ClassA + retrace(): void 1 <> Retraceable + retrace(): void 1 ClassB + retrace(): void
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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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- Task: Implement a class ChessPiece with properties: color, isAlive, moveCount, and position (x, y coordinates). Define an abstract move method. Create a Tower subclass that overrides move for specific behavior. Instructions: ChessPiece Class: Properties: String color, boolean isAlive, int moveCount, Position position. Abstract Method: move(int x, int y). Position Class: Contains int x, int y. Tower Subclass: Extends ChessPiece. Overrides move for straight line movement. Deliverable: Source code for ChessPiece, Position, and Tower. Document class functionalities briefly.Create an interface Wheel with methods setWheels (int c) and getWheels () and a class Vehicle with abstract methods getColor () and getBrand (). Now, create a concrete class Taxi with additional method setDriver (String name) that inherits both Wheel and Vehicle. (Note: Concrete classes don’t have any abstract method)Implement a JAVA application that keeps track of package deliveries to consumers. Theapplication consists of the following classes:• Item: Create a class called Item. The class has two member variables oftype String named name and description and provides getter and settermethods for both.• Mail (abstract class): Implement an abstract class called Mail . The class hasa member variable of type String named address and a getter method for it.• Letter: Implement a class called Letter that inherits from Mail . The classhas one member variable of type String named contents.• Package: Implement a class called Package that inherits from Mail . Theclass has one member variable of type Item[] named items and a gettermethod for it.• DeliveryTruck: Implement a class called DeliveryTruck with a singlemember variable of type Mail[] of length 10. Add the following method:o void load(Mail mail): This method stores the given mail argumentat the next available spot in the member variable.
- Consider the following UML diagram. Suppose that each of these classes has a getMass () method that returns the mass of the current object (double); that the Star class has a getPlanets () method that returns an array of Planet objects (the planets that orbit this planet); and that the Planet class has a getMoons () method that returns an array of Moon objects (the moons if this planet). All attributes of these classes are private. All methods described above are public. Star 0.. Planet Create a class called SolarMass that has a single class method in it called solarMass (Star theStar) that returns the total mass of the input star (along with the mass of all of that star's planets and their moons). The method returns a double. Any program should be able to call this method. e..* Moonsolve this by arraylist in the last of the question it has been told Create abstract class Pet , which is the abstract superclass of all animals. Declare a integer attribute called legs, which records the number of legs for this animal. Define a constructor that initializes the legs attribute. Declare an abstract method eat. Declare a concrete method walk that prints out something about how the animals walks (include the number of legs). Create the Dog class. The Dog class extends the Pet class. This class must include a String attribute to store the name and food of the pet Define a default constructor that calls the superclass constructor to specify that all dogs have 4 legs and name. override the eat and walk method. Create the Cat class that extends Pet. This class must include a String attribute to store the name of the pet, and a string to save food . Define a constructor that takes one String parameter that specifies the cat's name and food. This constructor must also…Instructions: Write your answer on a piece of paper with your name on top. Take a picture and submit within the allocated time limit. Problem 1: Implement class Employee as illustrated below. Apply appropriate constructors, encapsulate, and override toString and equals. Student Course Problem 2: «interface Payable abstract Employee Person SalariedEmployee Idno Name Employee Superclass Department Salary Subclass getPayment Amount() firstName, lastName, SSN weeklysalary Given the class hierarchy: 1. Define the interface Payable. 2. Define the class Employee that implements Payable and encapsulate. 3. Define SalariedEmployee and encapsulate. Implement getPayment Amount(). getPayment Amount() - returns a double amount that must be paid for an object of any class that implements the interface. For SalariedEmployee, it would just return the value returned by getWeeklySalary(). for new files: 128MB
- a:) Define a Polygon interface that has methods area() and perimeter(). b:) Then implement classes for Triangle, Quadrilateral, Pentagon, Hexagon, and Octagon, which implement this interface, with the obvious meanings for the area() and perimeter() methods. c:) Implement classes, IsoscelesTriangle, Equilateral-Triangle, Rectangle, and Square, which have the appropriate inheritance relationships. d:) Write a simple user interface, which allows users to create polygons of the various types, input their geometric dimensions, and then output their area and perimeter. e:) For extra effort, allow users to input polygons by specifying their vertex coordinates and be able to test if two such polygons are similar. using all a to e parts develop a program-Interface IResearch Scholar has two methods public void teaches (String str) and public void studies (String str). - Define classes JuniorRS and SeniorRs such that JuniorRS implements IResearchScholar and SeniorRS extends JuniorRS. - Class InterAbstrTest extends SeniorRS, and has the main method. An object of JuniorRs invokes the method studies, and an object of SeniorRS invokes methods studies and teaches.Abstract classes and interfaces can both be used to specify common behavior of objects.How do you decide whether to use an interface or an abstract class? Explain youranswer.
- import bridges.base.ColorGrid;import bridges.base.Color;public abstract class Mark {// this is protected (rather than private) so that// subclasses of Mark can access itprotected Color color;/*Returns true if and only if the given Coloris the same as this Mark's Color. Two Colorsare considered the same if their Red, Green,Blue, and Alpha components are equal.c: the Color to check against*/public boolean isColor(Color c) {return false;}/*Draws this Mark onto the given ColorGridcg: the ColorGrid to draw onto*/public abstract void draw(ColorGrid cg);} import bridges.base.Color;import org.junit.Assert;import org.junit.Test;public class MarkTest {private static final Color B = new Color("black");private static final Color W = new Color("white");private static final Color U = new Color("blue");@Testpublic void isColorTest() {Mark m1 = new Point(0, 0, W);Mark m2 = new HorizontalLine(1, 1, 2,…Explain the difference between the following implementations of class A.a. extending class A from class Bb. extending class A from parent abstract class Cc. class A implementing interface DPurposeTo review abstract classes and polymorphismDirectionsThe total cost of a group of items at a grocery store is based on the sum of the individual product prices and the tax (which is 5.75%). Products that are considered “necessities” are not taxed, whereas products that are considered “luxuries” are. For this practice problem you will need to download Shopping Trip Starting Code.zip from Pilot.The Product class is abstract, and it has a method called getTotalPrice. Your task is to create two subclasses of Product: NecessaryProduct and LuxuryProduct and implement the getTotalPrice method in each of these classes appropriately. Then modify the driver program to instantiate four…
