1. Which SOLID principle would apply for the following statements? Justify your answerbriefly.Instead of changing the code of the class directly, we can create a subclass andoverride parts of the original class that we want to behave differently.ii. Parameter types in a method of a subclass should match or be more abstract thanparameter types in the method of the superclass.iii. Make every class responsible for a single part of the functionality provided by thesoftware, and make that responsibility entirely encapsulated by the class.iv.i.We can extend low-level classes to use with different business logic classes withoutbreaking existing classes and therefore, high-level classes shouldn't depend on low-level classes.Classes that are able to implement the original interface can just implement severalrefined interfaces. Other classes can implement only those interfaces which haveV.methods that make sense for them.

The question is on: which SOLID principle would apply for the following statements.

Answered: 1. Which SOLID principle would apply…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Let's say you have a method that expects the object of the superclass to be sent in as an argument. If, rather of offering it a superclass object, you provide it an instance of a subclass in this circumstance. Is it appropriate? What leads you to believe that is the case?
How can we ensure a method is not overridden by a subclass? a. Making a method private will make it so the subclass cannot see the method, and it will not be able to override it and change its functionality. b. The protected keyword will protect the method from being overridden. c. The purpose of inheritance is to allow a sub-class to change any implementation of the parent class, so we cannot stop a method from being overridden. d. If the method does not appear in the interface we implement, the sub-class will not override it.
1. Given the following new class declaration, who is the subclass and who is the superclass? public class Computer extends Equipment {…} 2. In a subclass’s constructor, how do we call a specific constructor in superclass? 3. What is the difference between method overriding and method overloading?
Assume you have a method that needs an object of the superclass as an argument. In this situation, you should provide it with a subclass object rather than a superclass object. Is it appropriate? Why do you believe that?
What is polymorphism in Java? It is when a program uses several different types of objects, each with its own variable. It is when a single variable is used with several different types of related objects at different places in a program. It is when a single parent class has many child classes. It is when a class has several methods with the same name but different parameter types.
If the programmer doesn't declare any constructors for an extended class, what constructors will be inherited from the superclass? How does this inherited constructor initialize new instance variables that are not part of the superclass? Suppose that Vehicle is a class and Car is a new class that extends Vehicle. Write a description of which kind of assignments are permitted between Car and Vehicle variables. Suppose you write a new constructor for an extended class. Describe two different ways that the superclass's instance variables could be initialized within the constructor for the extended class.
Let's pretend you have a method that expects its superclass's object as an argument. In this case, providing a subclass object rather than a superclass object will be preferable. Is it the right time? Explain why you believe that is the case.
Draw and explain the chart for implementing accessibility control using package in Java. Write program for the following. 1. Create an abstract parent class Parent, with Abstract method show, Abstract method display, Concrete method callme 2. Create two concert sub classes Child1 and Child2 which inherits the Parent class. 3. Declare a reference variable of the parent class and create one object for each child class. 4. Assign the reference of the object of child class to the reference variable of the parent class and implement dynamic method dispatch for all the possible methods in each child class.
Why is the ability to redefine a method important in object-oriented programming?Choose all options that apply.(a) Because it allows us to add extra work to a method.(b) Because it allows us to introduce abstract methods that are redefined as concrete methods.(c) Because it allows us to provide a more accurate or faster definition in a subclass.(d) Because it allows us to disable a method in a subclass.(e) Because it allows us to change the meaning of a method.
Read a UML diagram to determine the new methods and or instance variables. Define instance variables, accessors, and mutators. Define a constructor to initialize those variables. Define constructors for your subclasses and call the superclass constructor. Override superclass methods, by combining and extending their behavior. Override the toString method in a subclass. There is no printing and you will not need Scanners, or do any input. Inheritance Write the Bicyle class which extends Vehicle. The UML diagram is shown below. Follow it exactly. The Bicycle constructor call the superclass constructor to initialize owner and wheels getGearRatio() returns the product of gears and wheels. (Stupid, I know.) Override the toString() method and return the information in this form, all on one line:Bicycle(model="Trek T700", gears=21) extends Vehicle(owner="V. Nibali", wheels=2)
You need to perform following things to demonstrate the concept of abstract class. Step 1: Create the abstract class that has following methods. • Calculate the area of circle(Abstract method) • Calculate the area of triangle(Abstract method) • Calculate the area of rectangle(Method with implementation) Step 2: Create another class that extends above class and provide implementation of abstract methods. Step 3: Create the main method inside above class and display output of area of circle, area of triangle and area of rectangle. You need to submit the following things: • Java program with both the classes An output screenshot created using Microsoft Word
Please give clear explanations and code examples for each question.What is a class loader? Class vs. Object?What is a constructor?

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