设计一个学生注册界面。输入的信息包括学号（6位数字），姓名（不超过6个汉字），密码（不少于6个字符，不多于8个字符，且需要输入2次，2次输入的密码必须完全相同），专业（从“数学”、“计算机”和“外语”中选择，也可以自行输入），年级（从“一年级”、“二年级”、“三年级”和“四年级”中选择一项，且只能选择一项）。点击“注册”按钮后，程序检查输入是否正确，若错误则显示相应的提示信息，否则弹出一个消息窗口，显示所有输入的注册信息-design a student registration interface. The information entered, including Student ID (6 digits), name (not more than six characters), Password (at least 6 characters, no more than eight characters, and the need to enter 2 times, 2 times the password must be completely the same), professional (from the "Mathematics", "computer" and "foreign language" in the selection, you can also enter their own), grade (from "first grade", "second grade", "third grade" and "fourth grade" in the selection one, and only choose one). Click "Register" button, the program checks the input is correct, if the corresponding error message is displayed, or pop up a message window to display all the registration information input