Answered Essay: Create a class called Invoice that a hardware store might use to represent an invoice for an item sold at the store. A

Create a class called Invoice that a hardware store might use to represent an invoice for an item sold at the store. An Invoice should include four pieces of information as instance variables – a part number (type string), a part description

(type string), a quantity of the item being purchased (type int) and a price per item (decimal).

Your class should have a constructor that initializes the four variables. Provide a method named GetInvoiceAmount that calculates the invoice amount (i.e.,

multiplies the quantity by the price per item), then returns the amount as a decimal value.

Write a class named InvoiceTest that demonstrates class Invoice’s capabilities. That is, creating an instance of Invoice by calling its constructor and then call its method GetInvoiceAmount.

These two classes are in the same namespace

Expert Answer


Executable Code :

package syemmetric;

public class InvoiceTest {

public static void main(String[] args) {

Invoice inv = new Invoice(“HD_1001”, “Hard Disk”, 23, 320);

System.out.println(“Part Number. ” + inv.getPartNumber());

System.out.println(“Description:” + inv.getPartDescription());

System.out.println(“Quantity: ” + inv.getQuantity());

System.out.println(“ltem Price: $” + inv.getPricePerItem());

System.out.println(“lnvoice Amount: $” + inv.getlnvoiceAmount());



package syemmetric;

public class Invoice {

private String partNumber;

private String partDescription;

private int quantity;

private double pricePerItem;

public Invoice(String aPartNumber, String aParlDescription, int aQuantity, double aPricePerItem)







public String getPartNumber() {

return partNumber;


public void setPartNumber(String aPartNumber)


partNumber = aPartNumber;


public String getPartDescription()


return partDescription;


public void setPartDescription(String aPartDescription) {

partDescription = aPartDescription;


public int getQuantity()


return quantity;


public void setQuantity(int aQuantity)


if (aQuantity > 0)

quantity = aQuantity;


quantity = 0;


public double getPricePerItem() {

return pricePerItem;


public void setPricePerltem(double aPricePerltem) {

if (aPricePerltem > 0)

pricePerItem = aPricePerltem;


pricePerItem = 0.0;


public double getlnvoiceAmount()


return quantity * pricePerItem;



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