Java Exercises

To learn the Java language, only for french speaking people, I recommend you go to OpenClassrooms.

As an IDE, I recommend IntelliJ Community

The exercises will be built-on the result of the previous exercises. If you get blocked, you can open an issue.

I can review your code if you want. For it, simply make a pull-request on this project. If you are not familiar with git, you can learn the basis of it here

In order to run your code, you can either use or IDE or type gradle by typing this line in your terminal : ./gradlew run.

First exercise

You will build a parking of vehicles. The properties of your parking will be :

• A parking contains a maximum of 10 vehicles
• It is possible to park or remove a vehicle from the parking
• A vehicle has, at least, a make, a model, a color, a weight and a number of wheels.
• A parking can tell how many vehicles are parked-in, how many slots are available and the sum of the weight of the vehicle parked-in it.

Hint : you will need to be familiar with the notions of : variables - conditions - loops - arrays - class

Second exercise

• A parking can now contain a maximum of N vehicles, N being passed as an argument of the constructor of Parking.
• A vehicle can be either a Car, a Motorcycle or a Truck
• It is impossible to create a new Vehicle. So, writing new Vehicle(...) must not compile.
• The list of vehicle in the parking must be of type List

Hint : you will need to be familiar with the notions of heritage, abstract classes and collections of objects.

Third exercise

• Now the constructor of all your classes must be private. Implement the Factory pattern.

Fourth exercise

• The parking now has N floor and M aisles per floor. Each aisles contains K parking slots.
• Every floor contains the same amount of aisles and every aisles contains the same amount of parking slots.
• An aisle is identified by a letter of your choice in a floor.
• A floor is identified by a number in the parking.
• A parking slot has 2 states : free or occupied.
• A parking slot has a vehicle parked on it, or not. Of course the vehicle is of the same type as the parking slot can store.
• The parking must be able to give the amount of slots that are available/occupied per floor, per aisle and in the whole parking.
• The constructor of Parking must be private.
• The constructor of the vehicles can be public anymore. Car, Truck and Motorcycle do not require a Builder.
• Vehicle must stay abstract.

Hint : take a look at the Optional class in Java. You will also need to be familiar with the notion of generic classes.

Fifth exercise

• Follow this tutorial : http://www.baeldung.com/java-optional
• Complete all the function from the file ParkingUtils
• In the mean time, implement the same method in a fully imperative way ImperativeParkingUtils

Hint : search for tutorials about Java 8 streams

Sixth exercise

• A parking slot can now be a ParkingSlot of any subclass of Vehicle. So a parking slot can welcome a Car OR a Motorcycle OR a Truck.
• A Garage can make a few transformations on a car : changing its color, fixing it (which means that the car can now be broken ;) ) and any other transformation you think about.
• All objects across the app are still immutable (except the builders).

Seventh exercise

• Replace your huge Main with unit tests

Hint : you will need JUnit + take a look a what a Fixture is.

Eight exercise

• Connect your app to the database of your choice and make your app persistent

Server exercise

• Clone the project and go the the server_exercise package.
• Then open functional.Main and imperative.Main and do what's indicated in the comments.

You can read some articles about functional programming here :

- https://fr.wikipedia.org/wiki/Programmation_fonctionnelle - https://flyingbytes.github.io/programming/java8/functional/part1/2017/01/23/Java8-Part1.html - http://projectreactor.io/docs/core/release/reference/#intro-reactive (only part 3)