Homework 1 – v1 Solution

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Description

Question 1: You have been hired by the company “Numerical Solutions Inc” and you are in charge of their new project “LinearSolverDeluxe”.

The project’s objective is to design and implement a Java application with a single functionality: it admits as input from the user a system of linear equations and outputs its solution, if it exists, or an error message otherwise.

The customer:

  • wants the software to support at least two methods of solving linear equations: Gaussian elimination and matrix inversion.

  • wants to be able to change between solving methods dynamically.

  • might need more functionalities in the future (e.g. determinant calculation, etc).

You will:

  • Provide the class diagrams with the appropriate arrows and contents (in detail; all the methods and variables involved with the appropriate access rights), that satisfies the customer’s requirements; strive for maximum flexibility, loose coupling and minimize maintenance costs! (25 points)

  • Implement in Java the above software (user interfacing technique, way of admitting input, way of outputting, that’s all up to you). (50 points)

Question 2: after the last project, you were fed up with numerical analysis, and on the spur of the moment, you quit your job. After a few weeks of lurking at your sofa and watching depressive netflix series, you get a brilliant idea that no one has ever thought of before!

Everybody has their own list of favorite websites. But nobody wants to check them daily n times to see if they have been updated with new content (content = either text, photographs or audio)! Wouldn’t it be great if you could subscribe to your favorite website, and the websites somehow notified the subscribers of new content? So much wow, such originality! Doge is impressed. You’re certain that you’ll make millions from this and all major websites will support it!

However, as a seasoned professional (who has never heard of RSS) you must make sure that:

– it’s trivial to add and remove subscribers, as it’ll happen often a subscriber can be in the form of any software using your library. So your API must be easy to use.

  • a subscriber might be interested in only new text updates, or photograph updates or audio updates or a combination thereof. There is no need to disturb them if the update is not of the desired type. What kind of a design would support this?

  • What if users or websites demand your software to support a fourth type of content? Will it be easy to modify? It better be.

You will:

  • Provide the class diagrams with the appropriate arrows and contents (in detail, all the methods and variables involved with the appropriate access rights), that satisfy the design requirements; strive for maximum flexibility, loose coupling and minimum cost of maintenance! (25 points)


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