Regarding the information hiding principle; A: Briefly describe it. B: State the advantages. A: How to store information for a subdomain (member) in a class? Briefly describe that it is implemented (explain simply without writing code). D: Write a simple class that encapsulates but cannot store information.

What happens if you try to override a non-virtual or final method in a derived class?

QUESTION 16 What must be true of a class with one abstract method? O The class must also implement the Iterable interface Any derived class must implement the method The abstract method must have the static modifier O The method cannot specify a return value QUESTION 17 Suppose we wanted to design a set of classes for a veterinarian's office. Our Customer class looks like this: public class Customer { Pet [] pets; } Select all the statements that are true Once the size of the pets array has been set, it cannot be changed Because we're using an array, all pets must be the same A customer must have at least one pet We also need to declare a Pet class QUESTION 18 What is the proper use of an enumeration? To define a set of ordered values To enforce the use of the Comparable interface O To define, or enumerate, the values returned by a Random object generator O To define the classes in an inheritance hierarchy

So, what are "static members" of a class, exactly? To what extent and when may you benefit from them?

An object can be created from an abstract class is it true or false

Draw the following Class Structure as a (class digram):   1. NotificationSystem: This is the main class that manages the notification system. It has the following attributes and methods: - Attributes:   - users: a list of User objects representing all the users registered in the system   - tweets: a list of Tweet objects representing all the tweets posted in the system - Methods:   - register_user(user): adds a new user to the system   - post_tweet(user, message): posts a new tweet on behalf of a user   - get_timeline(user): returns a list of tweets from all users that the specified user follows   - get_mentions(user): returns a list of tweets that mention the specified user   2. User: This class represents a user in the system. It has the following attributes and methods: - Attributes:   - username: a string representing the username of the user   - followers: a list of User objects representing all users who follow this user   - following: a list of User objects representing all…

15. Suppose the class Employee is declared as follows: public class Employee { private String name; private double baseSalary: public void setName(String newName) {...} public void setBasSalary(double newSalary){...} public String getName() {...} public double getSalary({...} } a)Declare a class Manager that inherits from the class Employee and adds an instance variable bonus for storing a salary bonus. Omit constructors and methods. ANS: b) Which instance variables does the Manager class have? c) In the manager class, provide the method overrides the getSalary method from the class Employee so that it returns the sum of the salary and the bonus d) Based on the above question, which methods does the manager class inherit? e) In the manager class, override the getName method so that managers have a before their name (such as *John Smith).

True or false?(a) Every object is an instance of the object class.(b) If a class does not extend a superclass explicitly, it extends object by default.

To what use does it serve for a class to have its own destructor?

5. Is it compulsory for a class, which has been declared as abstract, to have at least one abstract method?