What is true about private fields of a class? They must be used with private methods. They are accessible from anywhere inside or outside of a class. They can never be used in a class. They can be accessed only by methods inside the class they are associated with. Which of these keywords is used to refer to a member of a base class from a subclass? power super this upper Which of the following is true about abstract classes? Note that if a class can be sub-classed, this simply means that it can be derived from. Abstract classes can only contain abstract methods. They cannot be sub-classed. Abstract classes cannot be instantiated, but they can be sub-classed. Abstract classes can only contain abstract methods. They can be sub-classed. Abstract classes can be instantiated, but they cannot be sub-classed.

What is true about private fields of a class? They must be used with private methods. They are accessible from anywhere inside or outside of a class. They can never be used in a class. They can be accessed only by methods inside the class they are associated with. Which of these keywords is used to refer to a member of a base class from a subclass? power super this upper Which of the following is true about abstract classes? Note that if a class can be sub-classed, this simply means that it can be derived from. Abstract classes can only contain abstract methods. They cannot be sub-classed. Abstract classes cannot be instantiated, but they can be sub-classed. Abstract classes can only contain abstract methods. They can be sub-classed. Abstract classes can be instantiated, but they cannot be sub-classed.

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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Similar questions

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?
If a member is declared private in a class, can it be accessed from other classes? If a member is declared protected in a class, can it be accessed from other classes? If a member is declared public in a class, can it be accessed from other classes?
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
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.
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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What is the difference between equals() and == ? == looks to see if they are identical objects whereas equals() matches the content of the objects. equals() looks to see if they are identical objects whereas == matches the content of the objects. equals() and | == are used to match the content of objects, so no difference. equals() is used to match string objects whereas == is used to match all objects. O O O O
Which of the following is true about abstract classes? Note that if a class can be sub-classed, this simply means that it can be derived from. Abstract classes can only contain abstract methods. They cannot be sub-classed. Abstract classes cannot be instantiated, but they can be sub-classed. Abstract classes can only contain abstract methods. They can be sub-classed. Abstract classes can be instantiated, but they cannot be sub-classed. Can an interface ever contain method bodies (i.e. content between {})? Unknown Yes No Sometimes
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
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