Question

Design a Triangle class that extends the attached Shape class. Run the attached TestTriangle.java to test your Triangle class. You may not change attached Shape.java and TestTriangle.java. Submit chapter13.Triangle.java and TestTriangle.png.

Answer 1

Program:

import java.util.*;

abstract class Shape
{
abstract double perimeterTriangle();
abstract double areaTriangle();
}

class Triangle extends Shape
{
double side1,side2,side3,area,perimeter,s;

Triangle(double side1,double side2,double side3)
{
this.side1=side1;
this.side2=side2;
this.side3=side3;
}

double perimeterTriangle()
{
perimeter=side1+side2+side3;
return perimeter;
}

double areaTriangle()
{
s=perimeter/2;
area=Math.sqrt(s*(s-side1) * (s-side2) * (s-side3));
return area;
}
}

class TestTriangle
{
public static void main(String args[])
{
Scanner sc=new Scanner(System.in);
System.out.println("\nEnter 3 sides of Triangle: ");

double s1=sc.nextDouble();
double s2=sc.nextDouble();
double s3=sc.nextDouble();

Triangle tri=new Triangle(s1,s2,s3);
System.out.printf("\nPerimeter of Triangle: %.2f\n",tri.perimeterTriangle());
System.out.printf("\nArea of Triangle: %.2f\n",tri.areaTriangle());
System.out.print("\n\n");
}
}

Output:

Windows Powershell PS C:\Users\user\Desktop> javac TestTriangle.java PS C:\Users\user Desktop> java TestTriangle Enter 3 sides of Triangle: Perimeter of Triangle: 15.00 Area of Triangle: 9.92 PS C:\Users\user\Desktop> - Activate Windows Go to Settings to activate Windows 1:29 AM Type here to search