基于Swing编写一个用户登录的界面程序，用户类型分为学生用户和教师用户，如下图所示。如果用户输入为空，则给出“用户名不可为空”的提示信息，若是教师用户，输入的用户名和密码都是teacher，则显示“教师用户登录成功”的提示信息；若是学生用户，输入的用户名和密码都是student，则显示“学生用户登录成功”的提示信息；否则显示“用户名不存在或者密码不正确”。-A user login interface program written in Swing-based user types into the student users and teachers to users, as shown below. If the user input is empty, the user name is not empty "message is given, the teacher user, enter the user name and password are teacher, shows teachers　user login success" message　student user input the user name and password are the student shows the student user login successful "message　otherwise display the user name does not exist or password is incorrect."