Question

Hey im making a planeManagerApp. I have a TreeMap containing Airline , HashMap(String,Plane);

I want the airline to print out planes belonging to it. So for RyanAir i want 3 planes to print out for them and for AerLingus i want 3 planes to print out for them. But when i run i get the Airline added last with all planes added.

Here is my code:

import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;


public class MainApp
{
    public static void main(String[] args)
    {
        //PlaneStore map = new PlaneStore();

        Airline a1 = new Airline("Aer Lingus");

        Plane p1 = new Plane("A01", 150.5, 10.5, 500, Plane.AIRPLANETYPE.AIRBUS);
        Plane p2 = new Plane("B01", 50.3, 1.5, 91, Plane.AIRPLANETYPE.CORPORATE);
        Plane p3 = new Plane("C01", 12.2, -3.1, 56, Plane.AIRPLANETYPE.AIRBUS);

        Airline a2 = new Airline("Brian Air");

        Plane p4 = new Plane("D01", 10.5, 1.5, 430, Plane.AIRPLANETYPE.PRIVATE);
        Plane p5 = new Plane("E01", 0.3, 2.1, 101, Plane.AIRPLANETYPE.CORPORATE);
        Plane p6 = new Plane("F01", 2.2, -3, 291, Plane.AIRPLANETYPE.AIRBUS);

        HashMap<String, Plane> airlineMap = new HashMap<String, Plane>();

        airlineMap.put(p1.getFlightNumber(), p1);
        airlineMap.put(p2.getFlightNumber(), p2);
        airlineMap.put(p3.getFlightNumber(), p3);

        airlineMap.put(p4.getFlightNumber(), p4);
        airlineMap.put(p5.getFlightNumber(), p5);
        airlineMap.put(p6.getFlightNumber(), p6);

        TreeMap<Airline, HashMap<String, Plane>> map = new TreeMap<Airline, HashMap<String, Plane>>();
        map.put(a1, airlineMap);
        map.put(a2, airlineMap);

        System.out.println("\n-------- PRINT KEY DETAILS --------");
        for(Map.Entry theEntry : map.entrySet())
            System.out.println(theEntry.getKey());

        for(Map.Entry theEntry : map.entrySet())
        {   
            HashMap<String, Plane> map2= (HashMap<String, Plane>)theEntry.getValue();

            System.out.println("\n-------- PRINT CLIENT DETAILS --------");
            for(Map.Entry theNextEntry : map2.entrySet())
                System.out.println(theNextEntry.getValue());    
        }

        //Plane p4 = new Plane("D01", 300.9, 45, 402, Plane.AIRPLANETYPE.PRIVATE);
        //Plane p5 = new Plane("E01", 455, 23, 100, Plane.AIRPLANETYPE.AIRBUS);

        //Airline.airlineMap.add("Aer Lingus", p1);



       // map.put(Airline.getAirlineName(), p1);


    }
}

Answer 1

The planes are never associated with a specific airline. You create 6 planes, give them flight numbers. Associate the flight numbers with the plane and then associate both airlines with the entire airlineMap hashmap.

map.put(a1, airlineMap);
map.put(a2, airlineMap);

This line is the only line that associates airplanes with airlines.