import com.mongodb.ConnectionString;
import com.mongodb.MongoException;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;

public class App {
    public static void main(String[] args) throws Exception {
        try {
            String url = "mongodb://root:titok@localhost:27017";
                        
            ConnectionString cs = new ConnectionString(url);
            MongoClient client = MongoClients.create(cs);
            client.listDatabaseNames().forEach(System.out::println);
        } catch (MongoException e) {
            System.err.println("Hiba! A kapcsolódás sikertelen!");
            System.err.println(e.getMessage());
        }
        
    }
}