Question

Exercise #3 - Geometrical Shapes Authored by Blanche Pinto, [email protected] Design a class named Shape and its two subclasses named TwoDimensionalShape and Three DimensionalShape. Make Circle and Square subclasses of Two DimensionalShape. Make Sphere and Cube subclasses of Three DimensionalShape. Shape class The following requirements specify what fields you are expected to implement in your Shape class; - A private String color that specifies the color of the shape - A private boolean filled that specifies whether the shape is filled A private date (java.util.date) field dateCreated that specifies the date the shape was created Your Shape class will provide the following constructors; • A constructor that creates a shape with specified color and filled value Your Shape class will also provide the following methods: . Mutator and accessor methods for all data fields (no mutator for dateCreated) . A method named toString that returns a string representation of this object "created on: .. color: filled: ... TwoDimensionalShape class The following requirements specify what fields you are expected to implement in your Two DimensionalShape class; - A private double dimension that specifies the first dimension of the shape - A private double dimension that specifies the second dimension of the shape Your TwoDimensionalShape class will provide the following constructors; - A constructor with four arguments that creates a 2D-shape Your TwoDimensionalShape class will also provide the following methods; - Mutator and accessor methods for all data fields • A method named toString that returns a string representation of this object "created on: ... color: ... filled: shape type: 2-D dimensioni: .. dimension2:

Language is JAVA.

Clarification for the Shape class (highlighted):

The following requirements specify what fields you are expected to implement in your Shape class;

- A private String color that specifies the color of the shape

- A private boolean filled that specifies whether the shape is filled

- A private date (java.util.date) field dateCreated that specifies the date the shape was created Your Shape class will provide the following constructors;

- A two-arg constructor that creates a shape with specified color and filled value.

Your Shape class will also provide the following methods;

- Mutator and accessor methods for all data fields (no mutator for dateCreated)

- A method named toString that returns a string representation of this object “created on: … color: ... filled: ...”

Answer 1

import java.util.Scanner; abstract class Shape { private String color = "white"; private boolean filled; protected java.util.Date dateCreated; public Shape() { dateCreated = new java.util.Date(); } public Shape(String color, boolean filled) { dateCreated = new java.util.Date(); this.color = color; this.filled = filled; } /** Return color */ public String getColor() { return color; } /** Set a new color */ public void setColor(String color) { this.color = color; } /** Return filled. Since filled is boolean, its getter method is named isFilled */ public boolean isFilled() { return filled; } /** Set a new filled */ public void setFilled(boolean filled) { this.filled = filled; } /** Get dateCreated */ public java.util.Date getDateCreated() { return dateCreated; } public String toString() { return "\nCreated on "+getDateCreated()+"\ncolor: " + color + "\nfilled: " + filled ; } } abstract class TwoDShape extends Shape { public TwoDShape(String color, boolean filled) {    super(color,filled); } public abstract double getArea(); } class Circle extends TwoDShape { private double radius; public Circle(String color, boolean filled,double radius) {    super(color,filled); this.radius = radius; } public double getRadius() { return radius; } public double getArea() { return 3.14*radius*radius; } public double getPerimeter() { return 2*3.14*radius; } public String toString() { return super.toString() +"\nShape Type : 2D Circle "+"\nRadius : "+radius; } } class Square extends TwoDShape { private double side; public Square(String color, boolean filled,double side) {    super(color,filled); this.side = side; } public double getArea() { return side*side; } public double getPerimeter() { return 4*side; } public String toString() { return super.toString() +"\nShape Type : 2D Square"+"\nSide : "+side; } } abstract class ThreeDShape extends Shape { public ThreeDShape(String color, boolean filled) {    super(color,filled); } public abstract double getArea(); public abstract double getVolume(); }; class Sphere extends ThreeDShape { private double radius; public Sphere(String color, boolean filled,double radius) {    super(color,filled); this.radius = radius; } public double getArea() { return 4*3.14*radius*radius; } public double getVolume() { return 4*3.14*radius*radius*radius/3; } public String toString() { return super.toString() +"\nShape Type : 3D"+"\nRadius : "+radius; } } class Cube extends ThreeDShape {    private double depth;    public Cube(String color, boolean filled,double depth)// constructor { super(color,filled); this.depth = depth; } public double getDepth() { return depth; }       public double getArea() //compute the area of the cube { double area; area = 6*getDepth()*getDepth(); return area; } public double getVolume() //compute the volume of the cube { double vol; vol = getDepth() * getDepth() * getDepth(); return vol; } public String toString() { return super.toString() +"\nShape Type : 3D Cube"+"\ndepth : "+depth; } }       class TestShapes { public static void main (String[] args) { Scanner input = new Scanner(System.in); int option1; System.out.println("Enter "); System.out.println("1. Two Dimensional Shape "); System.out.println("2. Three Dimensional Shape ");    int option = input.nextInt();    switch(option) { case 1: System.out.println("Enter "); System.out.println("1. Circle "); System.out.println("2. Square ");    option1 = input.nextInt();    switch(option1) { case 1: System.out.println("Enter radius of circle : "); double radius = input.nextDouble(); Circle c = new Circle("Red",true,radius); System.out.println(c); System.out.printf("\nArea of circle : %.2f",c.getArea()); System.out.printf("\nPerimeter of circle : %.2f",c.getPerimeter()); break;    case 2: System.out.println("Enter side of square : "); double side = input.nextDouble(); Square s = new Square("Yellow",false,side); System.out.println(s); System.out.printf("\nArea of square : %.2f",s.getArea()); System.out.printf("\nPerimeter of square : %.2f",s.getPerimeter()); break;    default: System.out.println("Invalid option"); break; } break; case 2: System.out.println("Enter "); System.out.println("1. Sphere "); System.out.println("2. Cube ");    option1 = input.nextInt();    switch(option1) { case 1: System.out.println("Enter radius of sphere : "); double radius = input.nextDouble(); Sphere sp = new Sphere("Black",true,radius); System.out.println(sp); System.out.printf("\nArea of sphere: %.2f",sp.getArea()); System.out.printf("\nVolume of sphere : %.2f",sp.getVolume()); break;    case 2: System.out.println("Enter depth of cube : "); double depth = input.nextDouble(); Cube cube = new Cube("Orange",true,depth); System.out.println(cube); System.out.printf("\nArea of cube: %.2f",cube.getArea()); System.out.printf("\nVolume of cube : %.2f",cube.getVolume()); break;          default: System.out.println("Invalid option"); break; } default: System.out.println("Invalid option"); break;    }          } } Output: Enter 1. Two Dimensional Shape 2. Three Dimensional Shape Enter 1. Circle 2. Square Enter side of square : Created on Wed Oct 09 05:48:36 GMT 2019 color: Yellow filled: false Shape Type : 2D Square Side : 4.4 Area of square : 19.36 Perimeter of square : 17.60 Do ask if any doubt. Please upvote.