Socket in java

public class GreetServer {
    private ServerSocket serverSocket;
    private Socket clientSocket;
    private PrintWriter out;
    private BufferedReader in;

    public void start(int port) {
        serverSocket = new ServerSocket(port);
        clientSocket = serverSocket.accept();
        out = new PrintWriter(clientSocket.getOutputStream(), true);
        in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
        String greeting = in.readLine();
            if ("hello server".equals(greeting)) {
                out.println("hello client");
            }
            else {
                out.println("unrecognised greeting");
            }
    }

    public void stop() {
        in.close();
        out.close();
        clientSocket.close();
        serverSocket.close();
    }
    public static void main(String[] args) {
        GreetServer server=new GreetServer();
        server.start(6666);
    }
}

Source: baeldung.com

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