cart.java

网上购物车的JAVA代码实现版

package feng.shoppingcart.biz;
import java.util.*;
import java.io.Serializable;

import feng.shoppingcart.entity.Item;
public class Cart implements Serializable{
	private HashMap<Integer,Item> items=new HashMap<Integer,Item>();
	private double cost=0;
	private Collection<Item> ite=new HashSet<Item>();
	public Cart (){}
	public Collection<Item> getIte(){
		ite=new HashSet<Item>();
		Set keys=items.keySet();
		Iterator iter=keys.iterator();		
		while (iter.hasNext()){
			Integer key=(Integer)iter.next();
			Item item=items.get(key);
			ite.add(item);
		}
		return ite;
	}
	public void addItem(Item item)throws Exception{
		item.setNumber(1);
		item.setCost(item.getProduct().getPrice());
		items.put(item.getProduct().getId(), item);
	}
	
	public void modigyItemNumber(Item item)throws Exception{
		item.setCost(item.getProduct().getPrice()*item.getNumber());
		items.put(item.getProduct().getId(), item);
	}
	public void removeItemByProductId(Integer productId)throws Exception{
		items.remove(productId);
	}
	public void clear()throws Exception{	
		items.clear();
	}
	public boolean isEmpty()throws Exception{
		if(items.isEmpty())	return true;
		else	return false;
	}
	
	public HashMap<Integer, Item> getItems() throws Exception{
		return items;
	}

	public void setItems(HashMap<Integer, Item> items)throws Exception {
		this.items = items;
	}

	public double getCost() throws Exception{
		cost=0.0;
		Set keys=items.keySet();
		Iterator iter=keys.iterator();		
		while (iter.hasNext()){
			Integer key=(Integer)iter.next();
			Item item=items.get(key);
			cost=item.getCost()+cost;
		}
		return cost;
	}


	
}