I have done the assignment

README.md

@@ -14,31 +14,39 @@ Work through all these exercises. You edit this file with your answers for these
 
 ### Exercise 2.1
 * Create a TicketMachine object on the object bench.
+Already done.
 * Upon viewing its methods, `getBalance`, `getPrice`, `insertMoney`, `printTicket`.
+I did.
 * 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?
+* What value is returned if you check the machine’s balance after it has printed a ticket? 
+The result value was 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?
+Nothing strange at the moment.
+	* What happens if you insert too much money into the machine – do you receive any refund? The balance takes into account that level of money. No refund.
 	* What happens if you do not insert enough and then try to print a ticket?
+I can not insert 10 cent. It does not print a ticket.
 
 ### 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.
+I did it.
 
 ### 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?
+No difference in the look, but the price is different.
 
 ### 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.
+The Student and LabClass will be public class, with inside the curly brackets the inner part.
 
 ### Exercise 2.7
 Does it matter whether we write<br>
@@ -47,38 +55,53 @@ or<br>
 `class public TicketMachine`<br>
 in the outer wrapper of a class?
 
+It is not the same as we need to write correctly as public class TicketMachine. The second form is incorrect.
+
 * 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 diagram changed with some multiples brown squares.
 	* What error message do you get when you now press the compile button?
+The erro is : "Identifier expected."
 	* Do you think this message clearly explains what is wrong?
+Yes.
 
 ### Exercise 2.8
 * Check whether or not it is possible to leave out the word `public` from the outer wrapper of the `TicketMachine` class.
+It is not possible.
 
 ### 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.
 	* Hint: There is only one constructor in the class.
+TicketMachine is the constructor
+Balance, total and price , are some fields, while getBalance, insert money, printTickets and getPrice are examples of methods.
 
 ### Exercise 2.10
 * Do you notice any features of the constructor that make it significantly different from the other methods of the class?
+The difference is that the constructor does not return values, while methods do.
 
 ### Exercise 2.11
 * What do you think is the type of each of the following fields?
 
 ```java
 private int count;
+It is an integer.
 private Student representative;
+It is a Student.
 private Server host;
+It is a Server.
 ```
 
 ### Exercise 2.12
 * What are the names of the following fields?
 
 ```java
 private boolean alive;
+Name : alive.
 private Person tutor;
+Name : tutor.
 private Game game;
+Name : game.
 ```
 ### Exercise 2.13
 
@@ -88,35 +111,52 @@ In the following field declaration from the TicketMachine class<br>
 private int price;
 ```
 does it matter which order the three words appear in?
+Yes, it matters.
 * 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.
+There is an error message.
+
 	* Make sure that you reinstantiate the original version after your experiments!
+Done.
+
 
 ### Exercise 2.14
 * Is it always necessary to have a semicolon at the end of a field declaration?
+Yes.
 * Once again, experiment via the editor.
+Done.
+
 * The rule you will learn here is an important one, so be sure to remember it.
+Ok.
 
 
 ### 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)
+
+The class is student.
 ```
 
 ### Exercise 2.17
 * How many parameters does the following constructor have and what are their types?
 ```
 public Book(String title, double price)
+This constructor has 2 parameters.The first one is a string, while the second one is a double.
 ```
 
 ### Exercise 2.18
 * Can you guess what types some of the `Book` class’s fields might be?
+A title can be a string, while the price of the book is a double.
 * Can you assume anything about the names of its fields?
+No.
 
 READ upto and INCLUDING section 2.15 of this chapter.

TicketMachine.java

@@ -9,7 +9,7 @@
  * @author David J. Barnes and Michael Kolling
  * @version 2008.03.30
  */
-public class TicketMachine
+public  class TicketMachine
 {
     // The price of a ticket from this machine.
     private Integer price;