Question

Write a simple java class that contains the following three methods:

1. isosceles -- accepts 3 integers which represent the sides of a triangle. Returns true if the triangle is isosceles and false otherwise.

2. perimeter - accepts 3 integers that represent the sides of a triangle and returns the perimeter of the triangle.

3. area -- accepts 3 integers, which represent the sides of a triangle and calculates and returns the area of the triangle. Hint: use Heron's formula. You must call the perimeter method from this method.

4. maxSide -- accepts 3 integers, which represent the sides of a triangle. Returns the maximum side.

Answer 1

Code:

import java.util.Scanner;
import java.lang.Math;
class triangle
{
   public boolean isosceles(int a,int b,int c)
   {
       if(a==b||b==c||c==a)
       {/*If 2 sides are equal then we return true*/
           return true;
       }
       else
       {/*Else we return false*/
           return false;
       }
   }
   public int perimeter(int a,int b,int c)
   {/*Return the perimeter which is sum of sides*/
       return a+b+c;
   }
   public double area(int a,int b,int c)
   {/*Area */
       double s=perimeter(a,b,c)/2;/*Calculating s*/
       return Math.sqrt(s*(s-a)*(s-b)*(s-c));/*Returning the area*/
   }
   public int maxSide(int a,int b,int c)
   {
       return (a>b && a>c)?a:(b>c)?b:c;/*Returning the max side*/
   }
   public static void main(String[] args)
   {
       int a,b,c;
       Scanner scnr=new Scanner(System.in);/*Scanner object*/
       System.out.print("Enter the three sides of the triangle:");
       a=scnr.nextInt();
       b=scnr.nextInt();
       c=scnr.nextInt();/*Reading the three sides of the triangle*/
       triangle tr=new triangle();/*Triangle object tr*/
       if(tr.isosceles(a,b,c))
       {/*If isosceles we print isoscles triangle*/
           System.out.println("The triangle is a isosceles triangle");
       }
       else
       {/*else we print not a isoscles triangle*/
           System.out.println("The triangle is not a isosceles triangle");
       }
       System.out.println("Area of the triangle:"+tr.area(a,b,c));/*Printing the area*/
       System.out.println("Maximum side:"+tr.maxSide(a,b,c));/*Printing the maximum side*/
   }

}

Output:

Indentation: