Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
11th Edition
ISBN: 9780134670942
Author: Y. Daniel Liang
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 11.9, Problem 11.9.1CP
Indicate true or false for the following statements:
a. You can always successfully cast an instance of a subclass to a superclass.
b. You can always successfully cast an instance of a superclass to a subclass.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Please help with the following: C# .NET
change the main class so that the user is the one that as to put the name in other words. Write a driver class that prompts for the person’s data input, instantiates an object of class HealtProfile and displays the patient’s information from that object by calling the DisplayHealthRecord, method.
MAIN CLASS----------------------
static void Main(string[] args) { // Instance created holding 6 parameters which are field with value HealthProfile heartRate = new HealthProfile("James","Kill",1978, 79.5 ,175.5, 2021 ); heartRate.DisplayPatientRecord();// call the patient record method }
CLASS HeartProfile-------------------
public class HealthProfile { // attibutes which holds the following value private String _FirstName; private String _LastName; private int _BirthYear; private double _Height; private double _Weigth; private int _CurrentYear; public HealthProfile(string firstName, string lastName, int birthYear, double height, double wt, int…
a.) Write the definition of the default constructor of YClass so that the instance variables of YClasa are initialized to 0.
b.) Write the definition of the default constructor of XClass so that the instance variable of XClass are initialized to 0.
c.) Write the definition of the method two of YClass so that rhe instance variable a is initialized to the value of the first parameter of two, and the instance variable b is initialized to the value of the second parameter of two.
True or False
a.
If you do not write a constructor for a class, java will
supply a default constructor.
b.
Java does not allow constructors to be overloaded.
Abstract methods must have a void return type.
d. All classes have a default equals (Object) method even if
their programmer didn't write one for it.
You can override a static method defined in a superclass.
A method can have at most one return statement.
g.
A method cannot return a Wrapper class reference.
h. The reserved word super can be used to access a constructor
in a parent class.
i. Object is an abstract class.
e.
f.
Chapter 11 Solutions
Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
Ch. 11.2 - True or false? A subclass is subset of a...Ch. 11.2 - What keyword do you use to define a subclass?Ch. 11.2 - What is single inheritance? What is multiple...Ch. 11.3 - What is the output of running the class C in (a)?...Ch. 11.3 - How does a subclass invoke its superclasss...Ch. 11.3 - True or false? When invoking a constructor from a...Ch. 11.4 - True or false? You can override a private method...Ch. 11.4 - True or false? You can override a static method...Ch. 11.4 - How do you explicitly invoke a superclasss...Ch. 11.4 - How do you invoke an overridden superclass method...
Ch. 11.5 - Identify the problems in the following code:...Ch. 11.5 - Prob. 11.5.2CPCh. 11.5 - If a method in a subclass has the same signature...Ch. 11.5 - If a method in a subclass has the same signature...Ch. 11.5 - If a method in a subclass has the same name as a...Ch. 11.5 - Prob. 11.5.6CPCh. 11.7 - Prob. 11.7.1CPCh. 11.8 - Prob. 11.8.1CPCh. 11.8 - Prob. 11.8.2CPCh. 11.8 - Can you assign new int[50], new Integer [50], new...Ch. 11.8 - Prob. 11.8.4CPCh. 11.8 - Show the output of the following code:Ch. 11.8 - Show the output of following program: 1public...Ch. 11.8 - Show the output of following program: public class...Ch. 11.9 - Indicate true or false for the following...Ch. 11.9 - For the GeometricObject and Circle classes in...Ch. 11.9 - Suppose Fruit, Apple, Orange, GoldenDelicious, and...Ch. 11.9 - What is wrong in the following code? 1public class...Ch. 11.10 - Prob. 11.10.1CPCh. 11.11 - Prob. 11.11.1CPCh. 11.11 - Prob. 11.11.2CPCh. 11.11 - Prob. 11.11.3CPCh. 11.11 - Prob. 11.11.4CPCh. 11.11 - Prob. 11.11.5CPCh. 11.12 - Correct errors in the following statements: int[]...Ch. 11.12 - Correct errors in the following statements: int[]...Ch. 11.13 - Prob. 11.13.1CPCh. 11.14 - What modifier should you use on a class so a class...Ch. 11.14 - Prob. 11.14.2CPCh. 11.14 - In the following code, the classes A and B are in...Ch. 11.14 - In the following code, the classes A and B are in...Ch. 11.15 - Prob. 11.15.1CPCh. 11.15 - Indicate true or false for the following...Ch. 11 - Sections 11.211.4 11.1(The Triangle class) Design...Ch. 11 - (Subclasses of Account) In Programming Exercise...Ch. 11 - (Maximum element in ArrayList) Write the following...Ch. 11 - Prob. 11.5PECh. 11 - (Use ArrayList) Write a program that creates an...Ch. 11 - (Shuffle ArrayList) Write the following method...Ch. 11 - (New Account class) An Account class was specified...Ch. 11 - (Largest rows and columns) Write a program that...Ch. 11 - Prob. 11.10PECh. 11 - (Sort ArrayList) Write the following method that...Ch. 11 - (Sum ArrayList) Write the following method that...Ch. 11 - (Remove duplicates) Write a method that removes...Ch. 11 - (Combine two lists) Write a method that returns...Ch. 11 - (Area of a convex polygon) A polygon is convex if...Ch. 11 - Prob. 11.16PECh. 11 - (Algebra: perfect square) Write a program that...Ch. 11 - (ArrayList of Character) Write a method that...Ch. 11 - (Bin packing using first fit) The bin packing...
