Triangles

Brief

Write a program that will determine the type of a triangle. It should take the lengths of the triangle's three sides as input, and return whether the triangle is equilateral, isosceles or scalene.We are looking for solutions that showcase problem solving skills and structural considerations that can be applied to larger and potentially more complex problem domains. Pay special attention to tests, readability of code and error cases.

How to use

In Java code

The core functionality is implemented by the class eu.throup.triangles.domain.Triangle. To use, simply instantiate a new Triangle object and call its classify() method:

import eu.throup.triangles.domain.Triangle;

class Example {
    public Example() {
        Triangle triangle = new Triangle(3, 4, 5);
        Triangle.Type result = triangle.classify();
    }
}

A Triangle object may be constructed with 3 double parameters (or anything implictly convertable) representing the three side lengths. Triangle.classify() will return an Triangle.Type from the following list:

Triangle.Type.EQUILATERAL
Triangle.Type.ISOSCELES
Triangle.Type.SCALENE

If invalid values are given in the constructor, an IllegalArgumentException will be thrown during instantiation. The exception may take one of the following specialisations:

Exception	Reason
`ImpossibleTriangleException`	The given side lengths do not satisfy the triangle inequality.
`NegativeSideException`	A given side length is negative.
`NonFiniteSideException`	A given side length is infinite or not a number.

As a web application

A simple web application can be deployed in the form of Java WAR package; for example, running in Jetty or Tomcat.

A Maven goal exists to compile and launch the web application with Jetty:

$ mvn jetty:run-war

This should lead to the application running on http://localhost:8080/ .

Development

The project includes a full set of JUnit tests and Cucumber features. To execute the full test suite, you may use Maven:

$ mvn test

To compile and package as a WAR package:

$ mvn package

throup / triangles