ServerMain.java

import java.util.Scanner;

public class ServerMain {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        Server server = new Server(8080);

        while(true) {

            System.out.println("1.Accept");
            System.out.println("2.Send Message");
            System.out.println("3.Close");

            int choice = sc.nextInt();
            sc.nextLine();

            switch(choice) {

                case 1:
                    server.accept();
                    new Thread(() -> server.receive()).start();
                    break;

                case 2:
                    String msg = sc.nextLine();
                    server.send(msg);
                    break;

                case 3:
                    server.close();
                    sc.close();
                    return;

            }
        }
    }
}