Edited the ReadMe.md with answers to the questions.

README.md

@@ -16,39 +16,39 @@ Work through all these exercises. You edit this file with your answers for these
 	* 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?
+* What value is returned if you check the machine’s balance after it has printed a ticket? 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?
+	* Do you notice anything strange about the machine’s behavior? It always resets to 0.
+	* What happens if you insert too much money into the machine – do you receive any refund? No, you do not receive a refund.
+	* What happens if you do not insert enough and then try to print a ticket? I get the same message either way.
 
 ### Exercise 2.4
 * 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? It shows a different price and total.
 
 ### 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.
+* Write out what you think the outer wrappers of the `Student` and `LabClass` classes might look like – do not worry about the inner part. public class Student and public class LabClass respectively
 
 ### Exercise 2.7
 Does it matter whether we write<br>
 `public class TicketMachine`<br>
 or<br>
 `class public TicketMachine`<br>
-in the outer wrapper of a class?
+in the outer wrapper of a class? Yes. It would throw an error. The access level must be declared first.
 
 * 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?
-	* What error message do you get when you now press the compile button?
-	* Do you think this message clearly explains what is wrong?
+	* Do you notice a change in the class diagram? Yes. The arrow now points back to the class it starts from.
+	* What error message do you get when you now press the compile button? <identifer expected>
+	* Do you think this message clearly explains what is wrong? No.
 
 ### 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 compiled without an access level.
 
 ### 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.
@@ -62,18 +62,18 @@ in the outer wrapper of a class?
 * 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; Primitive integer
+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; alive
+private Person tutor; tutor
+private Game game; game
 ```
 ### Exercise 2.13
 
@@ -82,36 +82,36 @@ In the following field declaration from the TicketMachine class<br>
 ```java
 private int price;
 ```
-does it matter which order the three words appear in?
+does it matter which order the three words appear in? Yes.
 * 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?
-	* Check by pressing the compile button to see if there is an error message.
+possible? Yes. In the order of <access level> <name> <type> the class turned grey.
+	* Check by pressing the compile button to see if there is an error message. There is an error message stating "cannot find symbol variable price"
 	* 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.
 * 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`.
+* Write in full the declaration for a field of type `int` whose name is `status`. <access level> int status;
 
 ### Exercise 2.16
-* To what class does the following constructor belong?
+* To what class does the following constructor belong? Student
 ```
 public Student(String name)
 ```
 
 ### Exercise 2.17
-* How many parameters does the following constructor have and what are their types?
+* How many parameters does the following constructor have and what are their types? Two. Both strings.
 ```
 public Book(String title, double price)
 ```
 
 ### Exercise 2.18
-* Can you guess what types some of the `Book` class’s fields might be?
-* Can you assume anything about the names of its fields?
+* Can you guess what types some of the `Book` class’s fields might be? Strings, dates, numbers.
+* Can you assume anything about the names of its fields? Author, title, date published, ISDN
 
 READ upto and INCLUDING section 2.15 of this chapter.

bluej.pkg

@@ -1,20 +1,23 @@
 #BlueJ package file
-editor.fx.0.height=722
+dependency1.from=TicketMachineTest
+dependency1.to=TicketMachine
+dependency1.type=UsesDependency
+editor.fx.0.height=683
 editor.fx.0.width=800
-editor.fx.0.x=709
-editor.fx.0.y=113
+editor.fx.0.x=262
+editor.fx.0.y=23
 objectbench.height=101
-objectbench.width=461
+objectbench.width=776
 package.divider.horizontal=0.6
 package.divider.vertical=0.8007380073800738
 package.editor.height=427
 package.editor.width=674
-package.editor.x=1067
-package.editor.y=119
+package.editor.x=204
+package.editor.y=76
 package.frame.height=600
 package.frame.width=800
-package.numDependencies=0
-package.numTargets=1
+package.numDependencies=1
+package.numTargets=2
 package.showExtends=true
 package.showUses=true
 project.charset=UTF-8
@@ -24,9 +27,16 @@ readme.width=47
 readme.x=10
 readme.y=10
 target1.height=50
-target1.name=TicketMachine
+target1.name=TicketMachineTest
 target1.showInterface=false
-target1.type=ClassTarget
-target1.width=120
-target1.x=80
-target1.y=50
+target1.type=UnitTestTargetJunit4
+target1.width=140
+target1.x=10
+target1.y=110
+target2.height=50
+target2.name=TicketMachine
+target2.showInterface=false
+target2.type=ClassTarget
+target2.width=120
+target2.x=160
+target2.y=40

package.bluej

@@ -1,20 +1,23 @@
 #BlueJ package file
-editor.fx.0.height=722
+dependency1.from=TicketMachineTest
+dependency1.to=TicketMachine
+dependency1.type=UsesDependency
+editor.fx.0.height=683
 editor.fx.0.width=800
-editor.fx.0.x=709
-editor.fx.0.y=113
+editor.fx.0.x=262
+editor.fx.0.y=23
 objectbench.height=101
-objectbench.width=461
+objectbench.width=776
 package.divider.horizontal=0.6
 package.divider.vertical=0.8007380073800738
 package.editor.height=427
 package.editor.width=674
-package.editor.x=1067
-package.editor.y=119
+package.editor.x=204
+package.editor.y=76
 package.frame.height=600
 package.frame.width=800
-package.numDependencies=0
-package.numTargets=1
+package.numDependencies=1
+package.numTargets=2
 package.showExtends=true
 package.showUses=true
 project.charset=UTF-8
@@ -24,9 +27,16 @@ readme.width=47
 readme.x=10
 readme.y=10
 target1.height=50
-target1.name=TicketMachine
+target1.name=TicketMachineTest
 target1.showInterface=false
-target1.type=ClassTarget
-target1.width=120
-target1.x=80
-target1.y=50
+target1.type=UnitTestTargetJunit4
+target1.width=140
+target1.x=10
+target1.y=110
+target2.height=50
+target2.name=TicketMachine
+target2.showInterface=false
+target2.type=ClassTarget
+target2.width=120
+target2.x=160
+target2.y=40