Question

Implement the Shape hierarchy -- create an abstract class called Shape, which will be the parent class to TwoDimensionalShape and ThreeDimensionalShape. The classes Circle, Square, and Triangle should inherit from TwoDimensionalShape, while Sphere, Cube, and Tetrahedron should inherit from ThreeDimensionalShape. Each TwoDimensionalShape should have the methods getArea() and getPerimeter(), which calculate the area and perimeter of the shape, respectively. Every ThreeDimensionalShape should have the methods getArea() and getVolume(), which respectively calculate the surface area and volume of the shape. Every class should have a member variable containing its dimensions -- for example, the Circle class should have a member variable describing its radius, while the Triangle class should have three member variables describing the length of each side. Note that the Tetrahedron cass should describe a regular tetrahedron, and as such, should only have one member variable. Create a Driver class with a main method to test your Shape hierarchy. The program should prompt the user to enter the type of shape they'd like to create, and then the shape's dimensions. If the shape is two dimensional, the program should print its area and its perimeter, and if it's a three dimensional shape, its surface area and volume.

Answer 1

abstract class Shape {
}
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abstract class TwoDimensionalShape extends Shape {
abstract double getArea();
abstract double getPerimeter();
}
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abstract class ThreeDimensionalShape extends Shape {
public abstract double getArea();
public abstract double getVolume();
}
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class Circle extends TwoDimensionalShape {
private double radius;
Circle(double r) {
radius = r;
}
public double getArea() {
double area = Math.PI * Math.pow(radius, 2);
  
return Math.round(area * 100.00) / 100.00;
}
public double getPerimeter() {
double peri = 2 * Math.PI * radius;
return Math.round(peri * 100.00) / 100.00;
}
}
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class Square extends TwoDimensionalShape {
private double side;
Square(double s) {
side = s;
}
public double getArea() {
double area = Math.pow(side, 2);
return Math.round(area * 100.0) / 100.0;
}
public double getPerimeter() {
double peri = side + side + side + side;
return Math.round(peri * 100.0) / 100.0;
}
}
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class Triangle extends TwoDimensionalShape {
private double base;
private double side2;
private double side3;
  
Triangle(double s1, double s2, double s3) {
base = s1;
side2 = s2;
side3 = s3;
  
  
}
public double getArea() {
double s = (base + side2 + side3) / 2;
double area = Math.sqrt(s * (s - base) * (s - side2) * (s - side3));
return Math.round(area * 100.0) / 100.0;
}
public double getPerimeter() {
double peri = base + side2 + side3;
return Math.round(peri * 100.0) / 100.0;
}
}
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class Cube extends ThreeDimensionalShape {
private double side;
Cube(double s) {
side = s;
}
public double getArea() {
double area = 6 * Math.pow(side, 2);
return area;
}
public double getVolume() {
double volume = Math.pow(side, 3);
return Math.round(volume * 100.00) / 100.00;
}
}
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class Sphere extends ThreeDimensionalShape {
private double radius;
Sphere(double r) {
radius = r;
}
public double getArea() {
double area = 4 * Math.PI * Math.pow(radius, 2);
return Math.round(area * 100.0) / 100.0;
}
public double getVolume() {
double volume = (1.33333 * Math.PI * Math.pow(radius, 3));
return Math.round(volume * 100.0) / 100.0;
}
}
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class Tetrahedron extends ThreeDimensionalShape {
private double edge;
Tetrahedron(double s) {
edge = s;
}
public double getArea() {
double area = Math.sqrt(3) * Math.pow(edge, 2);
return Math.round(area * 100.00) / 100.00;
}
public double getVolume() {
double volume = Math.pow(edge, 3) / (6 * Math.sqrt(2));
return Math.round(volume * 100.00) / 100.00;
}
}
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// Driver.java
import java.util.Scanner;
public class Driver {
public static void main(String... str) {
int choice = 0;
int c2 = 0;
int c3 = 0;
Scanner sc = new Scanner(System.in);
System.out.println("Enter");
System.out.println("1)Two dimensional shape");
System.out.println("2)Three dimensional shape");
System.out.print("Enter Choice :");
choice = sc.nextInt();
if (choice == 1) {
System.out.println("Enter");
System.out.println("1)Circle");
System.out.println("2)Square");
System.out.println("3)Triangle");
System.out.print("Enter Choice :");
c2 = sc.nextInt();
switch (c2) {
case 1:
System.out.print("Enter radius of circle:");
double rad = sc.nextDouble();
TwoDimensionalShape c = new Circle(rad);
System.out.println("Area: " + c.getArea() + " ");
System.out.println("Perimeter:"
+ String.format("%.2f", c.getPerimeter()));
break;
case 2:
System.out.print("Enter side of square:");
double side1 = sc.nextDouble();
TwoDimensionalShape s = new Square(side1);
System.out.println("Area: " + s.getArea());
System.out.println("Perimeter:"+ String.format("%.2f", s.getPerimeter()));
break;
case 3:
System.out.print("Enter side of triangle:");
double s1 = sc.nextDouble();
System.out.print("Enter side of triangle:");
double s2 = sc.nextDouble();
System.out.print("Enter side of triangle:");
double s3 = sc.nextDouble();
TwoDimensionalShape r = new Triangle(s1, s2, s3);
System.out.println("Area: " + r.getArea() + " ");
System.out.println("Perimeter: "+ String.format("%.2f", r.getPerimeter()));
break;
  
