Cannot find symbol method getPrice()?

[EDale]

Hey guys,
So I have 3 constructor classes and a main method. The three constructors are Product, LineItem, and Invoice. The main method is Cashier. In class Invoice, I'm trying to create a method called getRunningTotal() that scans through all the positions in the array and returns it's price and quantity. This is my method.

    public double getRunningTotal() {
        double runningTotal=0;
        for(int i=0; i<numItems; i++) {
            runningTotal=runningTotal+collection[i].getPrice()*collection[i].getQuantity();
        }
        return runningTotal;
    }

The method getPrice() is declared in the Product class, and getQuantity() is in my LineItem class.. What do I have to do to make Invoice recognize those methods?

[Norm]

collection[i].getPrice()
and
method getPrice() is declared in the Product class

The array: collection must be defined as an array of Product objects. collection[i] is must be a Product object.

[EDale]

Fixed it! I realized I had a method in LineItem that already multiplied price andd quantity so I called that one instead since I was directed that my collection should be a collection of LineItems not Products. Here is what I did:

    public double getRunningTotal() {
        double runningTotal=0;
        for(int i=0; i<numItems; i++) {
            runningTotal=runningTotal+collection[i].getAmount();
        }
        return runningTotal;
    }

I just have one last method to correct if you could bare with me I would appreciate it. I have a method called update(java.lang.String name, int quantity) which updates the quantity for a line item. This method searches through the collection and finds the one that has the same name as the parameter. It then sets the quantity of that product to the parameter value. If the quantity is 0, the LineItem is removed from the collection and count is adjusted accordingly (this is achieved by calling a private method removeFromInvoice that takes the paramter name). If there is no LineItem with a name that matches the parameter name, this method has no effect.

Does this mean I have to create a method removeFromInvoice within the Invoice class? It takes the name as a parameter, but this is giving me the same problem as getRunningTotal() was.

[Norm]

I have a method called update(java.lang.String name, int quantity) which ...

Does this mean I have to create a method

First quote says "I have...". The second asks about creating a method. I'm confused.

You need to look at the classes and where the data is that is to be updated and have the method located where it will have access to the data that is to be changed.

[EDale]

I apologize. I don't have the method update(java.lang.String name, int quantity) finished. The description says the update method called a private removeFromInvoice method if the updated quantity entered is 0. The remove method takes the parameter name, so it looks like I only have access to the parameter name in the LineItem class. So I put the removeFromInvoice method in the LineItem class?

Here is the removeFromInvoice method I created:

    public boolean removeFromInvoice(java.lang.String name) {
        for(int i=0; i<numItems; i++) {
            if(collection[i].getName().toUpperCase().equals(name.toUpperCase())) {
                collection[i]=collection[numItems-1];
                numItems--;
                return true;
            }
                else return false;
            }
            return false;
        }

it gives me an error when I put it in the Invoice class, it says cannot find symbol method getName() again.

This is what I have so far for the update method:

    public void update(java.lang.String name, int quantity) {
        for (int i=0; i<numItems; i++) {
            if(collection[i].getProduct().toUpperCase().equals(p.toUpperCase())) {
 
            }
        }
    }

I am told this method goes in the Invoice class, but it has a name parameter again. I'm not sure what to do from here.

[Norm]

I'd work on one problem at a time. Trying to do more will be confusing.

cannot find symbol method getName()

When you call a method that belongs to a class, you must have a reference to an instance of that class.
What data type/class is collection[i]? Does that class has a method: getName()? You can not call a method that is not in the class. What class is getName() defined in? Where is there a reference to an instance of that class?