Write java for Invoice and TestInvoice

Question

I have the first file for invoice no problem, I am unsure how to write TestInvoice

 

Invoice

 

import java.util.Scanner;

public class Invoice
{
private String partNumber;
private String partDescription;
private int quantity;
private double pricePerItem;

// four-argument constructor
public Invoice( String part, String description, int count,
double price )
{
partNumber = part;
partDescription = description;
setQuantity( count ); // validate and store quantity
setPricePerItem( price ); // validate and store price per item
} // end four-argument Invoice constructor

// set part number
public void setPartNumber( String part )
{
partNumber = part;
} // end method setPartNumber

// get part number
public String getPartNumber()
{
return partNumber;
} // end method getPartNumber

// set description
public void setPartDescription( String description )
{
partDescription = description;
} // end method setPartDescription

// get description
public String getPartDescription()
{
return partDescription;
} // end method getPartDescription

// set quantity
public void setQuantity( int count )
{
quantity = ( count < 0 ) ? 0 : count; // quantity cannot be negative
} // end method setQuantity

// get quantity
public int getQuantity()
{
return quantity;
} // end method getQuantity

// set price per item
public void setPricePerItem( double price )
{
pricePerItem = ( price < 0.0 ) ? 0.0 : price; // validate price
} // end method setPricePerItem

// get price per item
public double getPricePerItem()
{
return pricePerItem;
} // end method getPricePerItem

// return String representation of Invoice object
public String toString()
{
return String.format( "%s: \n%s: %s (%s) \n%s: %d \n%s: $%,.2f",
"invoice", "part number", getPartNumber(), getPartDescription(),
"quantity", getQuantity(), "price per item", getPricePerItem() );
} // end method toString

// method required to carry out contract with interface Payable
public double getPaymentAmount()
{
return getQuantity() * getPricePerItem(); // calculate total cost
} // end method getPaymentAmount
} // end class Invoice

 

 

TestInvoice

 

public class TestInvoice
{
public static void main(String[]args)
{
Invoice aToy = new Invoice("part number is 21945", "part is black with white dots" ,


}
}

Answer 1

Here is one Test Invoice test I have made for you. But if you are using JUnit or Mockito it would be a bit different. Feel free to reach out if you have questions.

public class TestInvoice {

public static void main(String[] args) {

// Create an Invoice object

Invoice aToy = new Invoice("21945", "Toy - Black with white dots", 3, 12.99);

// Print invoice details using toString

System.out.println(aToy.toString());

// Display the total payment amount

System.out.printf("Total payment due: $%.2f%n", aToy.getPaymentAmount());

}

}