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http://java.sun.com/docs/books/tutorial/java/nutsandbolts/datatypes.html use .net vs 2010 data matrix drawer todraw ecc200 in .net bar code 2 . Understanding class definitions Main concepts discussed Visual Studio .NET Data Matrix ECC200 in this chapter:. fields constructors methods (accessor, mutator) parameters assignment and conditional statement. Java constructs discusse Data Matrix for .NET d in this chapter:. field, constructor, comm ent, parameter, assignment (=), block, return statement, void, compound assignment operators (+=, -=), if. In this chapter, we take gs1 datamatrix barcode for .NET our first proper look at the source code of a class. We will discuss the basic elements of class definitions: fields, constructors, and methods.

Methods contain statements and initially we look at methods containing only simple arithmetic and printing statements. Later we introduce conditional statements that allow choices between different actions to be made within methods. We will start by examining a new project in a fair amount of detail.

This project represents a na ve implementation of an automated ticket machine. As we start by introducing the most basic features of classes, we will quickly find that this implementation is deficient in a number of ways. So we will then proceed to describe a more sophisticated version of the ticket machine that represents a significant improvement.

Finally, in order to reinforce the concepts introduced in this chapter, we take a look at the internals of the lab-classes example encountered in [ 1].. Ticket machines Train stations often pro data matrix barcodes for .NET vide ticket machines that print a ticket when a customer inserts the correct money for their fare. In this chapter, we will define a class that models something like these ticket machines.

As we will be looking inside our first Java example classes, we will keep our simulation fairly simple to start with. That will give us the opportunity to ask some questions about how these models differ from the real world versions, and how we might change our classes to make the objects they create more like the real thing. Our ticket machines work by customers inserting money into them, and then requesting a ticket to be printed.

A machine keeps a running total of the amount of money it has collected throughout its operation. In real life, it is often the case that a ticket machine offers a selection of different types of ticket from which customers choose the one they want. Our simplified machines only print tickets of a single price.

. It turns out to be signi ficantly more complicated to program a class to be able to issue tickets of different values than it does to have a single price. On the other hand, with object-oriented programming it is very easy to create multiple instances of the class, each with its own price setting, to fulfill a need for different types of ticket. 2.

1.1 Exploring the behavior of a na ve ticket machine. Open the naive-ticket-ma VS .NET Data Matrix chine project in BlueJ. This project contains only one class TicketMachine that you will be able to explore in a similar way to the examples we discussed in [ 1].

When you create a TicketMachine instance, you will be asked to supply a number that corresponds to the price of tickets that will be issued by that particular machine. The price is taken to be a number of cents, so a positive whole number such as 500 would be appropriate as a value to work with. Exercises: 2-1 Create a TicketMachine object on the object bench and take a look at its methods.

You should see the following: getBalance, getPrice, insertMoney, and printTicket. Try out the getPrice method. You should see a return value containing the price of the tickets that was set when this object was created.

Use the insertMoney method to simulate inserting an amount of money into the machine and then 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. What value is returned if you check the machine s balance after it has printed a ticket 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 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. Create another ticket machine for tickets of a different price. Buy a ticket from that machine.

Does the printed ticket look different . 2-2 2-3.
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