Lab 7

import java.util.ArrayList;


public class InvoiceTest {

    public static void main(String[] args) {

        ArrayList<Invoice> invoices = new ArrayList<Invoice>();

        Invoice invoice1, invoice2;

        invoice1 = new Invoice("1234","Hammer",2,14.95);
        invoice2 = new Invoice("5678","Paint Brush",-5,-9.99);

        invoices.add(invoice1);
        invoices.add(invoice2);

        for(Invoice n: invoices){
            n.getInvoiceAmount();
            System.out.println(n);
        }

        invoice1.setNumber("001234");
        invoice1.setDescription("Yellow Hammer");
        invoice1.setQuantity(3);
        invoice1.setPrice(19.49);

        invoice2.setQuantity(3);
        invoice2.setPrice(9.49);

        for(Invoice n: invoices){
            n.getInvoiceAmount();
            System.out.println(n);
        }
    }

}

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public class Invoice {

    private String number;
    private String description;
    private int quantity;
    private double price;
    private double invoiceTotal;

    public Invoice(){

        number = "";
        description = "";
        quantity = 0;
        price = 0;
    }

    public Invoice(String n, String d, int q, double p) {

        number = n;
        description = d;
        quantity = q;
        price = p;
    }

    public String getNumber(){
        return number;
    }

    public void setNumber(String n){
        number = n;
    }

    public String getDescription(){
        return description;
    }

    public void setDescription(String d){
        description = d;
    }

    public int getQuantity(){
        return quantity;
    }

    public void setQuantity(int q){
        quantity = q;
    }

    public double getPrice(){
        return price;
    }

    public void setPrice(double p){
        price = p;
    }

    public double getInvoiceAmount(){

        if(quantity < 0){
            quantity = 0;
        }

        if(price < 0) {
            price = 0.0;
        }

        invoiceTotal = quantity * price;

        return invoiceTotal;
    }

    @Override
    public String toString(){
        return String.format(
                "Invoice with number %s is %s with quantity %d at %f each. costs a total of %f.\n",
                number, description, quantity, price, invoiceTotal);
    }

}