How would I store a list of entries after each iteration of this Java class?

Question

This class is part of a larger application that will take a number of variables from the user, and expect to use them later, even after this particular class is left.

How can I grab the data that this class takes (after multiple iterations), and call it back from a different section?

public class A8AirlineAircraftData {
public static void AddAirline(){
    Scanner sc = new Scanner(System.in);
    System.out.println("Please enter the Airline name: ");
    String airName = sc.nextLine();
    System.out.println("Please enter the Airline code: ");
    String airCode = sc.nextLine();
    System.out.println("Please enter the Delta Aircraft: ");
    String airCraft = sc.nextLine();
    System.out.println("Please enter the first class seat capacity: ");
    int firstClass = sc.nextInt();
    System.out.println("Please enter the business class seat capacity: ");
    int busiClass = sc.nextInt();
    System.out.println("Please enter the economy class seat capacity: ");
    int econClass = sc.nextInt();
    System.out.println("Airline name: " + airName);
    System.out.println("Airline code: " + airCode);
    System.out.println("Delta Aircraft: " + airCraft);
    String arr[] = airCraft.split(" ", 2);
    String firstWord = arr[0];
    System.out.println(firstWord + " first class seat capacity: " + firstClass);
    System.out.println(firstWord + " business class seat capacity: " + busiClass);
    System.out.println(firstWord + " economy class seat capacity: " + econClass);

    System.out.println( airName + " successfully added. Press Enter to continue.");
    sc.nextLine();//Press Enter to continue
    sc.nextLine();
    A8MainMenu.mainMenu(); //return to main menu after Enter. 
} //AddAirline

My output now:

Airline name: Qatar Airlines
Airline code: QA
Delta Aircraft: Boeing 787 Dreamliner
Boeing first class seat capacity: 16
Boeing business class seat capacity: 25
Boeing economy class seat capacity: 199
Qatar Airlines successfully added. Press Enter to continue.

I need to just store this information somewhere in memory until I can call it later.

Answer 1

Define a class

Create a class to represent each airplane.

Learn about constructors.

Rough code, untested…

public class Airplane {
    private String airlineName, airlineCode ;
    private Integer seatCapacityFirstClass ;

    // Constructor
    public Airplane( String airlineNameArg , String airlineCodeArg , Integer seatCapacityFirstClassArg ) {
        this.airlineName = airlineNameArg ;
        this.airlineCode = airlineCodeArg ;
        this.seatCapacityFirstClass = seatCapacityFirstClassArg ;
    }

}

Instantiate these objects after collecting input.

Airplane a = new Airplane ( "United" , "42X937" , 42 ) ;

Make a list

Put each instance of Airplane into a collection.

List<Airplane> airplanes = new ArrayList<>() ; 
airplanes.add( a ) ;

To retrieve data, add some “getter” methods to your class. Loop the list, and on each object from the list, call the getter method. For debugging, consider overriding the Object::toString method in your class to generate descriptive piece of text. All of this is covered in the Oracle Java Tutorials, and discussed in many many many Stack Overflow Questions and Answers. DuckDuckGo/Google/Bing is your friend and tutor.

Answer 2

First create a Airline class

public class Airline {
    private String name;
    private String code;

    // ..... other fields
    public Airline(String name, String code /* , .... other parameters */) {
        this.name = name;
        this.code = code;
        // .... other set fields
    }

    // getters and setters...

    // equals and hashCode...

}

Next your UI (user interface) code should

• should get a Scanner object as a parameter. Don't re-make a Scanner object based on System.in multiple times as that is a dangerous thing to do as you risk corrupting the System.in if you close this object early. Make it once and use it throughout.
• The method should create and return an Airline object,
• This method should have one responsibility and that is to get data from the user and use it to create an Airline object, nothing less and nothing more. It should not make calls to show the menu, otherwise known as "side effects" -- that's the calling code's responsibility, meaning the code that calls this method will then get the Airline object from the method, and the calling code will decide what should next be done.

e.g.,

// use a Scanner parameter
public static Airline AddAirline(Scanner sc) {
    // don't re-create the Scanner object
    // Scanner sc = new Scanner(System.in);
    System.out.println("Please enter the Airline name: ");
    String airName = sc.nextLine();
    System.out.println("Please enter the Airline code: ");
    String airCode = sc.nextLine();

    // ..... other code

    // create your Airline object
    Airline airline = new Airline(airName, airCode); // plus other parameters in the complete class
    return airline;  // and return it

    // !! the code below should be part of the calling code
    // System.out.println(airName + " successfully added. Press Enter to continue.");
    // sc.nextLine();// Press Enter to continue
    // sc.nextLine();
    // !! A8MainMenu.mainMenu(); // NO!! Don't do this
}