sales.java

icarnegie卡耐基中ssd4练习exercise4答案 绝对正确

import java.util.*;

public class Sales implements Iterable<Order>{

	private ArrayList<Order> orders;
	
	public Sales(){
		this.orders = new ArrayList<Order>();
	}
	
	public void addOrder(Order order) {
		this.orders.add(order);
	}
	
	public Iterator<Order> iterator() {
		return this.orders.iterator();
	}
	
	public int getNumberOfOrders(){
		return this.orders.size();
	}	
}