This project simulates a coffee machine.
The machine works with typical products: coffee, milk, sugar, and plastic cups; if it runs out of something, it shows a notification.
One can get three types of coffee: espresso, cappuccino, and latte. Since nothing’s for free, it also collects the money.
In this stage, a number of texts is printed out to the console.
Stage implementation: SimpleCoffeeMachine.kt
Example:
Starting to make a coffee
Grinding coffee beans
Boiling water
Mixing boiled water with crushed coffee beans
Pouring coffee into the cup
Pouring some milk into the cup
Coffee is ready!
In this stage:
-
The numbers of needed coffee drinks is read from the input.
-
The program figures out how much of each ingredient the machine will need.
One cup of coffee made on this coffee machine contains
200ml of water,50ml of milk, and15g of coffee beans. -
The required ingredient amounts is printed to the user.
Stage implementation: IngredientsCalculator.kt
Example:
Write how many cups of coffee you will need:
> 125
For 125 cups of coffee you will need:
25000 ml of water
6250 ml of milk
1875 g of coffee beans
A real coffee machine doesn't have an infinite supply of water, milk, or coffee beans. And if one inputs a huge number, it's almost certain that a real coffee machine wouldn't have the supplies needed to make all that coffee for them.
In this stage, the program will check amounts of water, milk, and coffee beans available in the coffee machine at the moment.
Stage implementation: ServingsCalculator.kt
Example 1:
Write how many ml of water the coffee machine has:
> 1550
Write how many ml of milk the coffee machine has:
> 299
Write how many grams of coffee beans the coffee machine has:
> 300
Write how many cups of coffee you will need:
> 3
Yes, I can make that amount of coffee (and even 2 more than that)
Example 2:
Write how many ml of water the coffee machine has:
> 500
Write how many ml of milk the coffee machine has:
> 250
Write how many grams of coffee beans the coffee machine has:
> 200
Write how many cups of coffee you will need:
> 10
No, I can make only 2 cups of coffee
Example 3:
Write how many ml of water the coffee machine has:
> 300
Write how many ml of milk the coffee machine has:
> 65
Write how many grams of coffee beans the coffee machine has:
> 100
Write how many cups of coffee you will need:
> 1
Yes, I can make that amount of coffee
In this stage, the program is extended and now can perform either of three tasks, buying a coffee, filling the machine, and depositing money.
On each task's completion, it outputs the amount of current ingredients and left money, and exits.
Stage implementation: CoffeeMachine.kt
Example 1:
The coffee machine has:
400 ml of water
540 ml of milk
120 g of coffee beans
9 disposable cups
$550 of money
Write action (buy, fill, take):
> fill
Write how many ml of water you want to add:
> 2000
Write how many ml of milk you want to add:
> 500
Write how many grams of coffee beans you want to add:
> 100
Write how many disposable cups you want to add:
> 10
The coffee machine has:
2400 ml of water
1040 ml of milk
220 g of coffee beans
19 disposable cups
$550 of money
Example 2:
The coffee machine has:
400 ml of water
540 ml of milk
120 g of coffee beans
9 disposable cups
$550 of money
Write action (buy, fill, take):
> take
I gave you $550
The coffee machine has:
400 ml of water
540 ml of milk
120 g of coffee beans
9 disposable cups
$0 of money
Continuing to expand the coffee machine's functionalities, now our coffee machine works endlessly and supports even more tasks.
The customer can now choose to buy, fill, take, remaining, and exit.
buy: The action of buying coffee displays a menu of available coffee drinks the customer can choose, each one having their own price and required ingredients.
- For the espresso, the coffee machine needs 250 ml of water and 16 g of coffee beans. It costs $4.
- For the latte, the coffee machine needs 350 ml of water, 75 ml of milk, and 20 g of coffee beans. It costs $7.
- And for the cappuccino, the coffee machine needs 200 ml of water, 100 ml of milk, and 12 g of coffee. It costs $6.
The customer can revert their action of buying a coffee, by choosing back option, in case they change their mind.
fill: Filling up the coffee machine with provided amount of ingredients (water, milk, coffee beans, and disposable cups).
take: Deposits the available money
remaining: Displays available ingredients and money in the coffee machine.
exit: Terminates the program
Remaining, displays the amount of available ingredients and money in the machine.
In stage 6, the program's functionality is not changed, rather the code is refactored, a new method to represent all actions the machine can do is added, based on its current state.
Stage implementation: SimultaneousCoffeeMachine.kt
Note: The above implementation matches for both stages 5 and 6.
Example:
Write action (buy, fill, take, remaining, exit):
> remaining
The coffee machine has:
400 ml of water
540 ml of milk
120 g of coffee beans
9 disposable cups
$550 of money
Write action (buy, fill, take, remaining, exit):
> buy
What do you want to buy? 1 - espresso, 2 - latte, 3 - cappuccino, back - to main menu:
> 2
I have enough resources, making you a coffee!
Write action (buy, fill, take, remaining, exit):
> remaining
The coffee machine has:
50 ml of water
465 ml of milk
100 g of coffee beans
8 disposable cups
$557 of money
Write action (buy, fill, take, remaining, exit):
> buy
What do you want to buy? 1 - espresso, 2 - latte, 3 - cappuccino, back - to main menu:
> 2
Sorry, not enough water!
Write action (buy, fill, take, remaining, exit):
> fill
Write how many ml of water you want to add:
> 1000
Write how many ml of milk you want to add:
> 0
Write how many grams of coffee beans you want to add:
> 0
Write how many disposable cups you want to add:
> 0
Write action (buy, fill, take, remaining, exit):
> remaining
The coffee machine has:
1050 ml of water
465 ml of milk
100 g of coffee beans
8 disposable cups
$557 of money
Write action (buy, fill, take, remaining, exit):
> buy
What do you want to buy? 1 - espresso, 2 - latte, 3 - cappuccino, back - to main menu:
> 2
I have enough resources, making you a coffee!
Write action (buy, fill, take, remaining, exit):
> remaining
The coffee machine has:
700 ml of water
390 ml of milk
80 g of coffee beans
7 disposable cups
$564 of money
Write action (buy, fill, take, remaining, exit):
> take
I gave you $564
Write action (buy, fill, take, remaining, exit):
> remaining
The coffee machine has:
700 ml of water
390 ml of milk
80 g of coffee beans
7 disposable cups
$0 of money
Write action (buy, fill, take, remaining, exit):
> exit