Iterator loop with array
===

I just have what I'm sure is a very easy and quick question here... So let's say I have an Account class as follows:

    import java.text.NumberFormat;

    public class Account
    {
	    private final double RATE = 0.03; // interest rate of 3.5%
	    private long acctNumber;
	    private double balance;
	    private String name;
	
	    //-----------------------------------------------------------------
	    // Sets up the account by defining its owner, account number,
	    // and initial balance.
	    //-----------------------------------------------------------------
	    public Account (String owner, long account, double initial)
	    {
            name = owner;
	    	acctNumber = account;
	    	balance = initial;
    	}
    	//-----------------------------------------------------------------	
    	// Deposits the specified amount into the account. Returns the
    	// new balance.
    	//-----------------------------------------------------------------
    	public double deposit (double amount)
    	{
    		balance = balance + amount;
    		return balance;
    	}
    	//-----------------------------------------------------------------
    	// Withdraws the specified amount from the account and applies
    	// the fee. Returns the new balance.
    	//-----------------------------------------------------------------
    	public double withdraw (double amount, double fee)
    	{
    		balance = balance - amount - fee;
    		return balance;
    	}
    	//-----------------------------------------------------------------
    	// Adds interest to the account and returns the new balance.
    	//-----------------------------------------------------------------
    	public double addInterest ()
    	{
    		balance += (balance * RATE);
    		return balance;
    	}
    	//-----------------------------------------------------------------
    	// Returns the current balance of the account.
    	//-----------------------------------------------------------------
    	public double getBalance ()
    	{
    		return balance;
    	}
    	//-----------------------------------------------------------------
    	// Returns a one-line description of the account as a string.
    	//-----------------------------------------------------------------
    	public String toString ()
    	{
    		NumberFormat fmt = NumberFormat.getCurrencyInstance();
    		return acctNumber + "\t" + name + "\t" + fmt.format(balance);
    	}
    }

And I create the Bank class shown here...

    public class Bank 
    {	
    	Account[] accounts;// = new Account[30];
    	int count=0;
    	String name;
	
    	public Bank(String name)
    	{
    		this.name = name; 
    		accounts = new Account[30];
    	}
    	public void addAccount(Account acct)
    	{
    		accounts[count] = acct;
    		count++;
    	}
    	public void addInterest()
    	{
    		//for (Account acct : accounts)
    			//acct.addInterest();
    		for(int i = 0; i < count; i++)
    			accounts[i].addInterest();
    	}
    }

I receive an error if I try to use the addInterest() method with the 
for (Account acct: accounts) loop you see commented out. Can someone please provide me with insight on why this is? I thought these loops were equivalent. Thanks in advance.