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.

Dear Student, The answer to both your questions is given below -

h (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

h (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

Microsoft Visual C#

7th Edition

ISBN:9781337102100

Author:Joyce, Farrell.

Publisher:Joyce, Farrell.

Chapter10: Introduction To Inheritance

Section: Chapter Questions

Problem 20RQ

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What is the design pattern depicted in the diagram below? The intent of this design pattern is to define an interface for creating an object, but let subclasses decide which class to instantiate. It lets a class defer instantiation to subclasses. Client Abstraction normalMethodoe BmakeObjecto Product do some stuff aProduct = makeObjecto: f do some more stuff -aProduct Product ConcreteOne ConcreteTwo makeObjecto : Product ProductOne ProductTwo return new ProductOneo. A. Factory Method Design Pattern B. Singleton Design Pattern C. Proxy Design Pattern D. Adapter Design Pattern
A class type cast can be used to force an object reference to be converted into another object reference of a class type which is not the original type, or a subclass, of the object reference being type-casted. * True False
Which of these statements IS NOT true regarding design by contract. Question options: Creating and implementing an interface is an example of implicit design by contract. Explicit design by contract makes specifications part of the compiled code for a program. Creating and building from an abstract class is an example of explicit design by contract. When we code to an interface, we create a set of methods to be used to interact with a class; these methods establish a contract for how the design should work. Option B is not the correct answer.
Make 3 choices. Which of the following are incorrect? Select 3 correct answer(s) An abstract class contains constructors. The constructors in an abstract class should be protected. The constructors in an abstract class are private. You may declare a final abstract class. An interface may contain constructors.
Both interfaces and abstract classes can be used to specify common behavior for objects. Explain how you decide whether to use an interface or an abstract class.
Abstract classes and interfaces may be used interchangeably to specify the behavior of objects.How do you know whether you need an interface or an abstract 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.
Which of the following statements are true. a) An abstract method contains a signature but no code implementation. b) We cannot create an instance of an abstract class by using the new operator. c) We can derive classes from an abstract class, but we must provide code to implement all of the abstract methods. d) All of the above statements are true.
B and C are its subclasses, and A is the parent class. Now, B and C have certain similar features and methods, but B and C implement a number of their methods very differently. Use logic to specify if A is a concrete class, an abstract class, or an interface.
The interface Speaker is describe below. public interface Speaker{ public void speak(); public void announce(String str); } Create classes Dog and Philosopher implementing the Speaker interface. (The code for the general overview of the classes are provided you just need to fill the method and class headers and their code) and then create a driver class showing the abilities of interface, these tests are includes the ability of creating an object of Dog and Philosopher with interface reference, testing their polymorphic ability with invoking the methods of interface. and showing how we can use a method of child class of interface (Pontificate for the case of philosopher) using casting. i will include the templates below which you will use to answer the question. you will just need to input the missing codes in the required spaces. //******************************************************************** // SpeakerTest.java Author: Lewis/Loftus // // Solution to Programming Project 10.3…
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
QUESTION 5 All methods in an abstract class must also be declared abstract. True False QUESTION 6 All fields declared in an interface are treated as final and static have protected access must be initialized in the class implementing the interface have private access

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		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.



		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.