03. What is an abstract class?.
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03.
What is an abstract class?.
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- Question:: What is an abstract class?Write an essay that answers the question: what is the difference between a class and an abstract class?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.
- Lab 6 - Preparation Questions ITDR2104 - Programming Lab 6 - Preparation Questions Student ID: Student Name: Group No.: All the questions should be completed before the start of lab-7 session. Write your answers in the space provided. 1. Can you declare a class that contains abstract methods a non-abstract class? 2. Can you declare an abstract class that contains no abstract methods? 3. Can objects be created from abstract class? 4. What is an interface?7. How you can make a class an immutable class?Make 3 choices. Which of the following are incorrect? Select 3 correct answer(s) An abstract class contains constructors. The constructors in an abstract class should be protected. The constructors in an abstract class are private. You may declare a final abstract class. An interface may contain constructors.
- 246. The process of forming a new class from an existing class. a. Abstraction b. Polymorphism c. Inheritance d. Implementation5. Is it compulsory for a class, which has been declared as abstract, to have at least one abstract method?A subclass of an abstract class must be able to do all of the things the parent class can do. True or not?
- Design and implementation of Java (Draw UML) classes 1. Design a class named Bill to represent a square. 2. The class contains: • One data field called “Items” that defines the number of items. Another double data field called "price" defines the price. The default is 1.0. • no-arg constructor • constructor with parameters to create the invoice • method called getBill () that returns the item and price duplication. 3. Create a class and test a class (create three different objects and print the values of the variables and method)Activity Inheritance and Polymorphism I. PROBLEM SOLVING Perform what is being asked. Write your code on a clean sheet of paper. 1. Create two (2) classes named User and Administrator. The Administrator class should inherit from the User class and the two (2) classes should be members of the namespace named UserNamespace. Refer to the UML class diagram below for the names of the required instance variables, methods, modifiers, and their types. Use the Equals() method to compare strings. Legend User (+) - public (-) - private (#) user_id: string protected # user_password: string italicized - abstract members + User(string id, string pass) + verifyLogin(string id, string pass): bool + updatePassword(string newPassword): void Administrator admin_name: string + Administrator (string name, string id, string pass) + upatePassword (string newPassword): void + updateAdminName(string name): voidAbstract classes and interfaces may be used interchangeably to specify the behavior of objects.How do you know whether you need an interface or an abstract class?