4. Given, an abstract class as the following: abstract class Test{ abstract void add(); } Which one of the following statement is valid? a. Test to =new Test() b. new Test(); c. Test [Jarray=new Test[5]; d. Test to =new Test(10);
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- class first { public: void setX(); void print() const; protected: int y; void setY(int a); private: int x; }; Suppose that class second is derived from class first using the statement: class second: private first which members of class first are private, protected, and public in class second?Activity - Abstract Class An English teacher wants to find assessment mark of all the students in his course. Write a java program to find assessment mark of the students using following instructions. Save the project/file as StudentAbstract. A) Abstract Class name: Assessment Abstract Member Method: - to calculate and return total score totalScore() B) Class name: English extends Assessment Member variables: QuizMark, PracticeTest, ListeningMark Member Method : - Constructor to initialize member variables - to calculate and return total score totalScore QuizMark + PracticeTest*0.25 + %3D ListeningMark/2 C) Controlling class : StudentAbstract - To create an object of English class - To print totalScore of the EnglishWhich of the following codes is/are valid?Code 1:abstract class X{abstract void func1();abstract void func2() {}}Code 2:abstract class X{abstract void func1();void func2() {}}
- PROGRAMMING LANGUAGE: C++ Write a program that has a base class named FlightCrew. This class shouldhave three data members: an integer to store the ID of the crew member, aninteger to store the number of years of service and another integer to storethe total salary of the member. Provide a parameterized constructor in theclass to set the values of the data members.Derive a class Pilot from FlightCrew to contain two additional data members,an integer to store the number of hours of flight and a boolean to storewhether the Pilot has military experience or not. Provide a paramete rizedconstructor in the Pilot class. Provide a function bonus() in the class wherethe bonus of a pilot is his number of flight hours times the 10% of his salary.Likewise, provide a function isEligible() in the class to find out if the pilot iseligible for promotion or not. A pilot is eligible for promotion to the nextrank if he has at least 5 years of experience and the number of total flighthours is greater…True or False, An abstract class must have at least one abstract method.Analysis the following class definition and answer the following question. class Student{ private int id, age; protected float mark; int getAge (int a){ return a ; } protected void setMark (float m){ mark = m; } float result(){ return mark / 2; } } What is the access specifier of the result in the above code? a. No access specifier b. private c. float d. public e. void
- Consider the following class declaration: class Thing {private: int x; int y;static int z; public:Thing(){ x = y = z; }static void putThing(int a) { z = a; }};int Thing:: z = 0:Assume a program containing the class declaration defines three Thing objects with the following statement:Thing one, two, three;A) How many separate instances of the x member exist?B) How many separate instances of the y member exist?C) How many separate instances of the z member exist?D) What value will be stored in the x and y members of each object?E) Write a statement that will call the putThing member function before the Thing objects are defined.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 hierarchyclass GradedActivity { private: double score; public: GradedActivity() { score = 0.0; } GradedActivity(double s) { score = s; } void setScore(double s) { score = s; } double getScore() { return score; } char getLetterGrade() const; }; Implement the GradedActivity class above. In this C++ assignment, create a new class Assignment which is derived from GradedActivity. It should have three private member ints for 3 different parts of an assignment score: functionality (max 50 points), efficiency (max 25 points), and style (max 25 points). Create member function set() in Assignment which takes three parameter ints and sets the member variables. It should also set its score member, which is inherited from GradedActivity, using the setScore() function, to functionality + efficiency + style. Signature: void Assignment::set(int, int, int) Create a main program which instantiates an Assignment, asks the user…
- class first { public: void setX(); void print() const; protected: int y; void setY(int a); private: int x; }; Suppose that class second is derived from class first using the statement: class second: private first Determine which members of class first are private, protected, and public in class second.Programming Language = Python 1. Employee and ProductionWorker Classes Write an Employee class that keeps data attributes for the following pieces of information: • Employee name • Employee number Next, write a class named ProductionWorker that is a subclass of the Employee class. The ProductionWorker class should keep data attributes for the following information: • Shift number (an integer, such as 1, 2, or 3) • Hourly pay rate The workday is divided into two shifts: day and night. The shift attribute will hold an integer value representing the shift that the employee works. The day shift is shift 1 and the night shift is shift 2. Write the appropriate accessor and mutator methods for each class. Once you have written the classes, write a program that creates an object of the ProductionWorker class and prompts the user to enter data for each of the object’s data attributes. Store the data in the object and then use the object’s accessor methods to retrieve it and display it on the…18. If a class is declared as final, the incorrect statement is (). A. Indicates that this class is final B. Indicates that this class is a root class C. Methods in this class cannot be overridden D. Variables in this class cannot be hidden 19. In the following description of polymorphism, the incorrect one is (). A. Polymorphism refers to "one definition, multiple implementations" B. There are three types of polymorphism: dynamic polymorphism, static polymorphism, and default polymorphism C. Polymorphism is not used to speed up code D. Polymorphism is one of the core characteristics of OOP 20. In Java, two interfaces B and C have been defined. To define a class that implements these two interfaces, the correct statement is ( ). A. interface A extends B,C B. interface A implements B,C C. class A implements B,C D. class A extends B,C 21. Given the following java code, the correct description of the usage of "super" is (). class Student extends Person{ public Student() { super(); } 3 D…