I have two lists:
List<Flight> flightsToCity = findFlightToCity(airport);
List<Flight> flightsFromCity = findFlightFromCity(airport);
Elements of lists are flights. I must connect every flights from list flightsToCity, with every element of second list and this must be pairs. I must do this with stream and result it must be List<Pair<Flight, Flight>>
For example:
flightsToCity:
London -> Warsow,
Berlin -> Warsow
flightFromCity:
Warsow -> Barcelona,
Warsow -> Zakopane
Result:
London -> Warsow, Warsow -> Barcelona
London -> Warsow, Warsow -> Zakopane
Berlin -> Warsow, Warsow -> Barcelona
Berlin -> Warsow, Warsow -> Zakopane
Assuming that the lists have the same size and the elements are in the right order you could use an IntStream to solve your problem.
List<Pair<Flight, Flight>> flightsOfAirport = IntStream
.range(0, flightsFromCity.size())
.mapToObj(index -> Pair.of(flightsToCity.get(index), flightsFromCity.get(index)))
.collect(Collectors.toList());
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