购物系统，列表列出商店中的所有商品、数量级价格，系统对客户的每次购物情况进行记录，年中进行统计可户的消费情况-Shopping system, list all the goods listed in the store, the price of magnitude, the system for each customer' s shopping record of the situation in mid-year statistics available household con

JBOX2D 是一款很好的JAVA 物理引擎。用于解决java 使用物理引擎的问题。-JBox2D is a close Java port of Erin Catto s excellent C++ Box2D physics engine. Check out the demos to see what it can do.This project has been led by dmurphy (toucansam in the forums) since mid 2010. It was