Given:abstract class A{int a;int b;}class B extends A{int a;}O cannot make class A abstractcan create an instance of both class A and class Bclass B must also be abstractO cannot make an instance of class A Given:interface B{void methodA();static void methodB();void hiethodC(){ }}methodC should not have a bodyO methodB should have a bodymethodB should not be staticO both a and c

Answer 1: A- cannot make class A abstract Abstract classes can not be instantiated.Answer 2: Method C should not have a body. Methods can not have a body as of Java 8

Answered: Given: abstract class A{ int a; int b;…

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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T/F 22) An abstract class can only be instantiated if at least half of its methods are defined
1. Employee and ProductionWorker Classes Write an Employee class that keeps data attributes for the following pieces of information: Employee name Employee number Next, write a class named ProductionWorker that is a subclass of the Employee class. The ProductionWorker class should keep data attributes for the following information: Shift number (an integer, such as 1, 2, or 3) Hourly pay rate The workday is divided into two shifts: day and night. The shift attribute will hold an integer value representing the shift that the employee works. The day shift is shift 1 and the night shift is shift 2. Write the appropriate accessor and mutator methods for each class. Once you have written the classes, write a program that creates an object of the ProductionWorker class and prompts the user to enter data for each of the object’s data attributes. Store the data in the object, then use the object’s accessor methods to retrieve it and display it on the screen. 2. ShiftSupervisor Class In a…
Given: interface B void methodA(); class C implements B { void methodB(){ } } everything is fine methodA should be overriden in class C O class C should be abstract O either b or c
8. Python concer # TODO: Define BankAccount class # TODO: Define constructor with parameters to initialize instance attributes # TODO: Define deposit_checking() # TODO: Define deposit_savings() # TODO: Define withdraw_checking() # TODO: Define withdraw_savings() # TODO: Define transfer_to_savings() if __name__ == "__main__": account = BankAccount("Mickey", 500.00, 1000.00) account.checking_balance = 500 account.savings_balance = 500 account.withdraw_savings(100) account.withdraw_checking(100) account.transfer_to_savings(300) print(account.name) print('${:.2f}'.format(account.checking_balance)) print('${:.2f}'.format(account.savings_balance.
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).
Question 1 O instance A class that passes its attributes and methods on to another class is referred to as a(n). subclass inheritance esc base class SAVE & CONTINUE Report an issue with this question FI F2 9.0 F3 1 2 ODD DOD F4 3 O Mark this question 4 FS 5 3..
Class B is a protected base class of class D. Protected members of the base class B are O not accessible by the member functions of class D O inherited as protected members of the class D O None of these O inherited as public members of the class D
Overview Construct a hierarchy of classes representing savings and checking accounts as well as a means to ‘filter’ account objects. Account Classes Your solution will consist of 4 account classes as described below. It is your responsibility to define the exact relationship among those classes and translate that relationship into source code structure. There is a correct structure; the skeleton must be modified to reflect the correct relationships.  Account – represents a general account with basic operations such as deposit, withdraw, etc.  Savings – represents a savings account that must maintain a minimum balance.  Checking – represents a checking account that has no minimum balance (this means a zero balance).  CappedChecking – represents a checking account that disallows a balance above a particular maximum value. Linking Accounts A bank or credit typically allows a user the ability to link accounts together. That is, I might wish to link my checking account with my savings…
6. Given: class Pet { public: virtual void eat() { cout eat(); } What is the result of compiling and running the above program? m. The program compiles and crashes when it runs. i. The program compiles and runs, printing "Pet::eat" j. The program compiles and runs, printing "Cat::eat" The program compiles and runs to completion without printing anything. n. o. None of the above. k. The program fails to compile because the method eat is not marked virtual in Cat. I. The program fails to compile for some other reason.
Modify and rewrite the Food class to an abstract class, so that no instance of Food class can be created
In what kinds of situations would you find it more beneficial to make use of an abstract class as opposed to a base class?

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