Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
6th Edition
ISBN: 9780134477367
Author: David J. Barnes, Michael Kolling
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 2, Problem 76E
Create a Student with name "djb" and id "859012". What happens when getLoginName is called on this student? Why do you think this is?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Create some Student objects. Call the getName method on each object. Explain what is happening.
This is a new homework assignment. Fill in the blanks.
Complete the following code. Attach the simulation too.
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. 3ECh. 2 - Prob. 4ECh. 2 - Create another ticket machine for tickets of a...Ch. 2 - Prob. 6ECh. 2 - Does it matter whether we write...Ch. 2 - Prob. 8ECh. 2 - Put back the word public, and then check whether...Ch. 2 - From your earlier experimentation with the ticket...
Ch. 2 - Prob. 11ECh. 2 - Prob. 12ECh. 2 - Prob. 13ECh. 2 - Prob. 14ECh. 2 - In the following field declaration from the...Ch. 2 - Prob. 16ECh. 2 - Prob. 17ECh. 2 - To what class does the following constructor...Ch. 2 - How many parameters does the following constructor...Ch. 2 - Prob. 20ECh. 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. 26ECh. 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. 33ECh. 2 - Is the increase method a mutator? If so, how could...Ch. 2 - Prob. 35ECh. 2 - Write down exactly what will be printed by the...Ch. 2 - Add a method called prompt to the TicketMachine...Ch. 2 - Prob. 38ECh. 2 - What about the following version?
Ch. 2 - Prob. 40ECh. 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. 46ECh. 2 - Predict what you think will happen if you change...Ch. 2 - Rewrite the if-else statement so that the method...Ch. 2 - Prob. 49ECh. 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. 56ECh. 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. 65ECh. 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. 69ECh. 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. 75ECh. 2 - Create a Student with name "djb" and id "859012"....Ch. 2 - Prob. 77ECh. 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. 83ECh. 2 - Prob. 84ECh. 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. 90ECh. 2 - Add a further integer field, borrowed, to the Book...Ch. 2 - Prob. 92ECh. 2 - Prob. 93ECh. 2 - Prob. 94E
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
A variable that is visible to every function in a program file is a __________. a. local variable b. universal ...
Starting Out with Python (3rd Edition)
Give an example of a data constraint.
Database Concepts (8th Edition)
Practice Problem 11.3 (solution page 967) Write a program dd2hex.c that converts its dotted-decimal argument to...
Computer Systems: A Programmer's Perspective (3rd Edition)
To complete this problem you must have a computer that is capable of viewing Scalable Vector Graphics (SVG) fil...
Problem Solving with C++ (10th Edition)
Write a program that allows the user to enter a number of quarters, dimes, and nickels and then outputs the mon...
Problem Solving with C++ (9th Edition)
What is the general problem with static scoping?
Concepts Of Programming Languages
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- Create an object of class LabClass. As the signature indicates, you need to specify the maximum number of students in that class (an integer).arrow_forward.If the name of getBalance is changed to getAmount, does the return statement in the body of the method also need to be changed for the code to compile? Try it out within BlueJ. What does this tell you about the name of an accessor method and the name of the field associated with it?arrow_forwardExamine the getBalance method's header and body, and then evaluate how they stack up against those of the getPrice method. I'm confused as to the differences between the two.arrow_forward
- Try removing the return statement from the body of getPrice. What error message do you see now when you try compiling the class?arrow_forwardHashMap is a parameterized class. List those of its methods that depend on the types used to parameterize it. Do you think the same type could be used for both of its parameters?arrow_forwardWhat is a HashMap? What is its purpose and how do you use it? Answer these questions in writing, and use the Java library documentation of Map and HashMap for your responses. Note that you will find it hard to understand everything, as the documentation for these classes is not very good. We will discuss the details later in this chapter, but see what you can find out on your own before reading on.arrow_forward
- PLEASE ENSURE TO USE THE FRAMEWORK PROVIDED IN THE IMAGES, AND THAT IT WORKS WITH THE TESTER CLASS. PLEASE EDIT BOTH THE TEST CLASS, DO NOT EDIT THE MAIN METHOD. Write a BankAccountTester class whose main method constructs a bank account, deposits $1,000, withdraws $500, withdraws another $400, and then prints the remaining balance. Also print the expected result.arrow_forwardIt is time for you to demonstrate your skills in a project of your own choice. You must DESIGN,ANALYSE AND CODE any method for the GENERIC MyLinkedList class that will manipulate the linkedlist. You can decide yourself what it should be following the specification below:1. Purpose: The method must make logical sense – it should be of some purpose to somebody.You should describe in the text who will use the method for which purpose.2. Clearly explain the problem. Then clearly explain how your method will solve it.3. Test program: Test the method using a wrapped class like Integer however, you will get extramarks if you can test it with the new classes you created in I_Do1 and I_Do2.arrow_forwardIt is time for you to demonstrate your skills in a project of your own choice. You must DESIGN,ANALYSE AND CODE any method for the GENERIC MyLinkedList class that will manipulate the linkedlist. You can decide yourself what it should be following the specification below:1. Purpose: The method must make logical sense – it should be of some purpose to somebody.You should describe in the text who will use the method for which purpose.2. Clearly explain the problem. Then clearly explain how your method will solve it.3. Test program: Test the method using a wrapped class like Integer wrapper class. All of this must be done using generic linked lists, and coded in java.arrow_forward
- It is time for you to demonstrate your skills in a project of your own choice. You must DESIGN,ANALYSE AND CODE any method for the GENERIC MyLinkedList class that will manipulate the linkedlist. You can decide yourself what it should be following the specification below:1. Purpose: The method must make logical sense – it should be of some purpose to somebody.You should describe in the text who will use the method for which purpose.2. Clearly explain the problem. Then clearly explain how your method will solve itarrow_forwardCan you draw a class diagram on the text with the appropriate classes, attributes, methods, and relationships. (Please use the draw.io web site for drawing.) Here are the main classes and their relationships: HoneynetCentralServer Attributes: cronjobInterval Relationships: has many Honeypots has a LogProcessor Honeypot Attributes: ipAddress, sshCredentials Relationships: has many LogEntries LogEntry Attributes: timestamp, message, actionType (e.g., delete, create in FTP), attackLevel (low, medium, or high) Relationships: belongs to a Honeypot LogProcessor (Nodejs tool) Attributes: ruleFilters Methods: processLogEntries(logEntries) Relationships: processes LogEntries MongoDBAtlasDatabase Attributes: connectionString Methods: storeLogEntries(logEntries) Relationships: stores LogEntries ManagementTool (ElectronJS) Attributes: graphicalLibraries, visualLibraries Methods: displayData(data) Relationships: displays data from MongoDBAtlasDatabase ExternalAPI Attributes: apiUrl,…arrow_forwardCreate a new project for this program called TestOldMaid and add a class with a main() method. In the project: Copy your Deck and Card class from the earlier project into it. Create a subclass of Deck called OldMaidDeck. It is special because one of the Queens is missing so it only has 51 cards. Create a constructor method that calls the super class constructor, then removes a queen. Override the toString method so it returns the name of the deck and the number of cards in it. Write the test main() method. Create an OldMaidDeck object and deal all the cards to six players. It is ok if not everyone has an equal number of cards. Use arrays or ArrayLists for the players hands. Show the hands of all 6 players. Refer to the web to find out more about the Old Maid card game: https://bicyclecards.com/how-to-play/old-maid/ Fully document all classes with your name, date and description. And each data member and method is documented. Each block that does something is also documented.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill EducationStarting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSONDigital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON
- C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSONDatabase Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage LearningProgrammable Logic ControllersComputer ScienceISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education
Database System Concepts
Computer Science
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:McGraw-Hill Education
Starting Out with Python (4th Edition)
Computer Science
ISBN:9780134444321
Author:Tony Gaddis
Publisher:PEARSON
Digital Fundamentals (11th Edition)
Computer Science
ISBN:9780132737968
Author:Thomas L. Floyd
Publisher:PEARSON
C How to Program (8th Edition)
Computer Science
ISBN:9780133976892
Author:Paul J. Deitel, Harvey Deitel
Publisher:PEARSON
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781337627900
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning
Programmable Logic Controllers
Computer Science
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education
Java Math Library; Author: Alex Lee;https://www.youtube.com/watch?v=ufegX5o8uc4;License: Standard YouTube License, CC-BY