order.java

icarnegie卡耐基中ssd4练习exercise4答案 绝对正确

import java.util.*;

public class Order implements Iterable<OrderItem>{
	
	private ArrayList<OrderItem> items;
	
	public Order(){
		this.items = new ArrayList<OrderItem>();
	}

	public void addItem(OrderItem orderItem){
		this.items.add(orderItem);
	}
	
	public void removeItem(OrderItem orderItem){
		this.items.remove(orderItem);
	}
	
	public Iterator<OrderItem>iterator(){
		return this.items.iterator();
	}
	
	public OrderItem getItem(Product product){
		for(OrderItem orderitem : this.items){
			if(orderitem.getProduct().equals(product)){
				return orderitem;
			}
		}
		return null;
	}
	
	public int getNumberOfItems(){
		return this.items.size();
	}
	
	public double getTotalCost(){
		double total=0.0;
		for(OrderItem orderitem : this.items){
			total +=orderitem.getValue();
		}
		return total;
	}
	
	
	
}