5.　　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。程序文件命名为Exe7_5.java。程序界面如下图所示：-5 students to design a registration interface. The input information includes the number ( 6 digits), name ( no more than 6 Chinese characters ), password (less than 6 characters, no more than 8 characters, and the need to enter 2, 2 input password must be identical ), professional ( from " Mathematics ", " computer " and "language " in the choice, we can input ), grades ( from " the first grade ", " the second grade ", " the third grade " and " the fourth grade " a choice, and can only choose one). Click the " register " button, check the input is correct, if the error will display the corresponding message, or pop up a message window, display all input registration information. Program file named Exe7_5.java. The program interface as shown below: