一个保存和管理电话薄的图形用户界面，显示若干朋友的电话号码，提供添加、删除和查找等功能，并将各数据项按指定树形关系分类排列显示，将该树形关系保存在指定文件中。-A phone book to store and manage graphical user interface, display some friend s phone number, provide Add, delete, and search functions, and the relationship between data items specified category tree display order, the relationship between tree saved in the specified file in.

件中。