public class Check_services implements Runnable{
List<Service> services;
boolean running=true;
public Check_services(List services)
{
    this.services = services;
}

@Override
public void run()
{
    while(running)
    {
        for(Service s : services)
        {
            if(!s.portIsOpen())
            {
                // fire Telegram Message
            }
        }
        try
        {
            Thread.sleep(10000);
        }
        catch (InterruptedException ex)
        {
            System.out.println("Error speep @ Check_services.class");
            ex.printStackTrace();
        }
    }
}

public void startCheck()
{
    checking = new Thread(new Check_services(services));
    checking.start();
}

public void stopCheck() throws InterruptedException
{
    if (!checking.isInterrupted())
    {
        checking.interrupt();
        checking.join();
    }
}