Starting Out with Java: Early Objects (6th Edition)
6th Edition
ISBN: 9780134457963
Author: GADDIS
Publisher: PEARSON
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Chapter 9, Problem 3AW
Write the declaration for class B. The class’s members should be as follows:
- m, an integer. This variable should not be accessible to code outside the class or to any class that extends class B.
- n, an integer. This variable should be accessible only to classes that extend class B or are in the same package as class B.
- setM, getM, setN, and getN. These are the mutator and accessor methods for the member variables m and n. These methods should be accessible to code outside the class.
- calc. This is a public abstract method.
Next, write the declaration for class D, which extends class B, The class’s members should be as follows:
- q, a double. This variable should not be accessible to code outside the class.
- r, a double. This variable should be accessible to any class that extends class D or is in the same package.
- setQ, getQ, setR, and getR. These are the mutator and accessor methods for the member variables q and r. These methods should be accessible to code outside the class.
- calc, a public method that overrides the superclass’s abstract calc method. This method should return the value of q times r.
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a) Write the declaration for class B. The members of the class should be as follows:
m, an integer. This variable should not be accessible to code outside the class or to any class that extends class B.
n, an integer. This variable should be accessible only to classes that extends class B or are in the same package as class B.
setM, getM,setN, getN. These are the mutator aand accessor methods for the member variables m and n. These methods should be accessible to code outside the class.
calc. This is a public abstract method.
b) Write a declaration for class D, which extends class B. The members of the class are as follows:
q, a double. This variable should not be accessible to code outside the class.
r, a double. This variable should be accessible to any class that extends class D or is in the same package.
setQ, getQ,setR, getR. These are the mutator aand accessor methods for the member variables q and r. These methods should be accessible to code outside the class.
Calc, a…
Write a class Distance which has two private data members (int feet,float inches).
The class has three constructors which are
having no parameter - values of both feet and inches are assigned zero.
having two numbers as parameters - the two numbers are assigned as feet and inches respectively.
having one number as parameter - both feet and inches are assigned that number.
Provide getters and setters for data members.
Now write a main class which demonstrate the functionality of above class by calling all constructors, setters & getters.
Create 1 object using default constructor, and use setters to set values, then getters to print values.
Create a second object using constructor having two parameters, provide values, then print values on screen.
Create third object by using third constructor having one parameter, after that print values on screen.
Write a full class definition for a class named
Counter
, and containing the following members:
A data member
counter
of type
int
.
A constructor that takes one
int
argument and assigns its value to
counter
.
A function called
increment
that accepts no parameters and returns no value.
increment
adds one to the
counter
data member.
A function called
decrement
that accepts no parameters and returns no value.
decrement
subtracts one to the
counter
data member.
A function called
getValue
that accepts no parameters. It returns the value of the instance variable
counter
.
Chapter 9 Solutions
Starting Out with Java: Early Objects (6th Edition)
Ch. 9.1 - Here is the first line of a class declaration....Ch. 9.1 - Look at the following class declarations and...Ch. 9.1 - Class B extends class A. (Class A is the...Ch. 9.2 - Prob. 9.4CPCh. 9.2 - Look at the following classes: public class Ground...Ch. 9.3 - Under what circumstances would a subclass need to...Ch. 9.3 - How can a subclass method call an overridden...Ch. 9.3 - If a method in a subclass has the same signature...Ch. 9.3 - If a method in a subclass has the same name as a...Ch. 9.3 - Prob. 9.10CP
