Creating a subclass of ArrayList<Item> for inheritance

Question

This is for a homework assignment. Basically, the idea is to create a subclass of ArrayList in the Inventory class, meaning the Inventory class will inhert from ArrayList and be able to store instances of the Item class.

So my understanding is that I would create a Inventory class and with ArrayList to connect to the Inventory?

drew moore · Accepted Answer · 2014-11-03 03:10:59Z

1

ArrayList is just a class and, as with any other (non-final) Java class, you can extend from it by using extends:

public class Inventory extends ArrayList<Item> {
    //override necessary methods here
}

edited Nov 3, 2014 at 3:10

drew moore

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answered Nov 3, 2014 at 1:38

Luiggi Mendoza

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7 Comments

user4146749 Over a year ago

So from what I am reading from your answer is that i would have to create the arraylist seperate from the inventory class or inside the class you just wrote?

Luiggi Mendoza Over a year ago

@user4146749 your question states: the Inventory class will inhert from ArrayList and be able to store instances of the Item class since you have to inherit then you will use extends. If you have a field List<Item> itemList = new ArrayList<Item>(); then you're not extending but using composition.

user4146749 Over a year ago

sorry if I am asking too much but I am just having a hard time understanding it due to the fast pace of the topic. So like this? public class Inventory extends ArrayList<Item> List<Item> itemList = new ArrayList<Item>();

Luiggi Mendoza Over a year ago

@user4146749 I guess you first define what you really have to do, review the concepts and apply the proper solution. I cannot read your mind, sorry.

Luiggi Mendoza Over a year ago

@user4146749 you should not do the both, it doesn't make any sense.

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