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EN

class Server implements Runnable {
    @Override
    public void run() {
        //your server starting logic here
    }
}

class Client implements Runnable {

    @Override
    public void run() {
        //your client starting logic here
    }
}

public static void main(String args[]) throws InterruptedException {
    Server server = new Server();
    Client client = new Client();

    Thread tServer = new Thread(server);
    tServer.start();

    //here you can wait some time to Server started

    Thread tClient = new Thread(client);
    tClient.start();
}