## Introduction

In this demo I have used NetBeans IDE 8.2 for debugging purpose. But you can use any java programming language compiler as per your availability..

import java.util.Scanner; public class Javaexcercise { public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.print("Input Side-1: "); double side1 = in.nextDouble(); System.out.print("Input Side-2: "); double side2 = in.nextDouble(); System.out.print("Input Side-3: "); double side3 = in.nextDouble(); System.out.println( isValid(side1, side2,side3) ? "The area of the triangle is " + areaoftriangle(side1, side2, side3) : "Invalid triangle" ); } public static boolean isValid(double side1, double side2, double side3) { if( side1 + side2 > side3 && side2 + side3 > side1 && side1 + side3 > side2) return true; else return false; } public static double areaoftriangle(double side1, double side2, double side3) { double area = 0; double s = (side1 + side2 + side3)/2; area = Math.sqrt(s*(s - side1)*(s - side2)*(s - side3)); return area; } }