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
When you define an ADT as a C++ class, what items are considered part of the interface for the ADT? What items ...
Problem Solving with C++ (9th Edition)
(Instance Variables) Explain the purpose of an instance variable.
Java How To Program (Early Objects)
The following table represents the addresses and contents (using hexadecimal notation) of some cells in a machi...
Computer Science: An Overview (13th Edition) (What's New in Computer Science)
Look at the following classes: public class Ground { public Ground() { System.out.println(You are on the ground...
Starting Out with Java: From Control Structures through Objects (6th Edition)
Practice Problem 3.43 (solution page 344) Suppose you are given the job of checking that a C compiler generates...
Computer Systems: A Programmer's Perspective (3rd Edition)
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
- TOPIC: Inheritance In Python, modify the given code based on the given specifications below. Create another class, “Food.” For the Food class, the specifications are: The object will have the following attributes on initialization: weight (weight of the food in kg) energy_add (amount of energy it will add once consumed) happiness_add (amount of happiness it will add once consumed) Modify the Child and the Friends classes such that: Instead of accepting a string (as food) in the eat method, the method should accept a Foodobject Once a Child/Friendsobject eats a Food object: The added weight should be the Food object’s weight The added energy should be the Food object’s energy_add The added happiness should be the Food object’s happiness_add After modifying the Child and Friends behavior, simulate a small group of Friends. In the main code, do the following: Accept a positive integer from the user that determines the number of friends and create a number of Friends specified…arrow_forwardAnswer with True or False for the following. Explain your answers.-It is legal to write a method in a class which overloads another method declared in the same.-It is legal to write a method in a superclass which overrides a method declared in a sub-class.arrow_forwardTOPIC: Inheritance In Python, modify the given code based on the given specifications below. Create another class, “Food.” For the Food class, the specifications are: The object will have the following attributes on initialization: weight (weight of the food in kg) energy_add (amount of energy it will add once consumed) happiness_add (amount of happiness it will add once consumed) Modify the Child and the Friends classes such that: Instead of accepting a string (as food) in the eat method, the method should accept a Foodobject Once a Child/Friendsobject eats a Food object: The added weight should be the Food object’s weight The added energy should be the Food object’s energy_add The added happiness should be the Food object’s happiness_add The given code (can also be found on the picture): class Child: def __init__(self, child_number: int, name: str, weight: float): self.child_number = child_number self.name = name self.weight = weight def…arrow_forward
- Solve as C++ Code please: 1- Creates a class Student with 3 attributes: name, id and level. a. Add a constructor able to create a Student; b. Add the methods getId and getLevel; c. Add the method display able to display the attributes, 2- Creates a class StudentPhD extending the class Student with two more attributes: specialty and supervisorName; a. Add a constructor to create a StudentPhd b. Add a display method: display need to override (polymorphism) the previous display method of Student class; 3- Creates a class called College with 6 attributes: a. maxStud: a maximum number of Student into the college; b. nbStud: the current number of Student into the college. When a College is created, the number nbStud is equal to 0; c. Student Stud[]: an array of Student. The size of this array is equal to maxStud; d. maxPhdStud: a maximum number of PhDStudent into the college; e. nbPhdStud: the current number of PhDStudent into the college. When a College is created, the number nbPhDStud is…arrow_forwardTrue or false?(a) You can override a nonprivate method defined in a superclass.(b) You can override a private method defined in a superclass.(c) You can override the initializer defined in a superclass. (d) When constructing an object from a subclass, its superclass’s initializer is automatically invoked.arrow_forwardWhat is the process of defining a method in a subclass having same name & type signature as a method in its superclass? a) Method overloading b) Method overriding c) Method hiding d) None of the mentionedarrow_forward
