This service class is intended to contain the basic logic for deposits and withdrawls to a bank account

* Separating menu logic and bank logic is good for two reasons: it makes both classes as simple

* as they could be, and it also makes this class capable of being tested with automated tests, since testing

* a class that receives user input is difficult.

*/

public class BankService {

/**

* The balance should be kept private. If it were public, then other developers could write code in other classes

* that could cause the balance to exhibit unintended behavior, like being negative. The private access modifier

* will allow only the methods within this class to interact with the balance.

*/

private double balance;

/**

* A constructor to build a BankService object that will start the bank balance at 0. There is no need to change

* anything in this constructor.

*/

public BankService(){

this.balance = 0;

}

/**

* TODO: implement functionality to increase the user's balance by amount.

* @param amount the amount to be deposited.

*/

public void deposit(double amount){

}

/**

* TODO: implement functionality to decrease the user's balance by an amount.

* If a withdrawl would result in the user having a negative balance, the withdrawl should not occur.

* @param amount the amount to be withdrawn.

*/

public void withdraw(double amount){

}

/**

* TODO: return the balance.

* @return the user's balance.

*/

public double getBalance(){

return 0;

}

}