7. Which of the following is true about inheritance? Inheritance allows a child instance to access properties from a parent instance. Inheritance allows a parent class to extend the expected behavior of a child class Inheritance refers to when classes receive the properties and methods of their parent class. Inheritance is used to instantiate a clone of a parent object. 8. When would you use a static method over an instance method? When the method's return value is immutable When the class is declared as a static class When overriding an inherited method from a parent class When the method acts on the entire class, not just one object instance

7. Which of the following is true about inheritance? Inheritance allows a child instance to access properties from a parent instance. Inheritance allows a parent class to extend the expected behavior of a child class Inheritance refers to when classes receive the properties and methods of their parent class. Inheritance is used to instantiate a clone of a parent object. 8. When would you use a static method over an instance method? When the method's return value is immutable When the class is declared as a static class When overriding an inherited method from a parent class When the method acts on the entire class, not just one object instance

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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When a concrete class inherits from an abstract class, you have to implement all abstract methods declared in the super class before you can instantiate it (the concrete class). True False
Classes: Write a Person class that has these attributes: person_ID, first and last names, and age Default and overloaded constructors Accessors and mutators equals method toString method (make this virtual if C++, don't forget to prep the class for polymorphism) Inheritance: Create a child class to Person called Student: Attributes: GPA and status (freshman, sophomore, junior, senior, graduate, graduated). Make sure you have appropriate accessor/mutator methods Create another child class to represent Faculty. This class will have faculty rank and length of service as attributes along with an office location. Again, add methods as needed. Application Create an application that displays a menu that allows users to add students or faculty, or print either one or exit. Deliverable: Submit your source code and classes on Github (you will be supplied an account) You will also submit a Word document and your code on Canvas. In the document you iwll write a summary of your design…
True or False A child class cannot override the parent’s definition of an inherited method.
When the inheritance is private, then the private members/methods of parent class are in the child class. Select one: a.public b.protected c.inaccessible d.private
Object passing checklist1. Go over each member function and add the const keyword after their declaration ifthey do not modify any of the class' member variables.2. When accepting objects as parameters, prefer to pass them by reference. Add reference declarator (& before the identifier name of an object parameter.3. If the member function does not modify the parameter, make the parameter constantby using the const keyword. apply the Object Passing Checklist. Modify food.h and volunteer.h to useobject references. Add const and & keywords in the appropriate places of the code.
Making sure that encapsulation is not violated (i.e., instance variables must be private); design an inheritance hierarchy of classes Car, Truck, and Vehicle based on the following description. Car is a Vehicle. Truck is a Vehicle. (a) Definition of class Vehicle Instance variables: year that holds the year of vehicle (int) make that holds the make of vehicle (string) Methods: a default constructor with no arguments. a second constructor that accepts the Vehicle's year and the make as arguments. These values should be assigned to the object's instance variables: year and make. A copy constructor that accepts an existing vehicle object reference as argument and copies the values of instance variables to the newly created object. Accessor methods (getYear() and getMake()) that get the values of instance variables. Mutator methods (setYear(int) and setMake(String)) that set the values of instance variables. toString() should return a…
Select the class relationship that best describes the following scenario: • Class A accepts an instance of Class B as a parameter in one of its methods. • Class A then uses one of the Class B's methods. Association (Reflexive) Association (Bidirectional) Association (Directed A to B) Association (Directed B to A) Composition (A as the whole and B as the part) Composition (B as the whole and A as the part) Aggregation (A as the whole and B as the part) Aggregation (B as the whole and A as the part) Inheritance None of the given
7. When a class contains objects of another class, the relationship is called a whole-part relationship or composition. The relationship created is also called a has-a relationship. Discuss some of the possible issues with composition, such as the long statement: Outputsales.getHighestPaidEmployee().getHireDate().getYear().
Question 30 Which of the following description is TRUE? Inheritance allows us to define a class based on another class. Child classes receive all the features from the parent class but can NOT have their own additional features. Abstraction means that a method in a parent class can have a number of different implementations in child classes. An interface is a completely abstract class, which contains abstract properties, methods, and variables. The private access modifier makes members accessible only from within the class and hides them from the outside.
You will define three objects class Person, BookAuthor, and Book. Class Person involves a person's identity. Class BookAuthor involves a collection of books or book titles. Class Book involves the number of books in stock , book title and price. Design the three classes: The classes must use an appropriate inheritance relationship. Each class must have a constructor. Each class has at least two private data members and you must include accessors. You must test your classes by creating a BookAuthor object and printing the Person, Book and BookAuthor values from a function you create inside of BookAuthor. Make sure you use the book object correctly and put it inside of BookAuthor. in pytgi
1. A method stub is a) a short method b)a method with an abrupt end c)a method whose header has not yet been written d) a method whose statements have not yet been written 2 An abstract class can always be instantiated as an object can sometimes be instantiated as an object can often be instantiated as an object can never be instantiated as an object 3)When a derived class defines a member method that has the same name, parameters, and return type as a base class's method, the member method is said to overload the base class's method overreach the base class's method override the base class's method overshadow the base class's method 4. What would be the best code to print out all the elements of an array for (int i = 0 ; i <= arry.length ; i++ ) System.out.println(arry[i]); for (int i = 0 ; i < arry.length ; i++ ) System.out.println(arry[i]); for (int i…
Polymorphism : Write a driver program that uses a AECar reference variable to point to three different types of classes, showing that inheritance is one mechanism for using polymorphism.