Just a random code I made up. I don't know if it has error in them as I was using Notepad++

CreateServerCode.java

public static Map<User, String> servers = new HashMap<>();
public static Map<String, Boolean> started = new HashMap<>();

public static void createServer(User user, String name)
{
    if (user == null)
    {
        return;
    }

    System.out.println("Creating a server, please wait");
    servers.put(user, name);
    System.out.println("Generating server configuration…");
    generateServerConfig(name);
    System.out.println("Configuration successfully generated\nStarting the server");
    setServerState(user, true);
}

public static void generateServerConfig(String name)
{
    // TO DO: create a code here - JSON configuration, use GSON
}

public static void setServerState(User user, Boolean state)
{
    if (user == null)
    {
    	System.out.println("Invalid user");
	return;
    }

    Boolean stated = getServerState(user);
	
    if ((stated && state == true) || (!stated && state == false))
    {
        System.out.println("Sorry, the server state is already on " + stated);
        return;
    }

    started.put(server, state);
    System.out.println("Successfully set " + server + " to " + state + " by " + user.getName());
}

public static boolean getServerState(User user)
{
    if (user == null)
    {
        System.out.println("That user is invalid!");
    }

    String server = servers.get(user);
    return started.get(server);
}