Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)

6th Edition

ISBN: 9780134477367

Author: David J. Barnes, Michael Kolling

Publisher: PEARSON

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Textbook Question

Chapter 2, Problem 7E

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?

What error message do you get when you now press the Compile button? Do you think this message clearly explains what is wrong?

Change the class back to how it was, and make sure that this clears the error when you compile it.

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Chapter 2, Problem 6E

Chapter 2, Problem 8E

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Chapter 2 Solutions

Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)

Ch. 2 - Create a TicketMachine object on the object bench...Ch. 2 - What value is returned if you get the machine's...Ch. 2 - Prob. 3E Ch. 2 - Prob. 4E Ch. 2 - Create another ticket machine for tickets of a...Ch. 2 - Prob. 6E Ch. 2 - Does it matter whether we write...Ch. 2 - Prob. 8E Ch. 2 - Put back the word public, and then check whether...Ch. 2 - From your earlier experimentation with the ticket...

Ch. 2 - Prob. 11E Ch. 2 - Prob. 12E Ch. 2 - Prob. 13E Ch. 2 - Prob. 14E Ch. 2 - In the following field declaration from the...Ch. 2 - Prob. 16E Ch. 2 - Prob. 17E Ch. 2 - To what class does the following constructor...Ch. 2 - How many parameters does the following constructor...Ch. 2 - Prob. 20E Ch. 2 - Suppose that the class Pet has a field called name...Ch. 2 - Challenge exercise The following object creation...Ch. 2 - Compare the header and body of the getBalance...Ch. 2 - If a call to getPrice can be characterized as...Ch. 2 - If the name of getBalance is changed to getAmount,...Ch. 2 - Prob. 26E Ch. 2 - Try removing the return statement from the body of...Ch. 2 - Compare the method headers of getPrice and...Ch. 2 - Do the insertMoney and printTicket methods have...Ch. 2 - Create a ticket machine with a ticket price of...Ch. 2 - How can we tell from just its header that setPrice...Ch. 2 - Complete the body of the setPrice method so that...Ch. 2 - Prob. 33E Ch. 2 - Is the increase method a mutator? If so, how could...Ch. 2 - Prob. 35E Ch. 2 - Write down exactly what will be printed by the...Ch. 2 - Add a method called prompt to the TicketMachine...Ch. 2 - Prob. 38E Ch. 2 - What about the following version? Ch. 2 - Prob. 40E Ch. 2 - Add a showPrice method to the TicketMachine class....Ch. 2 - Create two ticket machines with differently priced...Ch. 2 - Modify the constructor of TicketMachine so that it...Ch. 2 - Give the class two constructors. One should take a...Ch. 2 - Implement a method, empty, that simulates the...Ch. 2 - Prob. 46E Ch. 2 - Predict what you think will happen if you change...Ch. 2 - Rewrite the if-else statement so that the method...Ch. 2 - Prob. 49E Ch. 2 - In this version of printTicket, we also do...Ch. 2 - Is it possible to remove the else part of the...Ch. 2 - After a ticket has been printed, could the value...Ch. 2 - So far, we have introduced you to two arithmetic...Ch. 2 - Write an assignment statement that will store the...Ch. 2 - Write an assignment statement that will divide the...Ch. 2 - Prob. 56E Ch. 2 - Modify your answer to the previous exercise so...Ch. 2 - Why does the following version of refundBalance...Ch. 2 - What happens if you try to compile the...Ch. 2 - What is wrong with the following version of the...Ch. 2 - Add a new method, emptyMachine, that is designed...Ch. 2 - Rewrite the printTicket method so that it declares...Ch. 2 - Challenge exercise Suppose we wished a single...Ch. 2 - List the name and return type of this method: Ch. 2 - Prob. 65E Ch. 2 - Write out the outer wrapping of a class called...Ch. 2 - Write out definitions for the following fields: Ch. 2 - Write out a constructor for a class called Module....Ch. 2 - Prob. 69E Ch. 2 - Correct the error in this method:...Ch. 2 - Write an accessor method called getName that...Ch. 2 - Write a mutator method called setAge that takes a...Ch. 2 - Write a method called printDetails for a class...Ch. 2 - Draw a picture of the form shown in Figure 2.3,...Ch. 2 - Prob. 75E Ch. 2 - Create a Student with name "djb" and id "859012"....Ch. 2 - Prob. 77E Ch. 2 - Challenge exercise Modify the getLoginName method...Ch. 2 - Consider the following expressions. Try to predict...Ch. 2 - Open the Code Pad in the better-ticket-machine...Ch. 2 - Now add the following in the Code Pad:...Ch. 2 - Add the following: t1.InsertMoney500; What would...Ch. 2 - Prob. 83E Ch. 2 - Prob. 84E Ch. 2 - Add a field, pages, to the Book class to store the...Ch. 2 - Are the Book objects you have implemented...Ch. 2 - Add a method, printDetails, to the Book class....Ch. 2 - Add a further field, refNumber, to the Book class....Ch. 2 - Modify your printDetai 1 s method to include...Ch. 2 - Prob. 90E Ch. 2 - Add a further integer field, borrowed, to the Book...Ch. 2 - Prob. 92E Ch. 2 - Prob. 93E Ch. 2 - Prob. 94E

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