Adding default values in ArrayList

Question

I have a product with following format:

public Item(String barcode, double price, int inStock) {
    if (barcode == null) {
        barcode = "";
    }
    if (price < 0) {
        price = 0;
    }
    if (inStock < 0) {
        inStock = 0;
    }
    this.barcode = barcode;
    this.price = price;
    this.inStock = inStock;
}

And an ArrayList to store the items in another class:

public class Inventory {
    private ArrayList<Item> currentInventory;

    public Inventory() {
        this.currentInventory = new ArrayList<Inventory>();
    }

    /**
     * Adds default products to the inventory
     */
    public void inventoryDefault() {    
        this.currentInventory("JMS343", 100.00, 5);
        this.currentInventory("RQ090", 50.00, 20);  
    }

I cannot figure out how to add 2 items as defaults, or always in the currentInventory, until removed by the user. I have also tried:

public void inventoryDefault() {    
    this.currentInventory.add(JMS343, 100.00, 5);
    this.currentInventory.add(RQ090, 50.00, 20);    
}

This, however, shows an error that JMS343 and RQ090 cannot be resolved to variables. I thought I was creating them at this point, since it is just a String. Any help would be great. Thanks!

Working solution as shown below:

        public void inventoryDefault() {    
            this.currentInventory.add(new Item("JMS343", 100.00, 5));
            this.currentInventory.add(new Item("RQ090", 50.00, 20));    
        }

I did the double quotes in my first try. Tried it with and without and showed that in my examples. — comfycozy
– comfycozy, Commented Dec 5, 2015 at 18:45
Forgive me if I'm wrong, but isn't the constructor for Items the "public Items(x, x, x)" at the beginning of the example? — comfycozy
– comfycozy, Commented Dec 5, 2015 at 18:46

Yazan · Accepted Answer · 2015-12-05 18:39:51Z

2

do this to the constructor of the Inventory class

public Inventory() {
        this.currentInventory = new ArrayList<Inventory>();
        this.currentInventory.add(new Item("JMS343", 100.00, 5));
        this.currentInventory.add(new Item("RQ090", 50.00, 20);
    }

answered Dec 5, 2015 at 18:39

Yazan

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1 Comment

comfycozy Over a year ago

This worked exactly as asked for! I added it to my code above. Will accept as answer when it allows me to.

Manos Nikolaidis · Accepted Answer · 2015-12-05 18:43:47Z

2

You need to construct Item objects with the constructor to add them to the ArrayList. E.g.

public void inventoryDefault() {    
    currentInventory.add(new Item("JMS343", 100.00, 5);
    currentInventory.add(new Item("RQ090", 50.00, 20);
}

Or add an appropriate function to Inventory that may also be useful otherwise :

public void addItem(String barcode, double price, int inStock) {
    Item item = new Item(barcode, price, inStock);
    currentInventory.add(item);
}

public void inventoryDefault() {    
    addItem("JMS343", 100.00, 5);
    addItem("RQ090", 50.00, 20);
}

answered Dec 5, 2015 at 18:43

Manos Nikolaidis

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