Bordcomputer/src/main/java/BordComputer.java

import device.Device;

import java.io.FileReader;
import java.lang.reflect.InvocationTargetException;
import java.util.Arrays;
import java.util.Properties;

public class BordComputer {

    String[] deviceNames;
    Device[] installedDevices;
    Device activeDevice = null;

    public void readConfig() {

        try (FileReader reader = new FileReader("Geraete.config")) {
            Properties properties = new Properties();
            properties.load(reader);
            String[] values = properties.values().toArray(new String[0]);
            Arrays.sort(values);
            deviceNames = new String[values.length];
            System.arraycopy(values, 0, deviceNames, 0, properties.size());
            installedDevices=new Device[values.length];
        } catch (Exception e) {
            e.printStackTrace();
        }
        activeDevice =installedDevices[0];
    }

    public void setDevices() throws NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException, ClassNotFoundException {
        Class<?> c;
        c= Class.forName(deviceNames[0]);
        installedDevices[0] = (Device) c.getConstructor().newInstance();
    }
}