}
} else if (choice == 2) {
System.out.println("Enter");
System.out.println("1)Sphere");
System.out.println("2)Cube");
System.out.println("3)Tetrahedron");
System.out.print("Enter Choice :");
c3 = sc.nextInt();
switch (c3) {
case 1:
System.out.print("Enter radius of sphere:");
double radx = sc.nextDouble();
ThreeDimensionalShape cc2 = new Sphere(radx);
System.out.println("Surface area: "
+ String.format("%.2f", cc2.getArea()) + " ");
System.out.println("Volume: "
+ String.format("%.2f", cc2.getVolume()));
break;
case 2:
System.out.print("Enter side of cube: ");
double sx = sc.nextDouble();
ThreeDimensionalShape cc1 = new Cube(sx);
System.out.println("Area: "
+ String.format("%.2f", cc1.getArea()) + " ");
System.out.println("Volume: "
+ String.format("%.2f", cc1.getVolume()));
break;
case 3:
System.out.print("Enter side of tetrahedron: ");
double tx = sc.nextDouble();
ThreeDimensionalShape cc3 = new Tetrahedron(tx);
System.out.println("Area: " + cc3.getArea() + " ");
System.out.println("Volume: " + cc3.getVolume());
break;
  
}
} else {
System.out.println("choice is invalid");
}
sc.close();
}
}
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Output:
Enter
1)Two dimensional shape
2)Three dimensional shape
Enter Choice :1
Enter
1)Circle
2)Square
3)Triangle
Enter Choice :1
Enter radius of circle:1.56
Area: 7.65
Perimeter:9.80
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Output#2:
Enter
1)Two dimensional shape
2)Three dimensional shape
Enter Choice :1
Enter
1)Circle
2)Square
3)Triangle
Enter Choice :2
Enter side of square:3
Area: 9.0
Perimeter:12.00
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Output#3:
Enter
1)Two dimensional shape
2)Three dimensional shape
Enter Choice :1
Enter
1)Circle
2)Square
3)Triangle
Enter Choice :3
Enter side of triangle:3
Enter side of triangle:4
Enter side of triangle:5
Area: 6.0
Perimeter: 12.00
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Output#4:
Enter
1)Two dimensional shape
2)Three dimensional shape
Enter Choice :2
Enter
1)Sphere
2)Cube
3)Tetrahedron
Enter Choice :1
Enter radius of sphere:5.5
Surface area: 380.13
Volume: 696.91

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