BlueJ - The Ticket Machine

The Ticket Machine

Download: The Ticket Machine

Review: The Ticket Machine Presentation

Introductory Assignment

Exercise 1

In BlueJ

• 1. Open project: The Ticket Machine

  2. In BlueJ menu:

     1. • Click View

• • • Check Show Terminal.

• 3. In Terminal Window:

     1. • Click Options

• • • Check Record method calls.

• 4. Create an instance of the class using TicketMachine(ticketCost) constructor.

• • • Supply an int parameter for the ticketCost in cents for $1.00.

• 5. Complete Exercise 2.1-2.4 on page 18 of the text.

• • 1. Exercise 2.1

       1. Try the getPrice method.

          1. • What does it do?

• • • • • What is the return class?

• • 1. 2. Insert some money and check the balance using methods:

          1. • insertMoney

• • • • • getBalance

• • 1. 3. Inspect the object.

       4. Insert more money that a ticket costs.

    2. Call method printTicket.

    3. Exercise 2.2

• • • • Check the balance.

      • What is the balance after printTicket method is called?

• • • Is that reasonable?

• • 1. Exercise 2.3

       • Experiment by inserting different amounts of money before calling printTicket method.

       • What is the balance after printTicket method is called?

• • • What must happen to balance field in printTicket method?

• • 1. Exercise 2.4

• • • Experiment with the TicketMachine class before we examine in in detail.

    • Create another TicketMachine object with a different ticket price.

    • Buy and print a ticket.

    • Does the ticket look much the same?

• • Is that reasonable behavior? Why?

Sample Ticket Machine Code is available here. Do not copy & paste - type it in manually.

Assignment 1

Read: Objects First with Java - Chapter 2 (Pages 17-25)

Complete: Exercises 2.7 - 2.15 (pages 22-25)

Assignment 2

Read: Objects First with Java - Chapter 2 (Pages 26-32)

Complete: Exercises 2.16 - 2.20 (pages 27-28)

Good luck everyone!

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