(The Triangle class) Design a class named Triangle that extends GeometricObject.

Question

(The Triangle class) Design a class named Triangle that extends GeometricObject. The class contains:

Three double data fields named side1, side2, and side3 with default values 1.0 to denote three sides of the triangle.

A no-arg constructor that creates a default triangle.

A constructor that creates a triangle with the specified side1, side2, and side3.

The accessor methods for all three data fields.

A method named getArea() that returns the area of this triangle.

A method named getPerimeter() that returns the perimeter of this triangle.

A method named toString() that returns a string description for the triangle. For the formula to compute the area of a triangle, see Programming Exercise 2.19. The toString() method is implemented as follows:

return "Triangle: side1 = " + side1 + " side2 = " + side2 + " side3 = " + side3;

"Please use Eclipse to write this program"

Explanation / Answer

GeometricObject.java

public abstract class GeometricObject {
//Declaring abstract methods
public abstract double getPerimeter();
public abstract double getArea();

}

__________________

Triangle.java

public class Triangle extends GeometricObject {

   //Declaring instance variables
   double side1,side2,side3;
  
   //Zero argumented constructor
   public Triangle() {
       super();
       this.side1 = 1.0;
       this.side2 = 1.0;
       this.side3 = 1.0;
   }

   //Parameterized constructor
   public Triangle(double side1, double side2, double side3) {
       super();
       this.side1 = side1;
       this.side2 = side2;
       this.side3 = side3;
   }

   //getters and setters
   public double getSide1() {
       return side1;
   }

   public void setSide1(double side1) {
       this.side1 = side1;
   }

   public double getSide2() {
       return side2;
   }

   public void setSide2(double side2) {
       this.side2 = side2;
   }

   public double getSide3() {
       return side3;
   }

   public void setSide3(double side3) {
       this.side3 = side3;
   }

   //This method will calculates the perimeter of the Triangle
   @Override
   public double getPerimeter() {
      
       return side1+side2+side3;
   }

   //This method will calculates the area of the Triangle
   @Override
   public double getArea() {
       double p=(side1+side2+side3)/2;
       double area=Math.sqrt(p*(p-side1)*(p-side2)*(p-side3));
       return area;
   }

   //toString method is used to display the contents of an object inside it
   @Override
   public String toString() {
       return "Triangle :side1=" + side1 + ", side2=" + side2 + ", side3="+ side3;
   }

}

_______________________

Test.java

import java.util.Scanner;

public class Test {

   public static void main(String[] args) {
       //Declaring variables
       double side1,side2,side3;
      
       //Scanner object is used to get the inputs entered by the user
       Scanner sc=new Scanner(System.in);
      
       //getting the inputs entered by the user
       System.out.print("Enter side1 :");
       side1=sc.nextDouble();
      
       System.out.print("Enter side2 :");
       side2=sc.nextDouble();
      
       System.out.print("Enter side3 :");
       side3=sc.nextDouble();
      
       //Creating an object of Triangle class by pasing the user entered inputs
       Triangle t=new Triangle(side1, side2, side3);
      
//Displaying the area of the Triangle
       System.out.printf("Area of The Triangle is :%.2f ",t.getArea());
      
       //Displaying the Perimeter of the Triangle
       System.out.println("Perimeter of The Triangle is :"+t.getPerimeter());

   }

}

______________________

Output:

Enter side1 :4.5
Enter side2 :5.0
Enter side3 :5.5
Area of The Triangle is :10.61
Perimeter of The Triangle is :15.0

______________Thank You

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