设计一个保存和管理电话号码的具有图形用户界面的应用程序，保存若干人的电话号码到文件中，系统应实现插入、修改、删除、查询等功能。 -Design a phone number conservation and management application with a graphical user interface, to save several people s phone number to a file, the system should insert, modify, delet