Thread: Novice with java methods, please help!

I need help creating this program and i am completely new to methods i only know the basic syntax for a method. i want to design a algorithm for my process first and from there hopefully come up with some code...

Write a program that reads in three real numbers representing the sides of a triangle. The program determines whether the numbers represent a valid triangle, and if so computes the area of the triangle. If the input does not represent a valid triangle an appropriate message should be displayed to the user. Solve this problem by creating a MyTriangle class which, in addition to the main method, contains the following two methods:

  // Returns true if the sum of any two sides is greater than the third side. 
 
public static boolean isValid(double side1, double side2, double side3)
 
 
 
// Returns the area of the triangle.
 
public static double area(double side1, double side2, double side3)

The area can be found by taking the square root of s(s – side1)(s – side2)(s – side3),

where s = (side1 + side2 + side3)/2



Include the following two sets of numbers among your test cases:

3.0 4.0 5.0

3.2 4.4 7.8


Heres what i have, still new to java methods so not sure where to start.....

import java.util.Scanner;
 
public class AreaOfTriangle{
     public static void main(String [] args){
 
          Scanner input = new Scanner(System.in);
 
          System.out.println("Enter a number representing the side of a triangle ")
          double side1 = input.nextDouble();
 
          System.out.println("Enter the second side of the triangle ")
          double side2 = input.nextDouble();
 
          System.out.println("Enter final side of triangle ")
          double side3 = input.nextDouble();
     }
}

well , to determine if u can create a triangle to begin with u need to check that 2 of the sides added together don't equal less than the largest side

this could be a simple if chain

 
public static boolean isValid(double side1, double side2, double side3){
boolean returnable = false;
 
  if ( side1+ side2 <= side3){
     if (side2 + side3 <= side 1){
       if (side 1 + side3 <= side2){
         returnable = false;
       }else{
       returnable = true;
       }
    else {
     returnable = true;
    }
  else {
     returnable = true;
    }
  }
  return returnable;
}

untested but the logic should work
if statement 1 = true ,then u cant make a triangle , check statement 2
if statement 2 = true ,then u cant make a triangle , check statement 3
if statement 1 = true ,then u cant make a triangle at all , set the return value to false and return it
else if any of the above = false then a triangle can be made , set return value to true and return it


for the other method u will need to import the java.lang.StrictMath to use

public static double area(double side1, double side2, double side3){
   double s = sqrt( (side1 + side2 + side3) / 2 ) ;
   s = s * (s - side 1) * ( s - side2 ) * (s - side3 );
   return s;
}

i used the formula u gave for it