Introduction - If you have any usage issues, please Google them yourself
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.