https://github.com/tbouron/java-basics-exercises

https://github.com/tbouron/java-basics-exercises

Last synced: about 1 month ago
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• Host: GitHub
• URL: https://github.com/tbouron/java-basics-exercises
• Owner: tbouron
• Created: 2016-01-08T14:44:24.000Z (about 9 years ago)
• Default Branch: master
• Last Pushed: 2016-01-12T17:10:20.000Z (almost 9 years ago)
• Last Synced: 2024-10-16T20:51:51.776Z (3 months ago)
• Language: Java
• Size: 6.84 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
Java Basics - Exercises

===

By running this program, here is what you should see in a console:

````

[Bike state] gear: 1 - speed: 4

[Bike state] gear: 2 - speed: 10

[Bike state] gear: 3 - speed: 39

[Bike state] gear: 7 - speed: 287

```

Exercise 1

====

Create a Bicycle interface that extends from Vehicle and contains the `Bike#changeGear(int gear)` method.

Make the Bike class implement this new interface and run this program again. The output should remain unchanged.

Exercise 2

====

Make the gear and speed initialisation through a Bike constructor.

Exercise 3

====

Use the if-then-else statement to ensure that the gear is always between 1 and `Bike#MAX_GEAR`.

All invalid values will just be discarded for now. Run this program again, the last gear change shouldn't happen,

the output should look like this:

```

[Bike state] gear: 1 - speed: 4

[Bike state] gear: 2 - speed: 10

[Bike state] gear: 3 - speed: 39

[Bike state] gear: 3 - speed: 45

```

Exercise 4

====

Create 2 subclasses of `Bike`: `TandemBike` and `MountainBike`.

`TandemBike` will implement the `Horn` interface by making the sound: `2 seater!`.

`MountainBike` will override the `Bike#brake(int speedDelta)` method as it can brake 2 times harder.

Exercise 5

====

Replace in the main method the: `Bike bike = new Bike();` by `BrokenBike bike = new BrokenBike();`. The program

will outpout only this then stop because an exception is thrown

```

[Bike state] gear: 1 - speed: 4

[Bike state] gear: 2 - speed: 10

Exception in thread "main" com.cloudsoft.java.basics.GearException: The gear number 3 is broken!

....

```

Catch this exception, display the error message to the console, change to a closest lower gear then do one brake of "2".

The output should now look like that:

```

[Bike state] gear: 1 - speed: 4

[Bike state] gear: 2 - speed: 10

The gear number 3 is broken!

[Bike state] gear: 2 - speed: 8

```