QUESTION 5 All methods in an abstract class must also be declared abstract. O True False
Q: 10 A class has to necessarily be declared as abstract class if
A: Required:
Q: Can we use a default constructor of a class even if an explicit constructor is defined?
A: 1) The default constructor is the no-argument constructor automatically generated unless you define…
Q: Question.20. Can a class be declared with a protected modifier. i. True ii. False
A: Question.20. Can a class be declared with a protected modifier. i. True ii. False
Q: QUESTION 17 Which of the following are incorrect? (Choose all that apply) A. You may declare a final…
A: Abstract class: In object-oriented programming a class which is declared with abstract keyword is…
Q: Differentiate between abstract and concrete classes. Give examples from the scenario above
A: Please refer below for your reference: abstract and concrete classes differences are below:…
Q: Question 2: Both abstract classes and interfaces can be used for inheritance. a. Describe the…
A: Given: To write the differences between abstract classes and interfaces.
Q: If a class is abstract, what cannot be done with the class?
A: If a class is abstract, it implies that the class desires to hide the implementation details of it.…
Q: Question 5 public class Person { public void print () { System.out.println("In - Person"); } class…
A: Output for the given code with explanation is given below.
Q: Question 19 Private fields are variables that class users can access but member methods can not.…
A: Answer for question 17 is option A i.e. java.lang.Object Explanation- All classes in java are…
Q: Vehicle is an abstract class, Car is a subclass of Vehicle. Both Vehicle and Car classes have…
A: Vehicle is an abstract class, Car is a subclass of Vehicle. Both Vehicle and Car classes have…
Q: True or False Properties in a base class cannot be overridden in the same way that methods can be…
A: The answer is given below,
Q: True or False: In order to derive class A from class B, class A must contain a public member…
A: Here is the solution :
Q: Solve within 30 minutes avoid plagiarism make it different.
A: A static method is a method that belongs to a class, but it does not belong to an instance of that…
Q: Explain the difference between the private and protected members of a class.
A:
Q: A derived class has access to all of the methods of the parent class, but only to the protected or…
A: I have provided a solution in step2.
Q: Explain briefly about abstract class and concrete class with examples. Also write when do vou go for…
A: Answer : Abstract class : It is used as a base class from which you can derived other class. It is…
Q: Question 1: Consider the following declarations: class xClass public: void func(); void print();…
A: NOTE : As per Bartleby guidelines, we as Subject Matter Experts are supposed to solve only the first…
Q: QUESTION 1 Constructors are automatically inherited when we extend a class. O True False
A: As per our guidelines we are supposed to answer only one question. Kindly repost the remaining…
Q: s) of a class Company.
A: Identification of Member variables and Member methods - These are also a simple variable and…
Q: 13 - Regarding to the abstract class/abstract methods, which one of the following is False ? I) A…
A: Abstraction is the technique of showing only essential functionalities of a class to the user, where…
Q: Object Oriented Programming Answer the following questions to assess your learning for const keyword…
A: Yes, we can access constant data member of a class from a non-constant member function of the same…
Q: Object Oriented Programing Consider the following details of all classes: Person Student…
A: Given conditions : A person can be an employee or a student. An employee may have rights of admin…
Q: An abstract class can only be instantiated if at least half of its methods are defined
A: The answer for the given statement is as follows:-
Q: QUESTION 1 Static fields in a class O can be referenced as a field of any instance of the class. O…
A: The suitable option is (a).
Q: Which of these is not a correct statement about abstract class? a. Every class containing abstract…
A: Abstract Classes are the classes that contain 0 or more abstract methods
Q: Write the code below for the Computer class. The Computer class must be an abstract class, and have…
A: As no programming language is mentioned, it is solved using basic Java
Q: 1. Complete the partial declaration of Class Car: public class Car { // declare three private…
A: Given :
Q: When deriving a class from a base class with public inheritance, public members of the base class…
A: When a class is derived from a base class, the base class can be inherited mainly through public,…
Q: Given the following diagram: 1 Customer Account • Account class is having 2 attributes: int id and…
A: Program a. class Account { privatedouble balance; privateint id; // constructor public…
Q: Design a class named Customer with field holding for customer's name, address, and telephone number.…
A: public class Customer { //declaring variables private String name; private String address;…
Q: What is the purpose of an abstract class?
