For this homework assignment, you will be writing software in support of a Dessert Shoppe which sells candy by the pound, cookies by the dozen, ice cream, and sundaes (ice cream with a topping). To do this, you will implement an inheritance hierarchy of classes derived from a DessertItem superclass.

a. The Candy, Cookie, and IceCream classes will be derived from the DessertItem class.

b. The Sundae class will be derived from the IceCream class.

DessertItem. java

public abstract class DessertItem

{

protected String name;

/ / methods

abstract double calculateAndGetCost ();

abstract String getReceiptItem ();

}

Candy. java

public class Candy extends DessertItem

{

private double weight, pricePerPound, cost;

public Candy (String name, double weight, double pricePerPound) {

this. name = name;

this. weight = weight;

this. pricePerPound = pricePerPound;

}

public double calculateAndGetCost ()

{

this. cost = Math. round ((weight * pricePerPound) * 100) / 100.0;

return this. cost;

}

public String getReceiptItem ()

{

String item = weight + " lbs. @ " + pricePerPound + " / lb./n";

item + = String. format ("%-10s/t%.2f/n", name, cost);

return item;

}

}

Cookie. java

public class Cookie extends DessertItem

{

private int number;

private double pricePerDz, cost;

public Cookie (String name, int number, double pricePerDz) {

this. name = name;

this. number = number;

this. pricePerDz = pricePerDz;

}

public double calculateAndGetCost ()

{

this. cost = Math. round ((number * pricePerDz/12) * 100) / 100.0;

return this. cost;

}

public String getReceiptItem ()

{

String item = number + " @ " + pricePerDz + " / dz./n";

item = String. format ("%-10s/t%.2f/n", name, cost);

return item;

}

}

IceCream. java

public class IceCream extends DessertItem

{

private double cost;

public IceCream (String name, double cost) {

this. name = name;

this. cost = cost;

}

public double calculateAndGetCost ()

{

return this. cost;

}

public String getReceiptItem ()

{

String item = String. format ("%-10s/t%.2f/n", name, cost);

return item;

}

}

Sundae. java

public class Sundae extends IceCream

{

private double toppingsCost, cost;

public Sundae (String name, double iceCost, double toppingsCost) {

super (name, iceCost);

this. toppingsCost = toppingsCost;

}

public double calculateAndGetCost ()

{

this. cost = super. calculateAndGetCost () + this. toppingsCost;

return this. cost;

}

public String getReceiptItem ()

{

int index = name. indexOf ("with");

String item = name. substring (0, index) + "with/n";

item + = String. format ("%-10s/t%.2f/n", name. substring (index+5), cost);

return item;

}

}