An cannot be instantiated, they act as place holders for abstraction. O a. Abstract class O b. Subclass O C. Superclass O d. Parent class
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- ?4. Which of these is not a correct statement about abstract class? a. Every class containing abstract method must be declared abstract. b. Abstract class define only the structure of the class not its implementation c. Abstract class can be initiated by new operator d. Abstract class can be inheritedA is the parent class, whereas B and C are subclasses. In some ways, B and C are quite similar yet their implementations of certain of their functions are substantially different. Explanation of A: a concrete class, an abstract type or interface using logical reasoning
- 5. Is it compulsory for a class, which has been declared as abstract, to have at least one abstract method?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.A subclass of an abstract class must be able to do all of the things the parent class can do. True or not?
- The parent class is A, and the subclasses are B and C. The parent class is A, and the subclasses are B and C. B and C have several features and methods in common, but their implementations of some of these features and techniques are drastically different from one another. Explain what A will be in terms of logic: willit be a concrete class, an abstract class, or an interface?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.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 2 In object oriented programming, inheritance improves code readability and maintenance by allowing new classes to re-use existing classes. Use inheritance to solve the following problem: A: A Car is a Vehicle and has a name, a max_speed value and a number_of_cylinders attribute that specifies the number of cylinders in the car's engine. - Add accessor and mutator methods to get and set the values of the class attributes. - Attributes of the car objects are initialized at the time when the object is created. - When a car object is printed, its name, max_speed and number_of_cylinders are shown. B: An Airplane is also a Vehicle and has a name, a max_speed value and a number_of engines attribute that specifies the number of jet engines the airplane has. - Add accessor and mutator methods to get and set the values of the class attributes. - Attributes of the airplane objects are initialized at the time when the object is created. - When an airplane object is printed, its name,…Class A is the parent class, while classes B and C are the subclasses of A. Both B and C contain several features and techniques that are equivalent to one another; nevertheless, the implementations of some of their methods are quite different between the two. Explain what kind of class A will be using logic, whether it be a concrete class, an abstract class, or an interface.An abstract class a. Cannot be used to declare pointers and references b. Has at least one pure virtual function c. Can be instantiated d. Cannot have any constructors