Assignment # 1 –

Problem 22 described on page 247 of “Computing with Java”

Write a coffee vending machine class. Include fields giving the number of cups of coffee available, the cost of one cup of coffee, and the total amount of money inserted by the user. This machine requires exact change. Include one constructor which stocks the machine with a quantity and price of coffee specified as parameters, and another with no parameters which stocks the machine with 10 cups of coffee at fifty cents each. Include the following methods:

menu( )	// displays the quantity and price of coffee
insert(int quarters, int dimes, int nickels)	// inserts the given amount
select( )	// dispenses a cup of coffee if user has inserted enough // money and coffee is available, otherwise displays a // message // use return code of 1 if a cup of coffee is dispensed // use return code of 0 if a cup of coffee is not dispensed
refund( )	// returns the money inserted

Write a main method to create some vending machines and test their operations.

A sample test driver for the vending machine class is below:

// the following program should be in source file Main.java

public class Main {

public static void main (String [] args) {

int cup_of_coffee;

VendingMachine vm1 = new VendingMachine(3,65);

System.out.println(vm1);

vm1.menu();

vm1.insert(2,1,1);

cup_of_coffee = vm1.select();

if (cup_of_coffee == 0)

vm1.refund();

vm1.insert(1,1,6);

cup_of_coffee = vm1.select();

if (cup_of_coffee == 0)

vm1.refund();

vm1.insert(3,1,1);

cup_of_coffee = vm1.select();

if (cup_of_coffee == 0)

vm1.refund();

vm1.insert(1,4,0);

cup_of_coffee = vm1.select();

if (cup_of_coffee == 0)

vm1.refund();

vm1.insert(2,1,1);

cup_of_coffee = vm1.select();

if (cup_of_coffee == 0)

vm1.refund();

System.out.println(vm1);

}

}

Notes about the toString( ):

System.out.println(vm1);

Activates toString( ) to print the contents of the vending machine.

An example of program output.

Vending machine contains $0.00

0 quarters

0 dimes

0 nickels

3 cups of coffee

3 cups are available. A cup costs 65 cents.

Coffee is not dispensed unless exact change is deposited.

Coffee is not dispensed because no coffee is available.

Vending machine contains $1.95

4 quarters

6 dimes

7 nickels

0 cups of coffee

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Test your program for correctness and accuracy, prior to submitting it for grading.

Compare your program to the Program Deduction Check List to avoid penalty points.

Only send the *.java file for grading

All assignments MUST be received as email prior to the class session due date.

· Email sent to jpetlick@condor.depaul.edu

NOTE: When sending this e-mail assignment be sure to use the following header format or else the email assignment will NOT be graded:

To: jpetlick@condor.depaul.edu
Subj: 212 HW1 Your_name(s)