Answered: Enhance the invoice-printing program by…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Using Java.

Enhance the invoice-printing program by providing for two kinds of line items: One kind describes products that are purchased in certain numerical quantities (such as “3 toasters”), another describes a fixed charge (such as “shipping: $5.00”). Hint: Use inheritance.

I've seen this question asked before, however, the code is very confusing to me.

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Follow-up Question

This implementation makes so much more sense, however, the LineItem class I have to go off of is a tad bit different. How would it look given the following?

public class LineItem {

privateint quantity;

private Product theProduct;

/**

@param aProduct the product

@param aQuantity the item quantity

public LineItem(Product aProduct,int aQuantity){

theProduct = aProduct;

quantity = aQuantity;

}

/**

* @return the total price

publicdouble getTotalPrice(){

return theProduct.getPrice() * quantity;

}

/**

@return a formatted string of this item

public String format(){

return String.format("%-30s%8.2f%5d%8.2f", theProduct.getDescription(), theProduct.getPrice(), quantity, getTotalPrice());

}

public class LineItem {

privateint quantity;

private Product theProduct;

/**

@param aProduct the product

@param aQuantity the item quantity

public LineItem(Product aProduct,int aQuantity){

theProduct = aProduct;

quantity = aQuantity;

}

/**

* @return the total price

publicdouble getTotalPrice(){

return theProduct.getPrice() * quantity;

}

/**

@return a formatted string of this item

public String format(){

return String.format("%-30s%8.2f%5d%8.2f", theProduct.getDescription(), theProduct.getPrice(), quantity, getTotalPrice());

}

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