Objektorienterad java: problem

//Instansvariabler
	private double balance;
	private float rent;
	private String account;
	private String accountNr;
	
	//Konstruktor
	public SavingsAccount(String theAccount, String theAccountNr)
	{
		balance = 0.0;
		rent = 0.5f;
		account = theAccount;
		accountNr = theAccountNr;
	}

public void deposit(int amount)
	{
		balance = balance + amount;
	}
	
	public void withdraw(double amount)
	{
		if(amount <= balance)
		{
			balance = balance - amount;
		}
		else 
		{
			System.out.print("Du försökte ta ut " + amount + " kr");
			System.out.println("men du har bara " + balance + " kr");
			System.out.println("på ditt konto!");
		}
	}


public class BankMenu
{
	private Scanner keyboard = new Scanner(System.in);
	private ArrayList<Customer> customers = new ArrayList<Customer>();
	private ArrayList<SavingsAccount> accounts = new ArrayList<SavingsAccount>();