Kallar på den så här i main:

int bonus = c.GetBonus(c.GetDeposit(konto));

int GetBonus(int xDep) {
        int bonus;

        bonus = xDep/10;

        System.out.println("\n");

        System.out.println("Bonus : " + bonus);
        System.out.println("Deposit : " + xDep);

        int BonusDep;
        BonusDep = bonus + xDep;
        System.out.println("Bonus + Deposit: Summa = " + BonusDep );

        return bonus;
    }