说明：  * 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.)