图形编辑与计算管理程序:1）利用菜单选择不同功能；

2）可利用字符绘制三角形、矩形、圆形和梯形，具体尺寸和坐标可由用户输入；

3）可计算各图形的面积；

4）可统计各图形个数及图形总数；

5）要求用到多态和接口等知识点；

6）要求有异常处理机制。

-Graphics editor and computation management procedures: 1) using the menu to　different functions

2) available characters drawn triangle, rectangle, circle and trapezoid, the specific size and coordinates can be input by the user

3) can be calculated each graphic area

4) to statistics the number and the total number of graphics graphics

5) request use the knowledge such as polymorphism, and interfaces

6) requires the exception handling mechanism.