public class AkarmiKereso {

    public static void main(String[] args) {

        AkarmiKereso kereso = new AkarmiKereso();
        kereso.keres(Arrays.asList(new Ugy("Elso ugyem")));
    }


    public void keres(List<? extends InputAdat> minimumInput) {
        Optional<Ugy> ugyErtek = getFromList(minimumInput, Ugy.class);

        ugyErtek.ifPresent(ugy -> System.out.println(ugy.value()) );
    }

    /**
     *
     * @param minimumInput
     * @param class1
     */
    @SuppressWarnings("rawtypes")
    private <T extends InputAdat<?>> Optional<T> getFromList(List<? extends InputAdat> minimumInput, Class<? extends InputAdat> clazz) {
        for (InputAdat adat : minimumInput) {
            if (clazz.equals(adat.getClass())) {
                return Optional.of(adat);
            }
        }
        return Optional.empty();
    }



    public interface InputAdat<T>{
        T value();
    }

    public static class Ugy implements InputAdat<String>{

        private final String ugyId;

        public Ugy(String ugyId) {
            this.ugyId = ugyId;
        }

        @Override
        public String value() {
            return ugyId;
        }

    }

}