a class named “numeric” having the one attribute number and one method void set_value(int) and get_value() which sets the value of number. Create two classes square and cube that inherits the “numeric” class. Class square has a function that returns the square of a number (number is inherited from the numeric class). Class cube has function which returns the cube of a number. In the main function create object of child classes and display square and cube of a number.

a class named “numeric” having the one attribute number and one method void set_value(int) and get_value() which sets the value of number. Create two classes square and cube that inherits the “numeric” class. Class square has a function that returns the square of a number (number is inherited from the numeric class). Class cube has function which returns the cube of a number. In the main function create object of child classes and display square and cube of a number.

EBK JAVA PROGRAMMING

9th Edition

ISBN:9781337671385

Author:FARRELL

Publisher:FARRELL

Chapter10: Introduction To Inheritance

Section: Chapter Questions

Problem 4PE

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a. Write a FractionDemo program that instantiates several Fraction objects and demonstrates that their methods work correctly. Create a Fraction class with fields that hold a whole number, a numerator, and a denominator. In addition: Create properties for each field. The set access or for the denominator should not allow a 0 value; the value defaults to 1. Add three constructors. One takes three parameters for a whole number, numerator, and denominator. Another accepts two parameters for the numerator and denominator; when this constructor is used, the whole number value is 0. The last constructor is parameterless; it sets the whole number and numerator to 0 and the denominator to 1. (After construction, Fractions do not have to be reduced to proper form. For example, even though 3/9 could be reduced to 1/3, your constructors do not have to perform this task.) Add a Reduce() method that reduces a Fraction if it is in improper form. For example, 2/4 should be reduced to 1/2. Add an operator+() method that adds two Fractions. To add two fractions, first eliminate any whole number part of the value. For example, 2 1/4 becomes 9/4 and 1 3/5 becomes 8/5. Find a common denominator and convert the fractions to it. For example, when adding 9/4 and 8/5, you can convert them to 45/20 and 32/20. Then you can add the numerators, giving 77/20. Finally, call the Reduce() method to reduce the result, restoring any whole number value so the fractional part of the number is less than 1. For example, 77/20 becomes 3 17/20. Include a function that returns a string that contains a Fraction in the usual display formatâ€”the whole number, a space, the numerator, a slash (D, and a denominator. When the whole number is 0, just the Fraction part of the value should be displayed (for example, 1/2 instead of 0 1/2). If the numerator is 0, just the whole number should be displayed (for example, 2 instead of 2 0/3). b. Add an operator*() method to the Fraction class created in Exercise 11a so that it correctly multiplies two Fractions. The result should be in proper, reduced format. Demonstrate that the method works correctly in a program named FractionDemo2. c. Write a program named FractionDem03 that includes an array of four Fractions. Prompt the user for values for each. Display every possible combination of addition results and every possible combination of multiplication results for each Fraction pair (that is, each type will have 16 results).
Write a program named SalespersonDemo that instantiates objects using classes named Real EstateSalesperson and GirlScout. Demonstrate that each object can use a SalesSpeech() method appropriately. Also, use a MakeSale() method two or three times with each object, and display the final contents of each objects data fields. First, create an abstract class named Salesperson. Fields include first and last names; the Salesperson constructor requires both these values. Include properties for the fields. Include a method that returns a string that holds the Salespersons full nameâ€”the first and last names separated by a space. Then perform the following Create two child classes of Salesperson: Real EstateSalesperson and Girl Scout. The Real EstateSalesperson class contains fields for total value sold in dollars and total commission earned (both of which are initialized to 0), and a commission rate field required by the class constructor. The Girl Scout class includes a field to hold the number of boxes of cookies sold, which is initialized to 0. Include properties for every field. Create an interface named ISell able that contains two methods: SalesSpeech() and MakeSale(). In each Real EstateSalesperson and Girl Scout class, implement SalesSpeech() to display an appropriate one- or two-sentence sales speech that the objects of the class could use. In the Real Estatesalesperson class, implement the MakeSale() method to accept an integer dollar value for a house, add the value to the Real EstateSalespersons total value sold, and compute the total commission earned. In the Girl Scout class, implement the MakeSale() method to accept an integer representing the number of boxes of cookies sold and add it to the total field.
In Chapter 9, you created a Contestant class for the Greenville Idol competition. The class includes a contestants name, talent code, and talent description. The competition has become so popular that separate contests with differing entry fees have been established for children, teenagers, and adults. Modify the Contestant class to contain a field that holds the entry fee for each category, and add get and set accessors. Extend the Contestant class to create three subclasses: ChildContestant, TeenContestant, and AdultContestant. Child contestants are 12 years old and younger, and their entry fee is $15. Teen contestants are between 13 and 17 years old, inclusive, and their entry fee is S20. Adult contestants are 18 years old and older, and their entry fee is $30. In each subclass, set the entry fee field to the correct value, and override the Tostring() method to return a string that includes all the contestant data, including the age category and the entry fee. Modify the GreenvilleRevenue program so that it performs the following tasks: The program prompts the user for the number of contestants in this years competition, which must be between 0 and 30. The program continues to prompt the user until a valid value is entered. The program prompts the user for names, ages, and talent codes for the contestants entered. Along with the prompt for a talent code, display a list of valid categories. Based on the age entered for each contestant, create an object of the correct type (adult, teen, or child), and store it in an array of Contestant objects. After data entry is complete, display the total expected revenue, which is the sum of the entry fees for the contestants. After data entry is complete, display the valid talent categories and then continuously prompt the user for talent codes, and display all the data for all the contestants in each category. Display an appropriate message if the entered code is not a character or a valid code.
Create a class named State that holds the following fields: a String for the name of the state, an integer forthe population, and two City objects that hold data about the capital city and the most populous city. TheState constructor requires six parameters that represent the names and populations of the state, its capital,and its most populous city. Provide get methods for each field. Create the City class to be a nonstatic, privateinner class within the State class; the City class contains a city’s name and population. Create a class to assign values to and display values from two State objects. Save the files as State.java and TestState.java.
Create a class named “Rectangle” having length and width as attribute. There should be behaviorstoset the values of length and width (individually and collectively), and get their values individually. There should also bebehavior to display the perimeters and area of the rectangle. Create another class named as Main which hastwo objects of Rectangle (r1, r2) having length (3.2, 20) and width (4.5, 36) respectively. Also displaythe length, width, perimeter and area of both rectangles.
"Create a class named Rock that acts as a superclass for rock samples collected and catalogued by a natural history museum. The Rock class contains fields for a number of samples, a description of the type of rock, and the weight of the rock in grams. Include a constructor that accepts parameters for the sample number and "weight. The Rock constructor sets the description value to Unclassified. Include get methods for each field. Create three child classes named IgneousRock, SedimentaryRock, and MetamorphicRock. The constructors for these classes require parameters for the sample number and weight. Search the Internet for a brief description of each rock type and assign it to the description field. Create an application that instantiates an object of each type and demonstrate that the methods work appropriately. Save the files as Rock.java, IgneousRock.java,SedimentaryRock.java, MetamorphicRock.java, and DemoRocks.java."
Write and document the definition for the Product class. The Product class represents an item that would appear for sale on a Web site or in a department store (like a toaster). Each Product object has three instance variables: description, productNumber and price. The class has one constructor that takes three parameters in the order productNumber, description and price. The class has one accessor method named getCost(int qty) which returns the price for qty items of the Product. The class has two mutator methods—setPrice() and setDescription()—that modify the corresponding instance variables. The class has a toString() method that returns the Product as a String in the form: 34567: Small Toaster, $ 17.95. Note: use concatenation to construct the returned string. Do not use the String.format() method to format the returned value.
Part A Create a FitnessTracker class that includes three data fields for a fitness activity: a String for the name of the activity as activity, an int for the number of minutes spent participating as minutes, and a LocalDate for the date as date. Create a default constructor that automatically sets the activity to running, the minutes to 0, and the date to January 1 of the current year. Overload the constructor so it receives parameters for each of the fields and assigns them appropriately. Includes methods to get each data field. Part B Create an application that instantiates two FitnessTracker objects. Prompt the user for values for one object, and pass those values to the three constructor parameters. Retain the default constructor values for the other object. Display the values for each object. An example of the program is shown below: Enter activity >> swimming Enter minutes spent swimming >> 90 Enter month >> 2 Enter day >> 24 Enter year >> 2021…
Part A Create a FitnessTracker class that includes three data fields for a fitness activity: a String for the name of the activity as activity, an int for the number of minutes spent participating as minutes, and a LocalDate for the date as date. Create a default constructor that automatically sets the activity to running, the minutes to 0, and the date to January 1 of the current year. Overload the constructor so it receives parameters for each of the fields and assigns them appropriately. Includes methods to get each data field. Part B Create an application that instantiates two FitnessTracker objects. Prompt the user for values for one object, and pass those values to the three constructor parameters. Retain the default constructor values for the other object. Display the values for each object. An example of the program is shown below: Enter activity >> swimming Enter minutes spent swimming >> 90 Enter month >> 2 Enter day >> 24 Enter year >> 2021…
Create a Shape class that shall have color and filled instance variables of enum Color and boolean type. The filled boolean variable shall show, whether the shape is filled (colored). The enum Color shall be defined within the class having 4 color names (choose any four). Also define getArea and getPerimeter method in Shape class, both shall return 0. Create Rectangle class with length and width attributes and a Circle class with radius attribute, of type double. Properly encapsulate all fields. Circle and Rectangle shall extend Shape class and override getArea and getPerimters methods as per its type and specific formula. In Test class, create an object of Rectangle and Circle, by initializing all attributes in constructor and print both shapes' area and perimters. In Test class, define a static method with following signature, public static void printEachShapeCount(Shape... shapes) As you know, the parent type variable can hold the reference of any child class object. That…
2-Create a class named 'Shape' with a method to print "This is This is shape".Then create two other classes named 'Rectangle', 'Circle' inheriting the Shapeclass, both having a method to print "This is rectangular shape" and "This iscircular shape" respectively. Create a subclass 'Square' of 'Rectangle' having amethod to print "Square is a rectangle". Now call the method of 'Shape' and'Rectangle' class by the object of 'Square' class.
QI. Write a program in BlueJ using the following hints. 1. Create a class named Book and declare the fields author, title and pages with suitable field types. 2. Declare the constructor and initialize the fields author and title with the assigned constructor parameter. 3. Name the constructor parameter as your own. 4. Add two accessor methods to the class getAuthor, getTitle and getPages—that return the author and title fields as their respective results. Add mutator method to change the pages of the Book class. 5. Add two methods, printAuthor and printTitle, to this Book class project. These should print the author and title fields, respectively, to the terminal window.