Premise: Class B is a subclass of Class A. Class C is a subclass of Class B. Is the following code valid? B b = new B(); C c = new C(); A a = b; b = c; Valid Invalid
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OOPs
In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.
Constructor
The easiest way to think of a constructor in object-oriented programming (OOP) languages is:
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- Premise: Class B is a subclass of Class A Is the following code valid? B obj = new A(); Valid InvalidProgramming 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…class A{ void methodA(){} void methodB(); } class B extends A{ void methodA(){ } } class A should be abstract methodB should be abstract both a and b both classes are okay
- Given: interface B void methodA(); class C implements B { void methodB(){ } } everything is fine methodA should be overriden in class C O class C should be abstract O either b or cDetermine if this statement is true or false Take the following method, which is defined in some class: class SomeClass: SomeBaseClass{ private int override MyMethod() { //do something.... } } This is an example of run time polymorphism, as MyMethod is being redefined in the child class by the override keyword.A class is made abstract by declaring that class virtual. T/F
- 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…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 hierarchyAssignment: Write the class XXXX_Worker with constructors, accessors, mutuators, and a toString method. A Worker has a Worker Name and Number. Write the class XXXX_ProductionWorker which is a subclass of Worker. The production worker has a shift number (values: 1 or 2) and an Hourly pay rate. A shift number of 1 means the day shift and 2 means the night shift. Write the class XXXX_ShiftSupervisor which is a subclass of Worker. The shift supervisor is a salaried worker who supervises a shift. The shift supervisor has a yearly bonus field. The yearly bonus is earned at year end based on performance. Write a class, XXXX_TestWorker, which does the following: Creates one Shift Supervisor object from information entered by the user. Creates an Array of Production Workers that can hold 3 objects. Itcreates3ProductionWorkerobjectsfrominformationenteredbytheuser Prints the information about each object in the format shown below using the toString methods of the…
- True or False, An abstract class must have at least one abstract method.True or false?(a) You can override a nonprivate method defined in a superclass.(b) You can override a private method defined in a superclass.(c) You can override the initializer defined in a superclass. (d) When constructing an object from a subclass, its superclass’s initializer is automatically invoked.77255 Polymorphism - abstract class BankingAccount class. Create an application with an abstract class called Account with an abstract method calculateInterest, derive the following three classes from Account class 1. SBAccount 2. DAccount 3. FDAccount Implement the abstract method in these classes; Invoke these methods from the main method using the reference of BankingAccount class