Add Elements from one class to an arraylist in another class

Question

Add Elements from one class to an arraylist in another class

Asked 6 years, 11 months ago

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I have a class Ticket, that creates a ticket. and I have to do a class CustomerService with a ArrayList Ticket type, which I called tickets and places all tickets created in this Arraylist.

Constructor of the Ticket class:

   public Ticket(char attendanceType, int ticketNumber)
    {
     this.arriveTime = LocalDateTime.now();
     this.attendanceTime = null;
     this.attendanceType = validateAttendanceType(attendanceType);
     this.waitTime = 0;
     this.ticketNumber = validateTicketNumber(ticketNumber);
    }

Your question is how to instantiate the ArrayList ? Or how to put the elements inside ? Has the method add of ArrayList to add elements.

– Isac

2017/12/12 at 13:50
He wants to know how to get the Arraylist of the other class, as far as I know.

– Gustavo Cinque

2017/12/12 at 13:54
Put the elements in this Ticket case, in the arraylist in the Customerservice class,

– Miguel

2017/12/12 at 14:01
ex: person creates 1,2,3,4... tickets, ticket1,ticket2.. , and the program that starts the Customerservice class, puts all these tickets in the arrayList tickets

– Miguel

2017/12/12 at 14:02
I think my answer will help you, @Miguel.

– Gustavo Cinque

2017/12/12 at 19:02

2 answers

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by Filipe Nóbrega • **101** points · Answer 1 · 2017-12-13T23:36:37+00:00

From what I understand, your question is very simple, just create a method in the class Customerservice:

public class CustomerService {

private ArrayList<Tickets> tickets;

public CustomerService(){
    this.tickets = new ArrayList<>();
}

public void addTicket(Tickets t){
    tickets.add(t);
}
}

by Gustavo Cinque • **594** points · Answer 2 · 2017-12-12T13:53:58+00:00

If you need an instance of CustomerService throughout the execution of your application, I recommend following a Singleton standard:

public class CustomerService {

    private static CustomerService INSTANCIA;

    private ArraList<Ticket> tickets;

    public static CustomerService getInstancia() {
        if (INSTANCIA == null) {
            INSTANCIA = new CustomerService();
            INSTANCIA.setTickets(new ArrayList<>());
        }

        return INSTANCIA;
    }

    public ArrayList<Ticket> getTickets() {
        return tickets;
    }

    public void setTickets(ArrayList<Ticket> tickets) {
        this.tickets = tickets;        
    }
    ...
}

From there, you need to run CustomerService.getInstancia().getTickets() to get the list of tickets and insert the object you want.