port 8081. When a client connection is received, the program should create a new thread to handle the connection. The worker thread should read a single line of text from the connection (up to the newline character), write the line back to the client connection, and close the connection. The program should accept new connections until it is forcibly shut down. The program must be multi-threaded and be capable of responding to multiple requests at once.