* 程序名称：食品价格计算

* 程序说明：

* 1. 将所购食品分为主食，水果和饮料三组，在左面板目显示。

* 2. 点击任何一个组名，右面板目显示其组内所包括的具体食物。

* 3. 通过使用Builder方法,来控制对不同组食物，右面板的不同显示方式。

* 4. 在底部面板显示各组内食品的总价格。

* 5. 若选择中右面板中的特定食品，只显示所选中条目所代表的价格。

* 6. 若选择中右面板中的全部食品，则其个底部面板上的总价格相等。-procedures * Name : food prices procedures * Note : * 1. Will be divided into purchase food staples, three fruits and beverages group, head of the left panel shows. * 2. Click on the name of any one group, and the right panel shows its head within the group, including the specific food. * 3. Builder through the use of methods to control the different food groups, and the right panel shows the different ways. * 4. In the bottom panel shows the group within the overall food prices. * 5. If they choose, right panel of specific foods, which only shows that the selected entries represent prices. * 6. If they choose, right panel of all the food, then a bottom panel equal to the total price.