Ch. 9.4 - When a class member is declared as protected, what...Ch. 9.4 - What is the difference between private members and...Ch. 9.4 - Why should you avoid making class members...Ch. 9.4 - Prob. 9.14CPCh. 9.4 - Why is it easy to give package access to a class...Ch. 9.6 - Look at the following class definition: public...Ch. 9.6 - When you create a class, it automatically has a...Ch. 9.7 - Recall the Rectangle and Cube classes discussed...Ch. 9.8 - Prob. 9.19CPCh. 9.8 - If a subclass extends a superclass with an...Ch. 9.8 - What is the purpose of an abstract class?Ch. 9.8 - If a class is defined as abstract, what can you...Ch. 9.9 - Prob. 9.23CPCh. 9.9 - Prob. 9.24CPCh. 9.9 - Prob. 9.25CPCh. 9.9 - Prob. 9.26CPCh. 9.9 - Prob. 9.27CPCh. 9.9 - Prob. 9.28CPCh. 9 - In an inheritance relationship, this is the...Ch. 9 - In an inheritance relationship, this is the...Ch. 9 - This key word indicates that a class inherits from...Ch. 9 - A subclass does not have access to these...Ch. 9 - This key word refers to an objects superclass. a....Ch. 9 - In a subclass constructor, a call to the...Ch. 9 - The following is an explicit call to the...Ch. 9 - A method in a subclass that has the same signature...Ch. 9 - A method in a subclass having the same name as a...Ch. 9 - These superclass members are accessible to...Ch. 9 - Prob. 11MCCh. 9 - With this type of binding, the Java Virtual...Ch. 9 - Prob. 13MCCh. 9 - Prob. 14MCCh. 9 - Prob. 15MCCh. 9 - Abstract classes cannot ___________. a. be used as...Ch. 9 - You use the __________ operator to define an...Ch. 9 - Prob. 18MCCh. 9 - Prob. 19MCCh. 9 - You can use a lambda expression to instantiate an...Ch. 9 - True or False: Constructors are not inherited.Ch. 9 - True or False: in a subclass, a call to the...Ch. 9 - True or False: If a subclass constructor does not...Ch. 9 - True or False: An object of a superclass can...Ch. 9 - True or False: The superclass constructor always...Ch. 9 - True or False: When a method is declared with the...Ch. 9 - True or False: A superclass has a member with...Ch. 9 - True or False: A superclass reference variable can...Ch. 9 - True or False: A subclass reference variable can...Ch. 9 - True or False: When a class contains an abstract...Ch. 9 - True or False: A class may only implement one...Ch. 9 - True or False: By default all members of an...Ch. 9 - // Superclass public class Vehicle { (Member...Ch. 9 - // Superclass public class Vehicle { private...Ch. 9 - // Superclass public class Vehicle { private...Ch. 9 - // Superclass public class Vehicle { public...Ch. 9 - Write the first line of the definition for a...Ch. 9 - Look at the following code, which is the first...Ch. 9 - Write the declaration for class B. The classs...Ch. 9 - Write the statement that calls a superclass...Ch. 9 - A superclass has the following method: public void...Ch. 9 - A superclass has the following abstract method:...Ch. 9 - Prob. 7AWCh. 9 - Prob. 8AWCh. 9 - Look at the following interface: public interface...Ch. 9 - Prob. 1SACh. 9 - A program uses two classes: Animal and Dog. Which...Ch. 9 - What is the superclass and what is the subclass in...Ch. 9 - What is the difference between a protected class...Ch. 9 - Can a subclass ever directly access the private...Ch. 9 - Which constructor is called first, that of the...Ch. 9 - What is the difference between overriding a...Ch. 9 - Prob. 8SACh. 9 - Prob. 9SACh. 9 - Prob. 10SACh. 9 - What is an. abstract class?Ch. 9 - Prob. 12SACh. 9 - When you instantiate an anonymous inner class, the...Ch. 9 - Prob. 14SACh. 9 - Prob. 15SACh. 9 - Employee and ProductionWorker Classes Design a...Ch. 9 - ShiftSupervisor Class In a particular factory, a...Ch. 9 - TeamLeader Class In a particular factory, a team...Ch. 9 - Essay Class Design an Essay class that extends the...Ch. 9 - Course Grades In a course, a teacher gives the...Ch. 9 - Analyzable Interface Modify the CourseGrades class...Ch. 9 - Person and Customer Classes Design a class named...Ch. 9 - PreferredCustomer Class A retail store has a...Ch. 9 - BankAccount and SavingsAccount Classes Design an...Ch. 9 - Ship, CruiseShip, and CargoShip Classes Design a...
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