A: Abstract class: To make any class as an abstract class the programmer needs to use the abstract…
Q: 4. Given, an abstract class as the following: abstract class Test{ abstract void add(); } Which one…
A: Answer: The right choice is option b.new Test() ; Simply in the given question right option b is…
Q: Differentiate between static and instance class members. Explain with proper example when you should…
A: Instance variables Static (class) variables Instance variables are declared in a class, but…
Q: QUESTION 7 A special method that is executed automatically when the class is instantiated. O a.…
A: Getter and Setter are used to get and set data to class variables. These methods has to be called…
Q: When a concrete class inherits from an abstract class, you have to implement all abstract methods…
A: If we define any class an abstract class that means it contains some abstract or non abstract method…
Q: 1. Complete the partial declaration of Class Car: public class Car { // declare three private…
A: public class Car { //declaring private instance variables private String color; private String…
Q: (b) The class diagram below shows the relation of three classes of a program. The class Employee is…
A: I have implemented the given requirements as per the specification. The code is as follows:…
Q: A(n) __________ is a method that appears in a base class but expects to be overridden in a derived…
A: Abstract class: An abstract class is a class that acts as a base class for a derived class that may…
Q: Why would a class be declared as abstract?
A: REASONS TO DECLARE THE CLASS AS ABSTRACT: Abstract class are used for the purpose of providing…
Q: True or False, An abstract class must have at least one abstract method.
A: An abstract class is defined as a class which contains 0 or more abstract methods. If it contains…
Q: Q4. Write the class definition and draw the class diagram for the following: Class Name Bank…
A: public class Bank{ private String Bname; private String code; public long Phone; public…
Q: Given the below program, explain why the bold text below is INVALID. abstract class Employee(…
A: Here in the given code, we have an abstract class named Employee with one abstract method…
Q: Question 17) A variable declared to be of one class can later reference an extended class of that…
A: Given that, 17) A variable declared to be of one class can later reference an extended of that…
Q: If a class inheriting an abstract class does not define all of its functions then it is known as?…
A: HELLO THEREI AM ADDING ANSWER BELOW PLEASE GO THROUGH IT THANK YOU
OOPs
In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.
Constructor
The easiest way to think of a constructor in object-oriented programming (OOP) languages is:
Step by step
Solved in 2 steps
- Create a project Vehicles in bluej. The project has Cars, Buses ,Trucks and Bikesclasses ,all these classes inherit from an interface Vehicle. Pedal_bikesand Motor_bikesare subclasses of abstract class Bikes. A.Show the relationship(class diagrams)between above mentioned classesand interfacesand write the necessary class definitions. B.Interface should have 3 methods: drive(), start() and stop(). C.abstract class Bikesshould have 2abstract methods: speed( ) and getModel( ). D.Which one of the following assignments are legal, why or why not? Justify. Pedal_bikes bik= new Motor_bikes( ); Vehiclev1 = new Buses (); Bikesbi= new Bikes( ) please use BlueJ program.1. Define an interface Measurable. It has a single abstract method: double getArea(); 2. Define an abstract class Shape which has two fields: type and name both of type Strin a. Provide constructor with a single input parameter: name. b. Provide accessor methods for both fields. C. Provide setter method for name. d. Provide toString() method that simply returns the "(type): (name)" e. Shape class implements Measurable interface without implementing its only abs method. 3.True or False ___(7) An object can be created from an interface. ___(8) An object in a super class can be assigned to a subclass variable. ___(9) Overriding and overloading a method is the same.
