For which of these visibility modifiers, the attributes and methods of a super class be accesse from the subclass? O a. Protected O b. Private O c. Void
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O b. Private
O c. Void
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- QUESTION 2 What is the scope of a private instance variable? O Only the method in which the variable is defined. O The entire class in which the variable is defined. O All classes in the same package as the class in which the variable is defined. O The entire program. QUESTION 3 All Enumeration types are variable type O True O False QUESTION 4 A constructor cannot: O Specify return types or return values. O Initialize variables to their defaults. O Be overloaded. O Have the same name as the class. Click Save and Submit to save and submit. Click Save All Answers to save all answers. 33°C yubWhat is the design pattern depicted in the diagram below? The intent of this design pattern is to define an interface for creating an object, but let subclasses decide which class to instantiate. It lets a class defer instantiation to subclasses. Client Abstraction normalMethodoe BmakeObjecto Product do some stuff aProduct = makeObjecto: f do some more stuff -aProduct Product ConcreteOne ConcreteTwo makeObjecto : Product ProductOne ProductTwo return new ProductOneo. A. Factory Method Design Pattern B. Singleton Design Pattern C. Proxy Design Pattern D. Adapter Design PatternIf class A is a subclass of class B, then A has access to all of B's instance variables, including private ones. True False
- You cannot instantiate an interface but you can do so to an abstract class. True FalseJava Program This assignment requires one project with two classes. Class Employee Class Employee- I will attach the code for this: //Import the required packages. import java.text.DecimalFormat; import java.text.NumberFormat; //Define the employee class. class Employee { //Define the data members. private String id, lastName, firstName; private int salary; //Create the constructor. public Employee(String id, String lastName, String firstName, int salary) { this.id = id; this.lastName = lastName; this.firstName = firstName; this.salary = salary; } //Define the getter methods. public String getId() { return id; } public String getLastName() { return lastName; } public String getFirstName() { return firstName; } public int getSalary() { return salary; } //Define the method to return the employee details. @Override public String toString() { //Use number format and decimal format //to…If you assign a new instance of a subclass object to a super-class variable without casting, what will happen when you compile your code? A warning will appear Ob A ClassCastException will occur O c. A compile error will occur Od Will be fine
- Which of the following is true regarding abstract classes or abstract methods? (Select all that apply) All methods in an abstract class must be overriden and implemented in any of its subclasses. Abstract classes only become useful when we create objects from them. Abstract classes only become useful when they are extended. Abstract methods must be overridenBooks 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.Which of the following is the correct way to call the constructor of the parent class? Select one: a. this.call) O b. super0 O c. this) O d. super.callO Clear my choice Which of the following class declaration is not allowed to be instantiated? Select one: O a. public class Person {} O b. public abstract class Person {} O c. class Person{} O d. None of these O e. public final class Person {} Clear my choice
- B1. Given the following classes, answer the below questions. 1. Person (abstract class) that has the following: Data Fields: private String name, private String address Constructor: Constructor to create a Person object with specified name and address. Methods: Accessor and mutator methods for all data fields. 2. Student (extend the class Person) that has the following: Data Fields: private int ID, private double grade Constructor: Constructor to create a Student object with specified name, address, ID & grade. Methods: Accessor and mutator methods for all data fields. 3. Director (extend the class Person) that has the following: Data Fields: private double salary. Constructor: Constructor to create a Director object with specified name, address, and salary. Methods: Accessor and mutator methods for salary data field. 4. GraduateStudent(extend the class Student) that has the following: Data Fields: - Constructor: Constructor to create a GraduateStudent object with specified name,…Task 2: Vehicles and Stations Now we want to test our docking interface, but first we want to define an abstract class for our vehicles from which we will model all of our designs after. Instructions 1. Create an abstract class called Vehicle that has the following properties: . a private attribute called name of type String a protected attribute called chargeRemaining of type double • a protected attribute called maxChargeCapacity of type double appropriate getters/setters for the attributes. ● an abstract method called print Info an abstract method called calculateTotalCharge Needed that re- turns a double 2. Create a class called ChargingStation that uses the Dockable interface 3. Make sure that the ChargingStation class has the following properties: . a private array of Vehicle objects that represents the docked vehicles - The index of each object represents its docking number/bay 4. Implement all of the necessary methods in ChargingStation • canDock returns true if there is space…Java Program This assignment requires one project with two classes. Class Employee Class Employee- I will attach the code for this: //Import the required packages. import java.text.DecimalFormat; import java.text.NumberFormat; //Define the employee class. class Employee { //Define the data members. private String id, lastName, firstName; private int salary; //Create the constructor. public Employee(String id, String lastName, String firstName, int salary) { this.id = id; this.lastName = lastName; this.firstName = firstName; this.salary = salary; } //Define the getter methods. public String getId() { return id; } public String getLastName() { return lastName; } public String getFirstName() { return firstName; } public int getSalary() { return salary; } //Define the method to return the employee details. @Override public String toString() { //Use number format and decimal format //to…
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