What is the keyword that tells the compiler that a class is inheriting from another class? abstract base derived extends inherit interface parent poly sub
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- 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.Create a parent class Person with one attribute age and one method greet() that prints out "Hello, world!". By default, the age is 20. Then create a subclass CollegeStudent that inherits from Person and has its own attributes School_Name and Major. Then create an object (a college student, his name is Harry, age is 21, School_Name is "Felician University", and Major is "Computer Science"), then let Harry say"Hello World!".Write a java code that: a) Creates an abstract method in a superclass, then overrides it in a subclass. (Only show the methods in both classes). b) Provides a method PrintInfo () that prints your group info and can be used only in classes of the same package. c) Provides a non-overridden area() that calculates area. (choose a shape)
- Write a superclass called ؛Person (as shown in the class diagram), whichcontains:• Two instance variables name (String) and address (String).• Two constructors: a (no-argument) constructor that initializes the name to "Ahmed"and address to “Gaza”, and a constructor that initializes the name and address tothe given values.• Getter and setter for all the instance variables.• A toString() method that returns "A Person with name of xxx and addressof yyyWrite a test program to test all the methods defined in Person.Write two subclasses of Person called Student and Staff, as shown in the class diagram.The Student class contains:• An instances variable program (String), year(int) and fee(double) .• One constructor as shown.• Getter and setter for the instances variable program , year and fee.• Override the toString() method inherited, to return "A Student with [name,address],[program,year and fee].The Staff class contains:• Two instance variables school (String) and pay (double).• One…Create a new class called AdvancedMath that implementmyMath interface, which have following methods like sqr(),round(), floor(). These methods have to be implemented byAdvancedMath class.Write a java program Write a class named Employee with name and salary as private data fields. Add a constructor with both parameters. Write a class named Manager which unherits the Employee class. Add an instance variable, named department, of type String and 15 private. Add a constructor in the subclass class and a toString () method that prints the manager's name, department, and salary [Hint: Add a tastanel) method in the super class as well]. Create objects of Manager and Employee dass
- answer for task 2 only the question also refers to some of the stuff on task 1 skip 1 Draw the UML class diagrams for the following classes: An abstract Java class called Person that has the following attributes: a String called idNumber a Date called dateOfBirth representing the date of birth. a String for name A class called VaccineRecord with the following attributes: an enum called type of VaccineType a Date called date a String called batchCode A class called Patient that extends the Person class and has the following attributes and behaviours: an ArrayList that contains VaccineRecord objects called vaccinationRecord a public method called vaccinate that takes a VaccineRecord with the following signature: public void vaccinate(VaccineRecord vaccineRecord); a public boolean method called isVaccinated that returns whether or not the Patient has had a vaccine. A MedicalPractitioner class that extends the Person class and has the following attributes and behaviours: a…The xxx_Pet classA Pet has a:– Name• Include an instance variable• Getters and setters for an instance variable• A toString method which returns a String containing the pet name Abstract methods: speak() and move()The subclassesWrite a dog, cat, snake subclasses with proper instant variables and methodsWrite a class xxx_TestPet which will1- Create a dog, a snake, and a cat objectsSample OutputPet Fido is a dog, weighing 45 poundsFido says woofrun Fido runPet Sam is a snake, 30 inches longSam says hissslither Sam slitherPet Hershey is a cat, with Long hairHershey says Meowprance Hershey prance2- Print just the weight of the Dog, the length of the Snake and the hair length of theCat as shown belowFido weighs 45 poundsSam has length 30 inchesHershey has Long hair 3- Store the objects in an Array of Pet objects and print the information belowPet D1 is a dog, weighing 55 poundswoofrunPet S1 is a snake, 30 inches longhissslitherPet C1 is a cat, with Long hairmeowprancePet D2 is a dog,…Which of the following does NOT apply to the strategy design pattern? It can change the behavior of a class at runtime It can eliminate conditional statements It can reduce the communication overhead between objects It provides an alternative to subclassing None of above
- What methods are polymorphic in the Employee Hierarchy? How could we build a method like getRandShape() above but for use with Employees? If we built a getRandomEmployee() method that returns various Employee subclass objects; write a few lines of code that would demonstrate late binding /* * Employee.java - Abstract * This is the superclass of all workers in this company * All employees must have a name and social security number. */ //notice the abstract keyword? That prevents us from making objects of this type! public abstract class Employee { private String name; privateintsocial; public Employee() { } public Employee(String newName, int newSocial) { name = newName; social = newSocial; } public String getName() { returnname; } publicvoid setName(String name) { this.name = name; } publicint getSocial() { returnsocial; } publicvoid setSocial(int social) { this.social = social; } publicabstractdouble calculateWeeklyPay(); }If A and B are reference variables to the objects of MyClass, what can we say aboutthis comparison? (Pick all true statements.)if (A.equals(B)) {...} A. It is identity test.B. It checks whether two objects are equal if the equals method is overridden in MyClass.C. None is correct.D. It checks whether both are referring to the same object if the equals method is not overriddenin MyClass.What is the output of the following code where Student is a subclass of Person class? Person s = new Student(); if (s instanceof Student) { System.out.print("This is a student ”); } else { System.out.print("This is a person ”); } This is a student This is a person This is a student This is a person Syntax error