import java.util.Optional;
import java.util.stream.Stream;

public class OneValue {
	public static void main(String[] args) throws Exception {
		Adress ad1 = new Adress("Minsk"  , "644", "Orlovskai");
		Adress ad2 = new Adress("Minsk"  , "643", "Pobeditelei");
		
		Stream<Adress> stream = Stream.of(ad1, ad2);
		stream.filter(adres -> adres.getPostCode().equals("643"))
		      .reduce(Optional.<Adress>empty(), (acc, element) -> acc.equals(Optional.empty()) ? Optional.of(element) : Optional.<Adress>empty(), (acc, element) -> Optional.<Adress>empty())
		      .ifPresent((value)-> {throw new RuntimeException("Some message");}   );
	}
}

class Adress{
	private final String city;
	private final String postCode;
	private final String street;
	
	Adress(String city, String postCode, String street){
		this.city = city;
		this.postCode = postCode;
		this.street = street;
	}

	public String getCity() {
		return city;
	}

	public String getPostCode() {
		return postCode;
	}

	public String getStreet() {
		return street;
	}

	@Override
	public String toString() {
		return "Adress [city=" + city + ", postCode=" + postCode + ", street=" + street + "]";
	}

}