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.

Database System Concepts
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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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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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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