Kr Younger 6 anni fa
parent
commit
6f18bc5155
7 ha cambiato i file con 139 aggiunte e 1 eliminazioni
  1. BIN
      .DS_Store
  2. 14
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      README.TXT
  3. 3
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      README.md
  4. 78
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      TicketMachine.java
  5. 24
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      bluej.pkg
  6. 20
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      bluej.pkh
  7. BIN
      doc/BlueJ-objects-first-ch2.pdf

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.DS_Store Vedi File


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README.TXT Vedi File

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+Project: naive-ticket-machine
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+Authors: David Barnes and Michael Kolling
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+
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+This project is part of the material for the book
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+
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+   Objects First with Java - A Practical Introduction using BlueJ
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+   Fourth edition
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+   David J. Barnes and Michael Kolling
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+   Pearson Education, 2008
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+
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+It is discussed in chapter 2.
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+
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+Purpose of project: To illustrate the basics of fields, constructors, and methods.
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+How to start this project: Create one or more TicketMachine objects.

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README.md Vedi File

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 # NaiveTicket
2 2
 
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-the second Objects lab.
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+the second Objects lab.
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+
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+look for the Chapter reading you need in the doc folder.

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TicketMachine.java Vedi File

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+/**
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+ * TicketMachine models a naive ticket machine that issues
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+ * flat-fare tickets.
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+ * The price of a ticket is specified via the constructor.
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+ * It is a naive machine in the sense that it trusts its users
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+ * to insert enough money before trying to print a ticket.
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+ * It also assumes that users enter sensible amounts.
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+ *
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+ * @author David J. Barnes and Michael Kolling
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+ * @version 2008.03.30
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+ */
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+public class TicketMachine
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+{
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+    // The price of a ticket from this machine.
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+    private int price;
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+    // The amount of money entered by a customer so far.
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+    private int balance;
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+    // The total amount of money collected by this machine.
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+    private int total;
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+
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+    /**
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+     * Create a machine that issues tickets of the given price.
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+     * Note that the price must be greater than zero, and there
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+     * are no checks to ensure this.
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+     */
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+    public TicketMachine(int ticketCost)
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+    {
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+        price = ticketCost;
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+        balance = 0;
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+        total = 0;
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+    }
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+
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+    /**
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+     * Return the price of a ticket.
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+     */
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+    public int getPrice()
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+    {
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+        return price;
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+    }
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+
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+    /**
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+     * Return the amount of money already inserted for the
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+     * next ticket.
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+     */
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+    public int getBalance()
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+    {
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+        return balance;
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+    }
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+
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+    /**
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+     * Receive an amount of money in cents from a customer.
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+     */
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+    public void insertMoney(int amount)
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+    {
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+        balance = balance + amount;
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+    }
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+
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+    /**
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+     * Print a ticket.
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+     * Update the total collected and
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+     * reduce the balance to zero.
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+     */
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+    public void printTicket()
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+    {
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+        // Simulate the printing of a ticket.
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+        System.out.println("##################");
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+        System.out.println("# The BlueJ Line");
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+        System.out.println("# Ticket");
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+        System.out.println("# " + price + " cents.");
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+        System.out.println("##################");
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+        System.out.println();
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+
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+        // Update the total collected with the balance.
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+        total = total + balance;
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+        // Clear the balance.
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+        balance = 0;
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+    }
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+}

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bluej.pkg Vedi File

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+#BlueJ package file
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+package.editor.height=275
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+package.editor.width=400
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+package.editor.x=420
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+package.editor.y=175
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+package.numDependencies=0
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+package.numTargets=1
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+package.showExtends=true
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+package.showUses=true
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+readme.editor.height=487
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+readme.editor.width=610
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+readme.editor.x=0
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+readme.editor.y=22
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+target1.editor.height=735
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+target1.editor.width=648
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+target1.editor.x=50
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+target1.editor.y=60
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+target1.height=50
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+target1.name=TicketMachine
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+target1.showInterface=false
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+target1.type=ClassTarget
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+target1.width=110
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+target1.x=80
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+target1.y=50

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bluej.pkh Vedi File

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+#BlueJ package file
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+package.editor.height=286
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+package.editor.width=408
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+package.editor.x=419
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+package.editor.y=319
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+package.numDependencies=0
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+package.numTargets=1
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+package.showExtends=true
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+package.showUses=true
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+target1.editor.height=735
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+target1.editor.width=648
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+target1.editor.x=50
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+target1.editor.y=60
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+target1.height=50
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+target1.name=TicketMachine
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+target1.showInterface=false
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+target1.type=ClassTarget
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+target1.width=110
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+target1.x=80
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+target1.y=50

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doc/BlueJ-objects-first-ch2.pdf Vedi File