[Java] Implement new Concept Exercise: constructors

[mirkoperillo]

This issue describes how to implement the constructors concept exercise for the Java track.

Getting started

Please please please read the docs before starting. Posting PRs without reading these docs will be a lot more frustrating for you during the review cycle, and exhaust Exercism's maintainers' time. So, before diving into the implementation, please read up on the following documents:

• The features of v3.
• Rationale for v3.
• What are concept exercise and how they are structured?

Please also watch the following video:

• The Anatomy of a Concept Exercise.

Goal

The goal of the exercise is to learn how to use constructor methods to instantiate classes

Learning objectives

• Know what constructors are
• Know how to define parameterless constructors
• Know how to define parameterized constructors

Out of scope

• Constructor overloading
• Private constructors
• Static constructors

Concepts

• constructors: know what constructors are; know how to define parameterless constructors; know how to define parameterized constructors; know how to use constructor overloading; know how to define private constructors.

Prequisites

• classes: know how to work with classes.
• numbers: know how compare numbers.
• conditionals: know how to do conditional logic.

Resources to refer to

Hints

Nothing to report

After

Nothing to report

Representer

This exercise does not require any specific representation logic to be added to the representer

Analyzer

This exercise does not require any specific analyzer logic to be added to the analyzer

Implementing

To implement this exercise, please follow these instructions.

Help

If you have any questions while implementing the exercise, please post the questions as comments in this issue.

[ystromm]

Looks reasonable to port the c# version. What do you think?

[mirkoperillo]

@ystromm absolutely yes. Let me know if you can be interested in implement this

[ystromm]

Sure I can give it a try!

[mirkoperillo]

Fixed by #2255