Objects First with Java: A Practical In...6th EditionDavid J. Barnes, Michael Kolling Publisher: PEARSONISBN: 9780134477367
Objects First with Java: A Practical In...
Solutions for Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
Problem 1E:
Create a TicketMachine object on the object bench and take a look at its methods. You should see the...Problem 5E:
Create another ticket machine for tickets of a different price; remember that you have to supply...Problem 7E:
Does it matter whether we write publicclassTicketMachineorclasspublicTicketMachine in the outer...Problem 9E:
Put back the word public, and then check whether it is possible to leave out the word class by...Problem 10E:
From your earlier experimentation with the ticket machine objects within BlueJ, you can probably...Problem 15E:
In the following field declaration from the TicketMachine class private int price; does it matter...Problem 19E:
How many parameters does the following constructor have, and what are their types?
public Book...Problem 21E:
Suppose that the class Pet has a field called name that is of the type String. Write an assignment...Problem 22E:
Challenge exercise The following object creation will result in the constructor of the Date class...Problem 23E:
Compare the header and body of the getBalance method with the header and body of the getPrice...Problem 24E:
If a call to getPrice can be characterized as "What do tickets cost?" how would you characterize a...Problem 25E:
If the name of getBalance is changed to getAmount, does the return statement in the body of the...Problem 27E:
Try removing the return statement from the body of getPrice. What error message do you see now when...Problem 28E:
Compare the method headers of getPrice and printTicket in Code 2.1. Apart from their names, what is...Problem 29E:
Do the insertMoney and printTicket methods have return statements? Why do you think this might be?...Problem 30E:
Create a ticket machine with a ticket price of your choosing. Before doing anything else, call the...Problem 31E:
How can we tell from just its header that setPrice is a method and not a constructor?
public void...Problem 32E:
Complete the body of the setPrice method so that it assigns the value of its parameter to the price...Problem 36E:
Write down exactly what will be printed by the following statement: System. out. Println ("My cat...Problem 37E:
Add a method called prompt to the TicketMachine class. This should have a void return type and take...Problem 39E:
What about the following version?
Problem 41E:
Add a showPrice method to the TicketMachine class. This should have a void return type and take no...Problem 42E:
Create two ticket machines with differently priced tickets. Do calls to their showPrice methods show...Problem 43E:
Modify the constructor of TicketMachine so that it no longer has a parameter. Instead, the price of...Problem 44E:
Give the class two constructors. One should take a single parameter that specifies the price, and...Problem 45E:
Implement a method, empty, that simulates the effect of removing all money from the machine. This...Problem 47E:
Predict what you think will happen if you change the test in insertMoney to use the greater-than or...Problem 48E:
Rewrite the if-else statement so that the method still behaves correctly but the error message is...Problem 50E:
In this version of printTicket, we also do something slightly different with the total and balance...Problem 51E:
Is it possible to remove the else part of the if-statement in the printTicket method (i.e., remove...Problem 52E:
After a ticket has been printed, could the value in the balance field ever be set to a negative...Problem 53E:
So far, we have introduced you to two arithmetic operators, that can be used in arithmetic...Problem 54E:
Write an assignment statement that will store the result of multiplying two variables, price and...Problem 55E:
Write an assignment statement that will divide the value in total by the value in count and store...Problem 57E:
Modify your answer to the previous exercise so that the message includes the value of your budget if...Problem 58E:
Why does the following version of refundBalance not give the same results as the original?...Problem 59E:
What happens if you try to compile the TIcketMachine class with the following version of...Problem 60E:
What is wrong with the following version of the constructor of TIcketMachine?
Try out this...Problem 61E:
Add a new method, emptyMachine, that is designed to simulate emptying the machine of money, it...Problem 62E:
Rewrite the printTicket method so that it declares a local variable, amountLeftloPay. This should...Problem 63E:
Challenge exercise Suppose we wished a single TicketMachine object to be able to issue tickets of...Problem 64E:
List the name and return type of this method:
Problem 66E:
Write out the outer wrapping of a class called Person. Remember to include the curly brackets that...Problem 67E:
Write out definitions for the following fields:
Problem 68E:
Write out a constructor for a class called Module. The constructor should take a single parameter of...Problem 71E:
Write an accessor method called getName that returns the value of a field called name, whose type is...Problem 72E:
Write a mutator method called setAge that takes a single parameter of type int and sets the value of...Problem 73E:
Write a method called printDetails for a class that has a field of type String called name. The...Problem 74E:
Draw a picture of the form shown in Figure 2.3, representing the initial state of a Student object...Problem 76E:
Create a Student with name "djb" and id "859012". What happens when getLoginName is called on this...Problem 78E:
Challenge exercise Modify the getLoginName method of Student so that it always generates a login...Problem 79E:
Consider the following expressions. Try to predict their results, and then type them in the Code Pad...Problem 80E:
Open the Code Pad in the better-ticket-machine project. Type the following in the Code Pad:
Take...Problem 81E:
Now add the following in the Code Pad: TicketMachinet2=t1; What would you expect a call to...Problem 82E:
Add the following: t1.InsertMoney500; What would you expect the following to return? Think carefully...Problem 85E:
Add a field, pages, to the Book class to store the number of pages. This should be of type int, and...Problem 87E:
Add a method, printDetails, to the Book class. This should print details of the author, title, and...Problem 88E:
Add a further field, refNumber, to the Book class. This field can store a reference number for a...Problem 89E:
Modify your printDetai 1 s method to include printing the reference number. However, the method...Browse All Chapters of This Textbook
Chapter 1 - Objects And ClassesChapter 2 - Understanding Class DefinitionsChapter 3 - Object InteractionChapter 4 - Grouping ObjectsChapter 6 - More-sophisticated BehaviorChapter 7 - Fixed-size Collections—arraysChapter 8 - Designing ClassesChapter 9 - Weil-behaved ObjectsChapter 10 - Improving Structure With InheritanceChapter 11 - More About Inheritance
Sample Solutions for this Textbook
We offer sample solutions for Objects First with Java: A Practical Introduction Using BlueJ (6th Edition) homework problems. See examples below:
Given: The class names such as Circle, Square, Triangle, Person, and Canvas. To find:Â The possible...Chapter 2, Problem 1EGiven: The lab-classes project and the object of LabClass as well as Student and three students are...Given: The project name music-organizer-v1 and the class name MusicOrganizer. To find: The way to...Given: The weblog-analyzer project with LogAnalyzer class, analyzeHourlyDataas well as...Explanation: Java allows using the JUnit test framework to write and execute automated tests. It...Given: The network project version and the display method is in the Post class. To find: The display...
More Editions of This Book
Corresponding editions of this textbook are also available below:
Objects First With Java: A Practical Introduction Using Bluej (5th Edition)
5th Edition
ISBN: 9780132492669
Objects First With Java: A Practical Introduction Using Bluej, Global Edition
6th Edition
ISBN: 9781292159041
EBK OBJECTS FIRST WITH JAVA
6th Edition
ISBN: 8220102955318
EBK OBJECTS FIRST WITH JAVA
6th Edition
ISBN: 9780134478449
Objects First With Java: A Practical Introduction Using Bluej.
5th Edition
ISBN: 9780132835541
Objects First With Java: A Practical Introduction Using Bluej (4th Edition)
4th Edition
ISBN: 9780136060864
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