package junit.samples.money;/** * A simple Money. * */public class Money implements IMoney {	private int fAmount;	private String fCurrency;	/**	 * Constructs a money from the given amount and currency.	 */	public Money(int amount, String currency) {		fAmount= amount;		fCurrency= currency;	}	/**	 * Adds a money to this money. Forwards the request to the addMoney helper.	 */	public IMoney add(IMoney m) {		return m.addMoney(this);	}	public IMoney addMoney(Money m) {		if (m.currency().equals(currency()) )			return new Money(amount()+m.amount(), currency());		return MoneyBag.create(this, m);	}	public IMoney addMoneyBag(MoneyBag s) {		return s.addMoney(this);	}	public int amount() {		return fAmount;	}	public String currency() {		return fCurrency;	}	@Override	public boolean equals(Object anObject) {		if (isZero()) 			if (anObject instanceof IMoney)				return ((IMoney)anObject).isZero();		if (anObject instanceof Money) {			Money aMoney= (Money)anObject;			return aMoney.currency().equals(currency())							 && amount() == aMoney.amount();		}		return false;	}	@Override	public int hashCode() {		if (fAmount == 0)			return 0;		return fCurrency.hashCode()+fAmount;	}	public boolean isZero() {		return amount() == 0;	}	public IMoney multiply(int factor) {		return new Money(amount()*factor, currency());	}	public IMoney negate() {		return new Money(-amount(), currency());	}	public IMoney subtract(IMoney m) {		return add(m.negate());	}	@Override	public String toString() {		StringBuffer buffer = new StringBuffer();		buffer.append("["+amount()+" "+currency()+"]");		return buffer.toString();	}	public /*this makes no sense*/ void appendTo(MoneyBag m) {		m.appendMoney(this);	}}