- Q2. Write a program (Abstract+Interface) Define a class named Point containing: Two private instance variables x and y of type int. A full parametrized constructor Getters for all instance variables Define an abstract class named Shape containing: An instance variable named s of type Point. A full parametrized constructor A method named getS that returns the value of instance variable An abstract method named Area that has a return type double. Define an interface named Printable containing a method print without parameters and returning void. Define a class named Rectangle which is extended from class Shape, implements the interface printable and containing: Three instance variables named Length, Width of type int and an instance variable named d of type Point. A constructor with two parameters of type Point which initializes all the instance variables. The lengthis the difference in y-coordinates of any top and bottom point. length= Math.abs(s.getY()-d.getY()); The…Create an abstract NewspaperSubscription class with fields for the subscriber name, address, and rate. Include get and set methods for the name field and get methods for the address and subscription rate; the setAddress() method is abstract. Create two subclasses named PhysicalNewspaperSubscription and OnlineNewspaperSubscription. The parameter for the setAddress() method of the PhysicalNewspaperSubscription class must contain at least one digit; otherwise, an error message is displayed and the subscription rate is set to 0. If the address is valid, the subscription rate is assigned $15. The parameter for the setAddress() method of the OnlineNewspaperSubscription class must contain an at sign (@) or an error message is displayed. If the address is valid, the subscription rate is assigned $9. Finally, write an application that declares several objects of both subscription subtypes and displays their data fieldsCreate an abstract class Product with following Properties Price (Decimal), Code (string), Description (string) Create an interface ISellable with the following Method sell that takes the count of the products to sell and returns the cost public decimal sell(int count); Create a concrete class Book that Inherits from class Product and implements interface ISellable Has additional Property Author (string) Add a constructor with parameters, and ToString method to display all of data of class Book Similarly, create anot concrete class Software that Inherits from class Product and implements interface ISellable Has additional Property Version (string) Add a constructor with parameters, and ToString method to display all of data of the class Software Finally, write a client code (main program) that will utilize the class and interface hierarchy you created. Create two Book objects for the following books C# 8.0 in a Nutshell, with price $50.99 and with ISBN…
- This is the question - Create an abstract NewspaperSubscription class with fields for the subscriber name, address, and rate. Include get and set methods for the name field and get methods for the address and subscription rate; the setAddress() method is abstract. Create two subclasses named PhysicalNewspaperSubscription and OnlineNewspaperSubscription. The parameter for the setAddress() method of the PhysicalNewspaperSubscription class must contain at least one digit; otherwise, an error message is displayed and the subscription rate is set to 0. If the address is valid, the subscription rate is assigned $15. The parameter for the setAddress() method of the OnlineNewspaperSubscription class must contain an at sign (@) or an error message is displayed. If the address is valid, the subscription rate is assigned $9. Code I was given - public class DemoSubscriptions { public static void main(String args[]) { PhysicalNewspaperSubscription pnsGood = new…True or False ___(1) An abstract class can have fields. ___(2) You can create an object from an abstract class _ _(3) An abstract class can have both abstract methods and methods that have method bodyWrite a class named Employee which implements Comparable Interface with name and salary as data field. Add a constructor with argument name and salary. Add getter and Setter for name and salary. Add CompareTo() method for the data Name. Write a class named Manager which inherits the Employee class. Add an instance variable, named department, of type String. Add a constructor in the subclass class with arguments name, salary, department and a toString() method that prints the manager’s name, department, and salary [Hint: Add a toString( ) method in the super class as well] Create 3 objects of Manager with following arguments 1. (Zayed, 500), 2. ( Ahmed, 700) 3. ( Faisal, 600) Create an Array object Add the above 3 objects into an Array object and Sort by Name and Display Create an object Employee class with argument (Zayed, 500, IT) Display the 1. Name 2. Salary 3. Department by using tostring() method.
- When a class implements an interface with default methods and overrides them, the class inherits the default methods’ implementations. An interface’s designer can now evolve an interface by adding new default and static methods without breaking existing code that implements the interface. State whether the statement is true or false. If false, explain why.What is an abstract class? Choose only one option.(a) An object(b) A class with no methods.(c) A class with no concrete subclasses.(d) A class with at least one undefined message.(e) An interface.Common object behavior can be expressed using interfaces or abstract classes.What elements should you take into account when choosing between using an interface and an abstract class?
