shoppingcart.java

网上购物系统 管理员模块和用户模块

package m;

import java.util.ArrayList;

public class ShoppingCart {

	private ArrayList<OrderItem> list;
	
	public ShoppingCart()
	{
		list=new ArrayList<OrderItem>();
	}
	
	public ArrayList<OrderItem> getList()
	{
		return this.list;
	}
	public void addOrderItem(int ID)
	{
		for (int i = 0; i < list.size(); i++) {
			OrderItem temp=list.get(i);
			if(temp.getItemID()==ID)
			{
				temp.setNum(temp.getNum()+1);
				return;
			}
		}
		OrderItem newOrderItem=new OrderItem(Catalog.getItem(ID),1);
		list.add(newOrderItem);
	}
	public void updateOrderItem(int ID,int num)
	{
		for (int i = 0; i < list.size(); i++) {
			OrderItem temp=list.get(i);
			if(temp.getItemID()==ID)
			{
				if(num>0)
				{
					temp.setNum(num);
				}
				else
				{
					list.remove(temp);
				}
				return;
			}
		}
		OrderItem newOrderItem=new OrderItem(Catalog.getItem(ID),num);
		list.add(newOrderItem);
	}
	
	public double getTotalCost()
	{
		double sum=0;
		for (int i = 0; i < list.size(); i++) {
			OrderItem temp=list.get(i);
			sum+=temp.getTotalCost();
		}
		return sum;
	}
}