How to return an arraylist iterator? (Java)

Question

I'm new in java programming. I have searched several posts that related to iterator but still cannot figure out how to do it.

I have 2 classes. Order and OrderItem. I need to implement the interface Iterable<OrderItem> to being able to iterate through the items using the for-each loop.

public class OrderItem {
    private Product product;
    private int quantity;

    public OrderItem(Product initialProduct, int initialQuantity)
    {
        this.product = initialProduct;
        this.quantity = initialQuantity;
    }
    public Product getProduct()
    {
        return this.product;
    }

    public int getQuantity()
    {
        return this.quantity;
    }

This is the class Order

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class Order implements Iterable<OrderItem> {

private List<OrderItem> items = new ArrayList<OrderItem>();

    public Order()
    {
    }

    public void addItem(OrderItem orderitem)
    {
        items.add(orderitem);
    }

    public Iterator<OrderItem> iterator()
    {
        return this.iterator(); //How to do this part??
    }

    public int getNumberOfItems()
    {
        return items.size();
    }
    }

Here What does it mean to return an iterator? Java suggests doing it like what i learn about linked list. But i am using ArrayList now. I don't need to do like this? Or do I?

Oops... I made a stupid mistake. It seems fine when i changed items.iterator(). Thank you for helping! — Wai
– Wai, Commented Jun 19, 2016 at 18:36

ΦXocę 웃 Пepeúpa ツ · Accepted Answer · 2016-06-19 18:34:59Z

1

You can take the iterator from the List of OrdemItem here:

private List<OrderItem> items = new ArrayList<OrderItem>();

and do:

public Iterator<OrderItem> iterator()
{
    return items.iterator();  
}

instead of doing

public Iterator<OrderItem> iterator()
{
    return this.iterator(); //How to do this part??
}

answered Jun 19, 2016 at 18:34

ΦXocę 웃 Пepeúpa ツ

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