A c# code please see pictures for more details. there is also a sample output. NOTE THAT THIS IS A DUPLICATE QUESTION BECAUSE I NEED TWO ANSWERS THANKS ActivityInheritance and PolymorphismI. PROBLEM SOLVINGPerform 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 fromthe 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.LegendUser(+) - public(-)- privateuser_id: string(#) protected# user_password: stringitalicized - abstract members+ User(string id, string pass)+ verifyLogin(string id,string pass): bool+ updatePassword(string newPassword): voidAdministrator- admin_name: string+ Administrator (string name, string id,string pass)+ upatePassword(string newPassword): void+ updateAdminName(string name): void CPU Time: 0.02 sec(s), Memory: 16532 kilobyte(s)Enter your name: August DanaoEnter your ID number: 202021Enter your Password: AugustInformation DetailsName: August DanaoID number: 202021Password: AugustLogin Successul

Answered: A c# code please see pictures for more…

A c# code please see pictures for more details. there is also a sample output. NOTE THAT THIS IS A DUPLICATE QUESTION BECAUSE I NEED TWO ANSWERS THANKS

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Discuss the concept of multiple interfaces in a single class. What are the advantages and potential challenges of implementing multiple interfaces in a class?
Which (if any) of the following conditions are necessary for using polymorphism? Select all correct answers. The classes involved are in the same hierarchy. None of the classes can be abstract. All of the subclasses involved override the same method. The object reference cannot be of an interface type. An object reference of the superclass is used to call any methods. A superclass object is referenced by a subclass reference. Which of the following (if any) are true of abstract methods? Select all correct answers. Abstract methods must have a method body. Abstract methods cannot be declared in a class that isn't abstract itself. Abstract methods cannot be private or static. Abstract methods can only be declared in an interface. Abstract methods cannot be called. Constructor methods can be abstract.
Which (if any) of the following conditions are necessary for using polymorphism? Select all correct answers. The classes involved are in the same hierarchy. None of the classes can be abstract. All of the subclasses involved override the same method. The object reference cannot be of an interface type. An object reference of the superclass is used to call any methods. A superclass object is referenced by a subclass reference. Which of the following (if any) are true of abstract methods? Select all correct answers. Abstract methods must have a method body. Abstract methods cannot be declared in a class that isn't abstract itself. Abstract methods cannot be private or static. Abstract methods can only be declared in an interface. Abstract methods cannot be called.
When it is useful to use extension methods? Question 21 options: a) All the answers are correct b) when extending functionalities of an interface type c) When extending functionalities of classes that can't be inherited from (e.g. sealed classes) d) when extending functionalities of a third party library that we don't have access to the source code
(3) Briefly (in just a few words), describe the difference between an instance and a class
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2c) What are instance variables, and what role does the name ‘self’ play in thecontext of a class definition?
Consider an online holiday booking system. The users can register and log in to book a holiday package. The software development team is planning to apply the Gang of Four (GoF) Singleton pattern to the Security_Check class (as the Singleton class) which will monitor customers’ sign in activities. Which of the following is FALSE? Select one: a. The Security_Check class should provide a private method for the access of its object by external objects. b. The get method for the Security_Check object should be public. c. The Security_Check class should be responsible for creating one object to deal with different requests. d. The Security_Check class should have a private attribute for its object.
Assume the availability of an existing class, ICalculator , that models an integer arithmetic calculator and contains: an instance variable currentValue that stores the current int value of the calculator and can be accessed and modified by any subclass methods add , sub , mul , and div Each method in ICalculator receives an int argument and applies its operation to currentValue and returns the new value of currentValue . So, if currentValue has the value 8 and sub(6) is invoked then currentValue ends up with the value 2 , and 2 is returned. Write a public subclass, ICalculator2 , based on ICalculator . The class ICalculator2 has one additional method, negate , that receives no arguments. The effect of negate is to reverse the sign of currentValue . For example, if currentValue is zero, there is no change, if it is -22 then it becomes 22 , if it is 100 it becomes -100 . Furthermore negate returns the new value of currentValue Assume that variable…
TASK 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 RideRecord with the following attributes: a Driver attribute an enum called type of RideType a Date called date a double called fee A class called Passenger that extends the Person class and has the following attributes and behaviours: an ArrayList that contains RideRecord objects called rideHistory a public method called takeRide that takes a RideRecord with the following signature:public void takeRide(RideRecord rideRecord); a public boolean method called hasRideHistory that returns whether or not the Passenger has taken a ride before. A Driver class that extends the Person class and has the following attributes and behaviors: a String called licenseCode a public method called giveRide that takes as a parameter a Passenger…
UML diagram analysis: refer to the following UML diagram of the Loan Class. a) How many instance variables does the TV class have? b) How many methods that return a value does the TV class have? c) How many static methods does the TV class have? d) How many constructors does the TV class have? e) How many defaults data fields does the TV class have?