- IN JAVA PLEASE Child Class: Vegetable Write a child class called Vegetable. A vegetable is described by a name, the number of grams of sugar (as a whole number), the number of grams of sodium (as a whole number), and whether or not the vegetable is a starch. For the Vegetable class, write: the complete class header the instance data variables a constructor that sets the instance data variables based on parameters getters and setters; use instance data variables where appropriate a toString method that returns a text representation of a Vegetable object that includes all four characteristics of the vegetablearrow_forwardDesign/code/test a Java program containing an abstract the class absWelcome. This class should contain: 1. A public abstract void method (you name it) that is empty 2. A public regular method (you name it) that prints "Welcome to " Next, create a subclass clsHello that extends absWelcome. This class should contain: • A public regular method (you name it) that prints "Java Programming" Finally, inside the Main class create an object (you name it) from the clsHello class. Use this new object reference to: 1. Output "Welcome to " from the abstract class 2. Output "Java Programming" from the subclass Your output should resemble that shown below >sh -c javac -classpath -type f-name '*.java') java -classpath :targe Welcome to Java Programmingarrow_forwardwrite in java Write a CashRegister class that can be used with the RetailItem class that you wrote inChapter 6’s Programming Challenge 4. (in the attachments) The CashRegister class should simulate the sale ofa retail item. It should have a constructor that accepts a RetailItem object as an argument.The constructor should also accept an integer that represents the quantity of items beingpurchased. In addition, the class should have the following methods:• The getSubtotal method should return the subtotal of the sale, which is the quantitymultiplied by the price. This method must get the price from the RetailItem objectthat was passed as an argument to the constructor.• The getTax method should return the amount of sales tax on the purchase. The salestax rate is 6 percent of a retail sale.• The getTotal method should return the total of the sale, which is the subtotal plus thesales tax.Demonstrate the class in a program that asks the user for the quantity of items being purchased,and…arrow_forward
- Language is Java Write a Clothing class with the following attributes: color (e.g., "blue", "green", "orange") displayName (e.g., "Doctor Who hoodie", "slacks") price (e.g., 19.99, 7) Include only one constructor. It should have parameters for each of the attributes and set their values. Additionally, include getters and setters for each of the attributes. Add a driver, name it Purchases, and create 2 Clothing objects. Finally, print out some information about both objects (i.e., print the information from some or all of the getters). For example, if you created a Clothing object whose color was blue, whose display name was work trousers, for a price of 27.99, you could use the getters to print something like this:These work trousers are blue and cost $27.99.Don't hardcode the print statement for full credit, you must use the gettersarrow_forwardPLEASE USE 2 CLASSES (you do not have to answer quickly please take your time) In the Game of 21, a player is dealt two cards from a deck of playing cards and then optionally givena third card. The player closest to 21 points without going over is the winner. Use object-orienteddevelopment to create a Game of 21 application that allows the user to play the Game of 21 against thecomputer. The Game of 21 application and its objects should:• Deal a card from a deck of playing cards by generating a random number between 1and 13. A 1 corresponds to an Ace, numbers 2 through 10 correspond to those cards,and 11 through 13 corresponds to Jack, Queen, and King. The Jack, Queen, and Kinghave a value of 10 in the Game of 21. An Ace can have a value of either 1 or 11.• Allow the player to stay with two cards or be given a third card.• Announce the winner.• Play rounds until the player says to stoparrow_forwardUse JAVA - This task helps you understand how constructors work in inheritance Create a superclass, called SuperClass. Create a constructor for it. Inside the constructor, let it print “this is super class.” Create a childclass of SuperClass, called ChildClass. Create a constructor for it. Inside the constructor, let it print “this is child class.” Create a main function and create a new object for ChildClass. Observe what’s printed in console. What will happen if you have a default constructor without parameters in addition to the one with parameters?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Microsoft Visual C#Computer ScienceISBN:9781337102100Author:Joyce, Farrell.Publisher:Cengage Learning,
Microsoft Visual C#
Computer Science
ISBN:9781337102100
Author:Joyce, Farrell.
Publisher:Cengage Learning,
Introduction to Classes and Objects - Part 1 (Data Structures & Algorithms #3); Author: CS Dojo;https://www.youtube.com/watch?v=8yjkWGRlUmY;License: Standard YouTube License, CC-BY