Text Copied below for indexing- 4 . This exercise will get you experiment the co

Question

Text Copied below for indexing-

4

.

This

exercise will get you experiment the composition relationship of

“

has

-

a

”

in OOP.

Consider the following UML conceptual model in Figure 1

and w

rite class definitions for

each of the co

ncepts.

+getCost() : int

-upc : String

-quantity : int

-price : int

OrderItem

+addOrderItem() : Boolean

+getTotal() : int

+printOrderItems()

Order

+canAfford() : Boolean

+spendAmount()

-amount : int

Account

1

*

-uses

*

1

Figure

1

Conceptual

UML

Model for Exercise 4

Account

class has an integer instance variable, amount, to represent the available fund.

The

canAfford()

method takes an integer parameter being a cost

of an order item and

returns if there is enough fund in the account to afford that. The

spendAmount()

method

takes also an integer parameter being a cost of an order item and deducts the amount by that

cost.

Order

class uses an object of

Account

class. It

should have a list of

OrderItem

objects. The

addOrderItem()

method takes an object of

OrderItem

as the parameter.

It calls the account object to check if there is enough fund to cover the cost of the order

item. If so, it invokes the

spendAmount()

on the a

ccount object, stores the order item in

a list and returns true. Otherwise, it returns false. The

getTotal()

method returns the

total cost of all order items in the order. The

printOrderItems()

method prints

information about each order item

.

OrderItem

class has a String upc, an integer quantity and an integer price. The

getCost()

method returns the multiplication of its quantity and price.

Introduce a

Homework2_4

class as a test driver. It should execute as follows:

a

.

Create an

Account

object with a random amount between 100 to 200 inclusive.

b

.

Create an

Order

object and pass t

o it the account reference.

i

.

Prompt the user to enter the UPC code for the item or “done” to quit.

ii

.

While the user enter a UPC (anything other than “done”), prompt for and

read the quantity. Yo

u may assume the user enters a valid input, that is, an

integer.

iii

.

Generate a random number from 50 to 100 for the price.

iv

.

Create an

OrderItem

object with UPC, quantity and price.

v

.

Invoke the

addOrderItem()

method on the order reference with the

order item jus

t created. If it returns false, it means there is not enough fund

in the account, so break the loop.

vi

.

Continue the loop until either user enters “done” or account can no longer

afford a new order item.

c

.

Print out all the order items and the total cost

Orderltem String int int otal0: int Figure 1 Conceptual UML Model for Exercise 4 Account class has an integer instance variable, amount, to represent the available fund. The canAfford) method takes an integer parameter being a cost of an order item and returns if there is enough fund in the account to afford that. The spendAmount ) method takes also an integer parameter being a cost of an order item and deducts the amount by that Order class uses an object of Account class. It should have a list of OrderItem objects. The addorderItem) method takes an object of OrderItem as the parameter It calls the account object to check if there is enough fund to cover the cost of the order item. If so, it invokes the spendAmount () on the account object, stores the order item in a list and returns true. Otherwise, it returns false. The getTotal () method returns the total cost of all order items in the order. The printOrderItems) method prints information about each order item OrderItem class has a String upc, an integer quantity and an integer price. The getcost () method returns the multiplication of its quantity and price. Introduce a Homework2 4 class as a test driver. It should execute as follows Create an Account object with a random amount between 100 to 200 inclusive Create an Order object and pass to it the account reference a. b. i. Prompt the user to enter the UPC code for the item or "done" to quit. ii. While the user enter a UPC (anything other than "done), prompt for and read the quantity. You may assume the user enters a valid input, that is, an iii. Generate a random number from 50 to 100 for the price. iv. Create an OrderItem object with UPC, quantity and price v. Invoke the addorderItem) method on the order reference with the order item just created. If it returns false, it means there is not enough fund in the account, so break the loop vi. Continue the loop until either user enters "done or account can no longer afford a new order item. c. Print out all the order items and the total cost.

Explanation / Answer

Please find the required program and output below :

--------------------------------------------------------------------------------

output :

Enter the UPC code for the item or 'done' to exit
asd
Enter the quantity
1
Enter the UPC code for the item or 'done' to exit
xs
Enter the quantity
2
OrderItem{upc='asd', quantity=1, price=61}
Total cost : 61

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