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README.md

@@ -18,28 +18,34 @@ required for a ticket. As this is a simple machine, a ticket will not be issued
 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?
+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?
+tickets. Do you notice anything strange about the machine’s behavior?
+It doesn't calculate change
+ What happens
+if you insert too much money into the machine – do you receive any refund? No What
+happens if you do not insert enough and then try to print a ticket? It prints the ticket regardless
 * 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?
+ticket from that machine. Does the printed ticket look different? only ticket price
 
 * 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.
+
+Public class Student () {}
+Public class LabClass() {}
+
 * Exercise 2.7 Does it matter whether we write
 `public class TicketMachine`
 or
 `class public TicketMachine`
 in the outer wrapper of a 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?
+class diagram? Yes, the class shows a square pattern
 What error message do you get when you now press the Compile button? Do you think
-this message clearly explains what is wrong?
+this message clearly explains what is wrong? Identifier expected, yes, it expected an identifier before the name of the class
 * Exercise 2.8 Check whether or not it is possible to leave out the word public
 from the outer wrapper of the TicketMachine class.
 
@@ -49,44 +55,65 @@ 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.
+
+Fields : price, balance, total
+Constructor : Ticketmachine (ticket cost)
+Methods : getPrice, getBalance, insertMoney, printTicket
+
+
 Exercise 2.10 Do you notice any features of the constructor that make it significantly
 different from the other methods of the class?
 
+it doesn't have a return type in front of the constructor name
+
 * Exercise 2.11 What do you think is the type of each of the following fields?
 ```
-private int count;
-private Student representative;
-private Server host;
+private int count; integer
+private Student representative; object
+private Server host; object
 ```
 * Exercise 2.12 What are the names of the following fields?
 ```
-private boolean alive;
-private Person tutor;
-private Game game;
+private boolean alive; alive
+private Person tutor; tutor
+private Game game; game
 ```
 * Exercise 2.13 In the following field declaration from the TicketMachine class
 ```
 private int price;
 ```
-does it matter which order the three words appear in? Edit the TicketMachine class to
+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, only the original order works, the class diagram shows a chequered pattern and throws an error otherwise
+ Check by pressing the Compile button to see if there is an error message.
 Make sure that you reinstate the original version after your experiments!
 * Exercise 2.14 Is it always necessary to have a semicolon at the end of a field declaration?
+
+yes, because it identifies the statement as a complete java statement
+
 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.
-* Exercise 2.16 To what class does the following constructor belong?
+
+int status;
+
+* Exercise 2.16 To what class does the following constructor belong? Student because a constructor has the same name as the class in which they are defined
 ```
 public Student(String name)
 ```
-* Exercise 2.17 How many parameters does the following constructor have and what are their types?
+* Exercise 2.17 How many parameters does the following constructor have and what are their types? 2, title of type String and price of type double
 ```
 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?
 
+yes, there might be a field Material of type string, to distinguish between paperback, softcover or kindle
+another field Condition of type String could contain whether the book was used or new, available for sale or rental
+
+
+
 Work all Exercises from 2.19 to 2.58 that are NOT marked *Challenge exercise*.
-READ upto and INCLUDING section 2.15 of this chapter.
+READ upto and INCLUDING section 2.15 of this chapter.