Write a java class Triangle that has the three sides of the triangle as attributes. It also has the following methods

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the three sides: ");

        if(scanner.hasNextDouble()) {
            double side1 = scanner.nextDouble();

            if(scanner.hasNextDouble()) {
                double side2 = scanner.nextDouble();

                if(scanner.hasNextDouble()) {
                    double side3 = scanner.nextDouble();

                    Triangle t = new Triangle(side1, side2, side3);

                    if (t.isItTriangle()) {
                        System.out.println("It is a triangle");
                        if (t.isItRight()) {
                            System.out.println("It is a right angle triangle");
                        } else {
                            System.out.println("Not a right angle triangle");
                        }
                        System.out.println("The longest side is " + t.longest());
                    } else {
                        System.out.println("It is not a triangle");
                    }
                } else {
                    System.out.println("Invalid input: please enter three numeric values");
                }
            } else {
                System.out.println("Invalid input: please enter three numeric values");
            }
        } else {
            System.out.println("Invalid input: please enter three numeric values");
        }
        scanner.close();
    }

    public static class Triangle {
        private double side1;
        private double side2;
        private double side3;

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

        public boolean isItTriangle() {
            if (side1 + side2 > side3 && side1 + side3 > side2 && side2 + side3 > side1) {
                return true;
            } else {
                return false;
            }
        }

        public boolean isItRight() {
            if (isItTriangle()) {
                double hypotenuse = Math.max(Math.max(side1, side2), side3);
                double sumOfSquares = Math.pow(side1, 2) + Math.pow(side2, 2) + Math.pow(side3, 2) - Math.pow(hypotenuse, 2);
                if (sumOfSquares == 0) {
                    return true;
                } else {
                    return false;
                }
            } else {
                return false;
            }
        }

        public double longest() {
            return Math.max(Math.max(side1, side2), side3);
        }
    }
}