naiveTicketMachine (Completed Lab2)

README.md

@@ -13,72 +13,120 @@ There is 35 pages of reading and exercises in the chapter.
 Work through all these exercises. You edit this file with your answers for these exercises.
 
 ### Exercise 2.1
-* Create a TicketMachine object on the object bench.
+* Create a TicketMachine object on the object bench. 
 * Upon viewing its methods, `getBalance`, `getPrice`, `insertMoney`, `printTicket`.
 * Use `getPrice` method to view the value of the price of the tickets that was set when this object was created.
 * Use `insertMoney` method to simulate inserting an amount of money into the machine.
 * Use `getBalance` to check that the machine has a record of the amount inserted.
+
 	* You can insert several separate amounts of money into the machine, just like you might insert multiple coins or notes into a real machine. Try inserting the exact amount required for a ticket. As this is a simple machine, a ticket will not be issued automatically, so once you have inserted enough money, call the `printTicket` method. A facsimile ticket should be printed in the BlueJ terminal window.
 
 ### Exercise 2.2
 * What value is returned if you check the machine’s balance after it has printed a ticket?
 
+    * The value returned after printing the ticket ticketMa1.getBalance() returned = 0
+
 ### Exercise 2.3
 * Experiment with inserting different amounts of money before printing tickets.
-	* Do you notice anything strange about the machine’s behavior?
-	* What happens if you insert too much money into the machine – do you receive any refund?
-	* What happens if you do not insert enough and then try to print a ticket?
-
-### Exercise 2.4
+	* Do you notice anything strange about the machine’s behavior? 
+
+    * Upon printing the ticket, when checking balance it will show zero. However on the printTicket: String will show ticket price and total inserted.
+
+	* What happens if you insert too much money into the machine – do you receive any refund? 
+
+    * Similar to inserting the correct amount, Print ticket will show price and total inserted. No refund at the moment.
+
+	* What happens if you do not insert enough and then try to print a ticket? 
+
+    * String for printTicket will show the total inserted and price. Balance will reset to zero.
+
+### Exercise 2.4 - **This is where we start again**
 * Try to obtain a good understanding of a ticket machine’s behavior by interacting with it on the object bench before we start looking at how the `TicketMachine` class is implemented in the next section.
 
 ### Exercise 2.5
 * Create another ticket machine for tickets of a different price.
 	* Buy a ticket from that machine.
-	* Does the printed ticket look different?
+	* Does the printed ticket look different?  
+
+    * No, it reminds the same after duplicating the orginial TicketMachine
 
 ### Exercise 2.6
 * Write out what you think the outer wrappers of the `Student` and `LabClass` classes might look like – do not worry about the inner part.
 
 ### Exercise 2.7
 Does it matter whether we write<br>
 `public class TicketMachine`<br>
-or<br>
+or<br> 
 `class public TicketMachine`<br>
 in the outer wrapper of a class?
+    * If changed to class public TicketMachine - all the other classes must be changed to match the new class public vs. public class
 
 * Edit the source of the `TicketMachine` class to make the change and then close the editor window.
-	* Do you notice a change in the class diagram?
+	* Do you notice a change in the class diagram? 
+
+    * The appearance of red/greyed out slash marks are seen on the 'newTicketMachine' class. 
+
 	* What error message do you get when you now press the compile button?
-	* Do you think this message clearly explains what is wrong?
+
+    * The source code screen opens up, and the edited line is highlighted, bottom of the screen, an Error(s) found in class is seen.
+
+	* Do you think this message clearly explains what is wrong? 
+
+    * Yes, if you hover over the error a message appears for reasons why the error occured.
+
 
 ### Exercise 2.8
-* Check whether or not it is possible to leave out the word `public` from the outer wrapper of the `TicketMachine` class.
+* Check whether or not it is possible to leave out the word `public` from the outer wrapper of the `TicketMachine` class. 
+
+* It is possible to leave out the word 'public' from the outer wrapping. No error code created when compiled
 
 ### Exercise 2.9
 * From your earlier experimentation with the ticket machine objects within BlueJ you can probably remember the names of some of the methods – `printTicket`, for instance.
 	* Look at the class definition in Code 2.1 and use this knowledge, along with the additional information about ordering we have given you, to try to make a list of the names of the fields, constructors, and methods in the `TicketMachine` class.
+
+    * Field - private: Int price; int balance; int total; int tickeNumber
+    * Constructors - price =ticketCost, balance, total, ticketNumber
+    * Methods - return ticketNumber;
+
 	* Hint: There is only one constructor in the class.
 
 ### Exercise 2.10
 * Do you notice any features of the constructor that make it significantly different from the other methods of the class?
 
