hello I have this java program it works perfectly but the only problem is the try and catch it doesnot catch any errors it should catch strings it should only accept numbers because i am calculaTING the angles of the trinagle (the try and cacth is in the main file)

Main.java

import java.util.Scanner;

public class Main {

// main function public static void main(String[] args) {

try { Scanner input = new Scanner(System.in); // asking user to input values for sideA, // sideB and sideC System.out.println("Side A:"); double sideA = input.nextDouble(); System.out.println(" Side B:"); double sideB = input.nextDouble(); System.out.println(" Side C:"); double sideC = input.nextDouble();

// created object of class Triangle and calling different member // functions Triangle T = new Triangle(sideA, sideB, sideC); // calling GetArea() System.out.println("The area is: " + T.getArea());

// calling GetAngleA() System.out.println("Angle A is: " + T.getAngleA());

// calling GetAngleB() System.out.println("Angle B is: " + T.getAngleB());

// calling GetAngleC() System.out.println("Angle C is: " + T.getAngleC());

// calling GetName() System.out.println("The name is: " + T.getName());

// calling GetPerimeter() System.out.println("The perimeter is: " + T.getPerimeter()); catch (Exception e) { System.out.println(); System.out.println("ERROR: Invalid Input"); } } }

trinangle.java

public class Triangle { // declared private data member for side lengths // of the triangle private double sideALen; private double sideBLen; private double sideCLen;

// defined constructor for the Triangle class public Triangle(double len1, double len2, double len3) { this.sideALen = len1; this.sideBLen = len2; this.sideCLen = len3;

// checking if the triangle is a valid triangle or not. if (!this.isTriangleValid()) { System.out.println("Triangle is not valid"); } }

// defined a protected member function // it checks whether the triangle entered by // user is a valid triangle or not. protected boolean isTriangleValid() { double len1 = this.sideALen; double len2 = this.sideBLen; double len3 = this.sideCLen;

// if sum of any two sides is smaller than the third side then the triangle is not valid. // otherwise it is a valid triangle if (((len1 + len2) <= len3) || ((len2 + len3) <= len1) || ((len3 + len1) <= len2)) { return false; } return true; }

// this function returns the semi perimeter of the triangle public double getSemiPerimeter() { return 0.5 * this.getPerimeter(); }

// this function returns the area of the triangle public double getArea() { double sp = this.getSemiPerimeter(); double a = this.sideALen; double b = this.sideBLen; double c = this.sideCLen;

// using Heron's formula to compute the area of the circle return (Math.sqrt(sp * (sp - a) * (sp - b) * (sp - c))); }

// this function computes the angle A of the triangle public double getAngleA() { double a = this.sideALen; double b = this.sideBLen; double c = this.sideCLen; // using law of cosines to compute the angle of the triangle return (180.0 / Math.PI) * Math.acos(((b * b) + (c * c) - (a * a)) / (2 * b * c)); }

// this function computes the angle B of the triangle public double getAngleB() { double a = this.sideALen; double b = this.sideBLen; double c = this.sideCLen;

// using law of cosines to compute the angle of the triangle return (180.0 / Math.PI) * Math.acos(((c * c) + (a * a) - (b * b)) / (2 * c * a)); }

// this function computes the angle C of the triangle public double getAngleC() { double a = this.sideALen; double b = this.sideBLen; double c = this.sideCLen;

// using law of cosines to compute the angle of the triangle return (180.0 / Math.PI) * Math.acos(((a * a) + (b * b) - (c * c)) / (2 * a * b)); }

// this function returns the name of the triangle public String getName() { double a = this.sideALen; double b = this.sideBLen; double c = this.sideCLen;

double A = this.getAngleA(); double B = this.getAngleB(); double C = this.getAngleC();

String name = "";

// if all angles are smaller than 90 degrees then // the triangle is acute triangle if (A < 90 && B < 90 && C < 90) { name += "Acute "; }

// if one of the angles is 90 degrees, then // the triangle is right triangle else if (A == 90 || B == 90 || C == 90) { name += "Right "; }

// if one angle is greater than 90 degrees then // the triangle is obtuse triangle else if (A > 90 || B > 90 || C > 90) { name += "Obtuse "; }

// if all the sides of the triangle are equal // then the triangle is Equilateral if (a == b && b == c) { name += "Equilateral"; }

// if only two sides of the triangle are // equal, then the triangle is Isoceles else if (a == b || b == c || c == a) { name += "Isoceles"; }

// if none of the sides are equal to each other, // then the triangle is Scalene else if (a != b && b != c && c != a) { name += "Scalene"; }

// return name of the triangle return name; }

// this function returns the perimeter of the triangle public double getPerimeter() { return this.sideALen + this.sideBLen + this.sideCLen; } }