Javaban hogyan tudom a mainben levo valtozo erteket megvaltoztatni funkciobol, esetleg hogyan lehet tobb return elvegezni egy funkcion belul ?

feladat:

If the user writes "fill", the program should ask them how much water, milk, coffee, and how many disposable cups they want to add to the coffee machine.

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 of coffee 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

-------------------------------------

ahogy en probalom :

public static void fillAction(int water, int milk, int coffee, int cups) {

Scanner scanner = new Scanner(System.in);

System.out.println("Write how many ml of water you want to add: ");

int waterAdd = scanner.nextInt();

water = addingValue(water, waterAdd);

~~

~~

}

public static int addingValue(int value,int input) {

return value+input;

}

atirodik de el is veszik az ertek miutan vege a fillAction() funkcionak.

Nem irtam le a tobbi valtozo erteket, de ha tobb valtozo erteket akarom megvaltoztatni egy funkcioval, azt nem lehet ? csak ha esetleg tobmen kuldenem ki egy returnon keresztul a funkcio vegen. De akkor meg azt szetkene szedni - array[0] ...es egyenkent kiszedni majd hozza adni a mainben levo valtozokhoz. Van ennek mas modja is ?