Task

import java.io.RandomAccessFile;
import java.net.InetSocketAddress;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Random;

public class Practicum {
    private static final int PORT = 8080;
    private static Random rnd = new Random();

    // IOException могут сгенерировать методы create() и bind(...)
    public static void main(String[] args) throws IOException {
        HttpServer httpServer = HttpServer.create();

        httpServer.bind(new InetSocketAddress(PORT), 0);
        httpServer.createContext("/hello", new HelloHandler());
        httpServer.createContext("/day", new MyHelloHandle());
        httpServer.start(); // запускаем сервер

        System.out.println("HTTP-сервер запущен на " + PORT + " порту!");
        httpServer.stop(1);
    }

    static class HelloHandler implements HttpHandler {
        @Override
        public void handle(HttpExchange httpExchange) throws IOException {
            System.out.println("Началась обработка /hello запроса от клиента.");

            String response = "Hey! Glad to see you on our server.";
            httpExchange.sendResponseHeaders(200, 0);

            try (OutputStream os = httpExchange.getResponseBody()) {
                os.write(response.getBytes());
            }
        }
    }

    static class MyHelloHandle implements HttpHandler {
        @Override
        public void handle(HttpExchange exchange) throws IOException {
            System.out.println("Началась обработка /day запроса от клиента.");

            String[] days = new String[]{"MON", "TUE", "WED", "THU", "FRI", "SAT", "SUN"};
            int index = rnd.nextInt(7);
            String response = days[index];
            exchange.sendResponseHeaders(200, 0);

            try (OutputStream os = exchange.getResponseBody()) {
                os.write(response.getBytes());
            }
        }
    }
}