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 47E

Predict what you think will happen if you change the test in insertMoney to use the greater-than or equal-to operator:

if amount > = 0

Check your predictions by running some tests. What is the one situation in which it makes a difference to the behavior of the method?

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Chapter 2, Problem 46E

Chapter 2, Problem 48E

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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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Predict what you think will happen if you change the test in insertMoney to use the greater-than or equal-to operator: if amount &gt; = 0 Check your predictions by running some tests. What is the one situation in which it makes a difference to the behavior of the method?

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Chapter 2 Solutions

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Predict what you think will happen if you change the test in insertMoney to use the greater-than or equal-to operator: if amount > = 0 Check your predictions by running some tests. What is the one situation in which it makes a difference to the behavior of the method?