public class Money {

	public static final Money ZERO = new Money(0);
	private int pence;

	private Money(int pence) {
		this.pence = pence;
	}

	public static Money fromPence(int pence) {
		return new Money(pence);
	}

	public Money add(Money other) {
		return new Money(pence + other.pence);
	}
	
	public Money subtract(Money other) {
		return new Money(pence - other.pence);
	}
	
	@Override
	public boolean equals(Object other) {
		Money m = (Money) other;
		return pence == m.pence;
	}
	
	@Override
    public int hashCode() {
		return new Integer(pence).hashCode();
    }
	
	@Override
	public String toString() {
		return "" + pence + "p";
	}

}