Question

(JAVA)

Implement a Triangle class. Any triangle can be represented by its THREE sides.

Therefore, your class will have THREE private member variables → side1, side2 and side3. Use the double data type to represent the triangle sides.

In addition, please provide public methods that perform the following FIVE tasks:

▪ An input method that obtains the appropriate values for the three sides from the user. While entering the values of the three sides, please remember the triangle property that the sum of ANY two sides needs to be greater than the third side.

▪ A method that calculates and returns the Perimeter of the Triangle: The perimeter of a triangle is simply the sum of all three sides of the triangle. ▪ An output method that prints all three sides of the Triangle and other information (as show in the sample I/O) on the user screen. (No other methods should print out any information)

▪ A boolean method that determines whether the triangle is Equilateral: A triangle is equilateral if and only if all the THREE sides of the triangle are equal. If the triangle is equilateral, a message conveying this should be sent to the screen. If the triangle is not equilateral, then the corresponding message should be sent to the screen (for example, if a = 3.4, b = 5.6 and c = 23.7, then the output message should read → the triangle IS NOT equilateral).

• A method that calculates and returns the area of the triangle: The area of a triangle is given by the following formula: Given the three sides of the triangle (say a, b and c), S = (a + b + c)/2. Then, Area = square root (S * (S – a) * (S – b) * (S – c)).

Write the corresponding main method that tests the Triangle class and produce the following outputs:

Here is some sample output:

Please enter the value for side 1: 12.1

Please enter the value for side 2: 14.1

Please enter the value for side 3: 15. 1

The three sides that you entered are: 12.1, 13.1 and 14.1

The perimeter of the triangle is: 41.3 T

he triangle IS NOT equilateral.

The area of the triangle is: 80.11.

Answer 1

import java.util.Scanner;

public class Triangles {

        public static double perimeter(double lengths[]) {
                return lengths[0] + lengths[1] + lengths[2];
        }

        public static boolean isEquilateral(double lengths[]) {
                return (lengths[0] == lengths[1]) && (lengths[1] == lengths[2]);
        }

        public static double area(double lengths[]) {
                double p = (lengths[0] + lengths[1] + lengths[2]) / 2.0;
                return Math.sqrt(p * (p - lengths[0]) * (p - lengths[1]) * (p - lengths[2]));
        }
        
        public static void main(String[] args) {
                Scanner in = new Scanner(System.in);

                double lengths[] = new double[3];
                for (int i = 0; i < 3; i++) {
                        System.out.print("Enter length of side " + (i + 1) + ": ");
                        try {
                                lengths[i] = Double.parseDouble(in.next());
                                if (lengths[i] <= 0) {
                                        System.out.println("Error: Length can not be 0 or lesser.");
                                        i--;
                                }
                        } catch (NumberFormatException e) {
                                System.out.println("Error: Invalid number");
                                i--;
                        }
                }

                System.out.println("Three sides that you enetered are: ");
                System.out.println(lengths[0] + " " + lengths[1] + " " + lengths[2]);
                
                System.out.println("The perimeter of the triangle is: " + perimeter(lengths));
                if (isEquilateral(lengths)) {
                        System.out.println("The triangle IS equilateral.");
                } else {
                        System.out.println("The triangle IS NOT equilateral.");
                }
                
                System.out.printf("The area of the triangle is: %.2f\n", area(lengths));

                in.close();
        }

}

) return (lengths|θ] lengths!!]) && (lengths | 1] lengths[2]); := -= <terminated»Triangles (2) Dava Application CProgram Filesaadk1.8.0 73bin Enter length of side 1: 12.1 Enter length of side 2: 14.1 Enter length of side 3: 15.1 Three sides that you enete 12.1 14.1 15.1 The perimeter of the triangle is: 41.3 The triangle IS NOT equilateral The area of the triangle is: 80.1143348404824 12 13 public static double area(double lengths[]) 14 double p-(lengths[] lengths1lengths [2]) 2.8; return Math.sqrt (P (p lengths[e]) (p -lengths[1])( lengths[2])); red are 16 17 8 public static void main (String[] args) Scanner in-new Scanner(Syst 20 21 double lengths] new double[3]; for (inti- 0; i< 3; i++) f 23 24 System.out.print ("Enter length of side "+ (i+ 1) ":"); try lengths[i] Double.parseDouble(in.nextO); if (lengths[i]0) System.out.println("Error: Length can not be or lesser."); catch (NumberFormatException e) 30 31 32 System.out.println("Error: Invalid number"); 35 36 37 System.out.println("Three sides that you enetered are: "); System.out.println(lengths[e]"engths[1]lengths [2]) System.out.println( The perimeter of the triangle is: " + perimeter(lengths)); if (isEquilateral (lengths)) ( System.out.println"The triangle IS equilateral."; else System.out.println(" The triangle IS NOT equilateral."; System.out.printf("The area of the triangle İs: %.2f\n", area(lengths)); in.close); 50 51 52

   Please upvote, as i have given the exact answer as asked in question. Still in case of any issues in code, let me know in comments. Thanks!