class Circle: def -_init__(self, r= 3): self.radius = r 4 def get_radius(self): return self.radius 7 8. 6. For the class above reply to the following questions: 1) Create an object with radius=5 2) Now, change the radius of the same object to 10 3) What you will change to hide the data-field radius? Mention line# and change you will make to do so. 4) When the radius is hidden/private, how its radius should be updated? Write a function below that should be added as a method to the class to do so. 5) What will be the output of the following instructions: H23

class Circle: def -_init__(self, r= 3): self.radius = r 4 def get_radius(self): return self.radius 7 8. 6. For the class above reply to the following questions: 1) Create an object with radius=5 2) Now, change the radius of the same object to 10 3) What you will change to hide the data-field radius? Mention line# and change you will make to do so. 4) When the radius is hidden/private, how its radius should be updated? Write a function below that should be added as a method to the class to do so. 5) What will be the output of the following instructions: H23

EBK JAVA PROGRAMMING

9th Edition

ISBN:9781337671385

Author:FARRELL

Publisher:FARRELL

Chapter10: Introduction To Inheritance

Section: Chapter Questions

Problem 1PE

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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.
Use the code provided copied to a new file named compulsory_task_1.py: 1. Add another method in the Course class that prints the head office location: Woodstock, Cape Town2. Create a subclass of the Course class named OOPCourse3. Create a constructor that initialises the following attributes and assigns these values: --- "description" with a value "OOP Fundamentals" --- "trainer" with a value "Mr Anon A. Mouse"4. Create a method in the subclass named "trainer_details" that prints what the course is about and the name of the trainer by using the description and trainer attributes.5. Create a method in the subclass named "show_course_id" that prints the ID number of the course: #123456. Create an object of the subclass called course_1 and call the following methods contact_details trainer_details show_course_id These methods should all print out the correct information to the terminal On a side note, this task covers single inheritance. multiple inheritance is also…
Java Question Create a class named "Identity" class with attributes: name, age, city and gender. Choose your own data type (int, string etc.). Create 4 different methods; eat, study, sleep and play. Make each of them Print something like “I am sleeping”.In main driver class create object of a class with default constructor. Create two objects as shown in the image. Then call all methods of a class (eat, study, sleep and play).Add toString method displaying all attributes (name, age, city and gender). Add setters and getters for each attribute. Print each attributes from main program with getters.
Create a TeeShirt class for Lebo’s Tee Shirt Company. Attributes include an order number, size, color, and price. Create set methods for the order number, size, and color and get methods for all four attributes. The price is determined by the size: R122.99 for XXL or XXXL, and R109.99 for all other sizes. Create a subclass named CustomTee that descends from TeeShirt and includes an attribute to hold the slogan requested for the shirt, and include get and set methods this field. The display() method should me an abstract method. Write a test class named DemoTees.java that creates two objects of each class, and demonstrate that all the methods work correctly by communicating to the user to input the tee shirt size, color, and slogan, then display the tee shirt order number, size, color, slogan and price. Format your output to 2 decimal places. The user should be asked to repeat the process or not, (y) indicates yes they want to repeat the process an the process repeats and (n)…
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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.
Books can come in various formats, like paper books, audio books, ebooks, etc. Create a generic classBook that has as common attributes the title, the year of publication, and the author. The constructor of thisclass should instantiate all three attributes. Override the toString method of class Book that returns a stringthat contains the values of its attributes. Create a subclass PrintBook that extends Book with attributesPublisher and ISBN. Create another subclass AudioBook which has the book’s size (in MB), its playlength and the playback artist’s name as attributes. Both PrintBook and AudioBook classes override thetoString method inherited from Book. Write a Java application to demonstrate the usage of this hierarchy.
Test your newly created subclasses inside the same TestComputer program you previouslycreated: create two new Laptops and two new Desktops with the data of your choice. UsetoString() method to show all data fields (including the data fields in the super class and sub class)Hint: Make sure to avoid redundancy in your code – no fields implemented in the Parent Classshould be repeated/reimplemented/redefined in children. package project2;class Desktop extends Computer { private int width; private int height; public Desktop() { super(); width = height = 0; } public Desktop(String manufacturer, String diskSize, String manufacturingDate, int numberOfCores, int width, int height) { super(manufacturer, diskSize, manufacturingDate, numberOfCores); this.width = width; this.height = height; } public int getWidth() { return width; } public int getHeight() { return height; } public void setWidth(int width) {…
Create a class Car with parameters companyName, color, maxSpeed (Not more than 150) andcategory. Use appropriate data types and access specifiers. Use default constructor to create objectsof cars. Write methods to set and get the values of parameters of car. Write methods to find categoryof car and to display the complete details of car along with category. Create another class TestCarwhich creates array of n number of cars, uses appropriate set methods to set the values of parametersof every car. Display the details of each car. (If max speed is between 120 and 150 then category is“High speed” otherwise “Normal”) (JAVA)
User: Make a class called User. Create two attributes called first_name and last_name,and then create several other attributes that are typically stored in a user profile. Makea method called desctibe_user() that prints a summary of the user's information. Makeanother method called greet_user() that prints a personalized greeting to the user.Then - Create several instances representing different users, and call both methods for each user. Admin: Write a class called Admin that inherits from the User class. Add an attribute,privileges, that stores a list of strings like "can add post”, "can delete post”, "can banuser”, and so on. Write a method called show_privileges() that lists the administrator'sset of privileges. Then - Create an instance of Admin, and call your method.
1. Create a class called Student, with the following attributes/variables:a. studentName (String)b. studentNumber (int)sc. regYear(long)d. faculty(String)e. department(String)2. Add the following methods in Student:a. accessors and mutators for all variablesb. toString methodi. Formulate your toString so that it only shows studentName,studentNumber and faculty3. Create a class called MyFriends, with the following attributes variables:a. studentArray(Student[])4. Add the following methods in MyFriends:a. fillArrayi. Using scanner ask how many students does the user want to inputii. Capture user input for all of his friends(Of course we are assuming all your friends would be similarUWC students, go ask around and meet new friends, alsopreferably not in the same Computer Science department … ifpossible … only if possible)b. maini. Call the fillArray methodii. Count how many Computer Science studentsiii. If half or more students are Computer Science students, thendisplay “You … need more…
Create a class named Poem that contains the following fields: title - the name of the poem (of type String) lines - the number of lines in the poem (of type int) Include a constructor that requires values for both fields. Also include get methods to retrieve field values. Create three subclasses: Couplet, Limerick, and Haiku. The constructor for each subclass requires only a title; the lines field is set using a constant value. A couplet has two lines, a limerick has five lines, and a haiku has three lines. ***Can I also get an explaination for each step thank you so much for all of your help ^_^**** import java.util.*; public class DemoPoems { public static void main(String[] args) { Poem poem1 = new Poem("The Raven", 84); Couplet poem2 = new Couplet("True Wit"); Limerick poem3 = new Limerick("There was an Old Man with a Beard"); Haiku poem4 = new Haiku("The Wren"); display(poem1); display(poem2); display(poem3);…