+* Constructor sets the rules for the price, balance, total, ticketNumber
+
 ### Exercise 2.11
 * What do you think is the type of each of the following fields?
 
 ```java
-private int count;
-private Student representative;
-private Server host;
+private int count; 
+
+* int
+
+private Student representative; 
+
+* Student
+
+private Server host; 
+
+* Server
 ```
 
 ### Exercise 2.12
 * What are the names of the following fields?
 
 ```java
-private boolean alive;
-private Person tutor;
-private Game game;
+private boolean alive; 
+
+* boolean alive;
+
+private Person tutor; 
+
+* Person tutor;
+
+private Game game; 
+
+* Game game
 ```
 ### Exercise 2.13
 
@@ -88,35 +136,55 @@ In the following field declaration from the TicketMachine class<br>
 private int price;
 ```
 does it matter which order the three words appear in?
+
+* Yes, Private denotes whether the field will be private to the specific class or to all the class, int is the class designator, and price is the variable.
+
 * Edit the `TicketMachine` class to try different orderings. After each change, close the editor.
 	* Does the appearance of the class diagram after each change give you a clue as to whether or not other orderings are
-possible?
+possible? 
+
+* No, Java does not care
+
 	* Check by pressing the compile button to see if there is an error message.
 	* Make sure that you reinstantiate the original version after your experiments!
 
 ### Exercise 2.14
-* Is it always necessary to have a semicolon at the end of a field declaration?
+* Is it always necessary to have a semicolon at the end of a field declaration? 
+
+* Yes, becaus a semicolon denotes in Java an end of the declaration.
+
 * Once again, experiment via the editor.
 * The rule you will learn here is an important one, so be sure to remember it.
 
 
 ### Exercise 2.15
 * Write in full the declaration for a field of type `int` whose name is `status`.
+* private int status 
 
 ### Exercise 2.16
 * To what class does the following constructor belong?
 ```
 public Student(String name)
+
+* Student class
 ```
 
 ### Exercise 2.17
 * How many parameters does the following constructor have and what are their types?
 ```
 public Book(String title, double price)
+
+* the parameteers = 2; string title and double price
+
 ```
 
 ### Exercise 2.18
 * Can you guess what types some of the `Book` class’s fields might be?
+
+* Private String Author - Private String title
+
 * Can you assume anything about the names of its fields?
+
+* it is a private and applicable to the specific scope of the class 
 
 READ upto and INCLUDING section 2.15 of this chapter.

bluej.pkg

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newTicketMachine.java

@@ -0,0 +1,100 @@
+/**
+ * newTicketMachine models a naive ticket machine that issues
+ * flat-fare tickets.
+ * The price of a ticket is specified via the constructor.
+ * It is a naive machine in the sense that it trusts its users
+ * to insert enough money before trying to print a ticket.
+ * It also assumes that users enter sensible amounts.
+ *
+ * @author David J. Barnes and Michael Kolling
+ * @version 2008.03.30
+ */
+public class newTicketMachine
+{
+    // The price of a ticket from this machine.
+    private Integer price;
+    // The amount of money entered by a customer so far.
+    private Integer balance;
+    // The total amount of money collected by this machine.
+    private Integer total;
+    // The number of tickets printed.
+    private Integer ticketNumber;
+
+    /**
+     * Create a machine that issues tickets of the given price.
+     * Note that the price must be greater than zero, and there
+     * are no checks to ensure this.
+     */
+    public newTicketMachine(Integer ticketCost)
+    {
+        price = ticketCost;
+        balance = 0;
+        total = 0;
+        ticketNumber = 0;
+    }
+
+    /**
+     * Return the price of a ticket.
+     */
+    public Integer getPrice()
+    {
+        return price;
+    }
+
+    /**
+     * Return ticketNumber.
+     * (Increments on each print.)
+     */
+    public Integer getTicketNumber()
+    {
+        return ticketNumber;
+    }
+
+
+
+    /**
+     * Return the amount of money already inserted for the
+     * next ticket.
+     */
+    public Integer getBalance()
+    {
+        return balance;
+    }
+
+    /**
+     * Receive an amount of money in cents from a customer.
+     */
+    public Integer insertMoney(Integer amount)
+    {
+        balance = balance + amount;
+        return balance;
+    }
+
+    public Integer calculateTotal(){
+        total = balance + total;
+        return total;
+    }
+
+    public Integer incrementTicketNumber(){
+        ticketNumber++;
+        return ticketNumber;
+    }
+
+
+    /**
+     * Print a ticket.
+     * Update the total collected and
+     * reduce the balance to zero.
+     */
+    public String printTicket()
+    {
+        //Increment the number of tickets printed
+        incrementTicketNumber();
+        // Update the total collected with the balance.
+        total = total + balance;
+        // Clear the balance.
+        balance = 0;
+
+        return "Ticket price: " + price + " cents. " + "Your total is " + total + ".";
+    }
+}