Question

Create a custom Exception named IllegalTriangleSideException. Create a class named Triangle. The Triangle class should contain 3 double variables containing the length of each of the triangles three sides. Create a constructor with three parameters to initialize the three sides of the triangle. Add an additional method named checkSides with method header - *boolean checkSides() throws IllegalTriangleSideException *. Write code so that checkSides makes sure that the three sides of the triangle meet the proper criteria for a triangle. It will return true if and only if the sum of side1+ side2 is greater than side3 AND the sum side2+side3 is greater than side1 AND the sum of side1+ side3 is greater than side2. If any of those three conditions is not met, the method will create and throw an IllegalTriangleSideException. Add a main method to create and check two to three different triangles.

*EDIT: Programming Language: Java*

Answer 1

IllegalTriangleSideException.java :

//Java class which extends Exception
public class IllegalTriangleSideException extends Exception {
   //constructor
   public IllegalTriangleSideException(String ex)
   {
       super(ex);//call base call constructor
   }

}

*****************************

Triangle.java :

//Java class
public class Triangle {
   // double variables
   private double side1;
   private double side2;
   private double side3;
   //constructor
   public Triangle(double s1,double s2,double s3)
   {
       side1=s1;
       side2=s2;
       side3=s3;
   }
   //method to check sides
   public boolean checkSides() throws IllegalTriangleSideException
   {
       //checking three sides of the triangle
       if((side1+ side2)>side3 && (side2+ side3)>side1 && (side1+ side3)>side2)
       {
           //if above criteria match then
           return true;//return true
       }
       else {
           throw new IllegalTriangleSideException("Invalid triangle sides");
       }
   }

}
**********************************************

TriangleTest.java :

//Java class
public class TriangleTest {
   //main() method
   public static void main(String[] args) {
       //try catch block
       try {
           //object of Triangle class
           Triangle t=new Triangle(6,5,4);
           //calling method to check Triangle
           System.out.println(t.checkSides());
       }
       catch(Exception ex)
       {
           System.out.println("Exception :"+ex);
       }

   }

}
===========================================

Screen showing details when condition is satisfied :

Screen showing details when condition is not satisfied :