20:38Back adjava300 18-Nov-2022 11-46-...12. Can an object be a subclass of another object?A. Yes as long as single inheritance is followed.B. No inheritance is only between classes.C. Only when one has been defined in terms of the other.D. Yes when one object is used in the constructor of another.13. What is an abstract class?A. An abstract class is one without any child classes.B. An abstract class is any parent class with more than one child class.C.An abstract class is class which cannot be instantiated.D.abstract class is another name for "base class."14. Can an abstract class define both abstract methods and non-abstract methods?A.No it must have all one or the other.B.No it must have all abstract methods.C.Yes but the child classes do not inherit the abstract methods.D.Yes the child classes inherit both.15. Can an abstract method be defined in a non-abstract class?A. No-if a class defines an abstract method the class itself must be abstract.B. No only classes are abstract, not methods.C.Yes-a method can be declared abstract in any parent as long as the child classesalso declare it abstract.Yes there is no restriction on where abstract methods can be defined.D.16. What is polymorphism in Java?A.It is when a single variable is used with several different types of related objects atdifferent places in a program.B. It is when a program uses several different types of objects, each with its ownvariable.C.It is when a single parent class has many child classes.D.It is when a class has several methods with the same name but different parametertypes.17. Given the method declaration below,public void m1 (int num1, int num2) {}which method declaration override method m1 when written in a subclass?A. public void m2 (int numl, int num2) ()B. public void m1 (int num1, double num2) ()C. public string ml (int num1, int num2, int num3) ()D. public int ml (int numl, int num2) ()LTE18. When a class implements an interface, what must it do?A. It must redefine each constant from the interface.B. It must declare and provide a method body for each method in the interface.C. It must declare a variable for each constant in the interface.D. It must include a private method for each method in the interface.19. What is the base class of nearly all Swing classes?a

12. Can an object be a subclass of another object? Inheritance occurs only between the classes and…

12. Can an object be a subclass of another object? A. Yes-as long as single inheritance is followed. B. No inheritance is only between classes. C. Only when one has been defined in terms of the other. D. Yes when one object is used in the constructor of another. 13. What is an abstract class? A. An abstract class is one without any child classes. B. An abstract class is any parent class with more than one child class. C. An abstract class is class which cannot be instantiated. D. abstract class is another name for "base class." 14. Can an abstract class define both abstract methods and non-abstract methods? A. No it must have all one or the other. B. No-it must have all abstract methods. C. Yes but the child classes do not inherit the abstract methods. D. Yes the child classes inherit both.

12. Can an object be a subclass of another object? A. Yes-as long as single inheritance is followed. B. No inheritance is only between classes. C. Only when one has been defined in terms of the other. D. Yes when one object is used in the constructor of another. 13. What is an abstract class? A. An abstract class is one without any child classes. B. An abstract class is any parent class with more than one child class. C. An abstract class is class which cannot be instantiated. D. abstract class is another name for "base class." 14. Can an abstract class define both abstract methods and non-abstract methods? A. No it must have all one or the other. B. No-it must have all abstract methods. C. Yes but the child classes do not inherit the abstract methods. D. Yes the child classes inherit both.

C++ Programming: From Problem Analysis to Program Design

8th Edition

ISBN:9781337102087

Author:D. S. Malik

Publisher:D. S. Malik

Chapter11: Inheritance And Composition

Section: Chapter Questions

Problem 25SA

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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.
Draw and explain the chart for implementing accessibility control using package in Java. Write program for the following. 1. Create an abstract parent class Parent, with Abstract method show, Abstract method display, Concrete method callme 2. Create two concert sub classes Child1 and Child2 which inherits the Parent class. 3. Declare a reference variable of the parent class and create one object for each child class. 4. Assign the reference of the object of child class to the reference variable of the parent class and implement dynamic method dispatch for all the possible methods in each child class.
5.The design for class and inheritance 1. Inheritance progrmming (1).Create class Point, with two private instance variables x and y that representd for the coodinates of a point. Provide constructor for initializing two instance variables. Provide set and get methods for each instance variable, Provide toString method to return formatted string for a point coodinates. (2). Create class Circle,it inheritance from Point. Provide a integer private redius instance variable. Provide constructor to initialize the center coodinates and redius for a circle,.In the constructor it must calls its supperclass constructor by using super(x,y); Provide set and get for redius instance variable. Provide two methods for calculating its area and perimeter. Provide toString method to return a formatted string for a circle features.In the method, it must calls its supperclass toString method by using super.toString(). (3)Similar to the above class Circle definitionto,Design Rectangle…
4. Abstract classes and interfaces can both be used to specify common behavior of objects. How do you decide whether to use an interface or an abstract class? Explain your answer.
D. Introducing Class Diagram • Specifications of a class can be also expressed using a class diagram. • Class diagram is a standard way to represent a class. • The above-mentioned Icecream class can be represented using the following diagram. TE TE TE Icecream icecreamType: String -icecreamCompany: String -icecreamPrice: double +Icecream) +lcecream(icecreamType: String, icecreamCompany: String, icecreamPrice: double)E +toString(): String +equals(: Icecream): boolean +compare To(l: Icecream): int TE TE UNREGISTERED UNREGISTERED UNREGISTE Based on the 'Icecream' class as defined before, now create an array of Icecream type objects and get the input from the user to initialize those objects. The size of array must be at least 5. Now, write a static method searchByCompany in the Main class of the previous implementation, which takes a String parameter representing company name and then prints all icecream's information manufactured by that company.
Answer by true or false 1.An abstract class can contain only abstract methods . 2. An abstract class that extends another abstract class must provide an implementation for all the abstract methods that are defined in the superclass . 3. A parent's constructor can be invoked using the super reference . 4. All Java classes are derived , directly or indirectly , from the Object class . 5. The child of one class can be the parent of one or more other classes .
Consider five classes i.e. Professor, Researcher, Department, Laboratory, and University having following specifications. Class University has Two attributes of type string i.e. universityName and location An attribute named dept of type Department Class Department has Two attributes i.e. deptID, deptName A two-argument constructor to initialize data fields with user-defined values A member function display() to show all attribute values Class Laboratory contains Two attributes i.e. labID and experimentNo A two-argument constructor to initialize data member with user-defined values Class Professor has A data field named profName of type string A data field named dept of type Department A two-argument constructor to initialize both attributes of user-defined values Class Researcher has A data field named profName of type string A data field named dept of type Department An attribute named lab of type Laboratory A constructor to initialize lab with user-defined…
Java, Object-Oriented Programming, UML Create a simple POS program that applies the concepts of OOP (Inheritance, Polymorphism, Abstraction, and Encapsulation), with the following conditions: • Create a Main class, 1 superclass, and at least 2 sub-classes • Simulate a purchase of a customer. Provide code & output screenshots, and a UML Diagram.
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): void
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.
State a circumstance in which you would prefer an interface over an abstract class. Also, State a circumstance in which you would prefer an abstract class over an interface.
What is abstraction and what is the advantage of using an abstract class?