构造一颗机构树根据用户权限返回这个树,用于java中根据用户权限返回不同的树菜单-tree structure a body of users to return to the tree authority for java based user privileges to different menu tree

一个模仿QQ的登录界面，能帮助刚学习JAVA的同学更好地设计JAVA程序。-A copy of the QQ login screen

使用java实现菜单，按钮等典型用户界面实现-Use java to achieve menus, buttons and other typical user interface