}
return sname;
public void setSname(String sname) { }
public String getPhonumber() { }
public void setPhonumber(String phonumber) { }
public String getSex() { }
public void setSex(String sex) { }
public String getDept() { }
public void setDept(String dept) { }
public Information(int snum, String sname, String phonumber, String sex,String dept) {
super();
this.snum = snum; this.sname = sname;
this.phonumber = phonumber; this.sex = sex; this.dept = dept; }
}
this.dept = dept; return dept; this.sex = sex; return sex;
this.phonumber = phonumber; return phonumber; this.sname = sname;
4.ui包中的类：
（1） LoginUI类：此类为登陆界面，在这个界面上，设置有两
个按钮，学生按钮，教师按钮。给这两个按钮注册事件addActionListener，分别在内部类TeacherLoginActionListene和StudentLoginActionListener中的默认方法actionPerformed（）中创建TeacherLoginUI类和StudentLoginUI类的对象，即打开教师登陆界面和学生登录界面，并将原登陆界面关闭。 LoginUI类源代码：
package ui; import java.awt.*; import java.awt.event.*; import javax.swing.*;
public class LoginUI extends JFrame {
JLabel l1;
JButton bt1, bt2; Container cp; public LoginUI() {
l1 = new JLabel(\请选择用户类型\); bt1 = new JButton(\教师\); bt2 = new JButton(\学生\); JPanel p1 = new JPanel(); p1.setLayout(null);
l1.setBounds(150, 150, 120, 40); p1.add(l1);
bt1.setBounds(120, 230, 80, 30); p1.add(bt1);
bt2.setBounds(220, 230, 80, 30); p1.add(bt2);
bt1.addActionListener(new
TeacherLoginActionListener());//注册事件 bt2.addActionListener(new StudentLoginActionListener());//注册事件 cp = getContentPane();
this.setBounds(200, 200, p1.getHeight(), cp.add(p1);
this.setTitle(\用户登录界面\); this.setSize(400, 400); this.setVisible(true);
p1.getHeight());
}
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) { }
System.exit(0);
});
class TeacherLoginActionListener implements }
public void actionPerformed(ActionEvent e){ }
new TeacherLoginUI(); dispose();
ActionListener{
class StudentLoginActionListener implements ActionListener{
public void actionPerformed(ActionEvent e){ }
}
public static void main(String[] args) { } }
new LoginUI();
new StudentLoginUI(); dispose();
执行截图如下：
（2）StudentLoginUI类：此类为学生登陆界面，在这个界面
上有两个文本框，分别输入学生姓名和登录密码，还有四个按钮，查询、注册、修改和退出。输入后，从两个文本框中获取用户输入的内容，点击“查询”按钮时，调用StudentDao类中的student（）方法验证是否存在该用户。若存在，则创建StudentInformationUI类的对象，即打开学生信息界面，显示此登陆学生的信息，若不存在，则提示密码错误。单击“注册”按钮，调用StudentDao类中的student（）方法验证是否存在该用户。若存在，则创建ZhuceStudentUI类的对象,即打开学生注册界面。单击“修改”按钮，调用StudentDao类中的student（）方法验证是否存在该用户。若存在，则创建xiugaiStudentUI类的对象，即打开修改学生密码界面。
StudentLoginUI类源代码：
package ui;
import java.awt.*; import java.awt.event.*; import javax.swing.*; import Dao.StudentDao;
public class StudentLoginUI extends JFrame{
JLabel l1, l2; JTextField t1; JPasswordField t2; JButton bt1, bt2; Container cp;
public static String st1; public String st2; public StudentLoginUI(){
l1 = new JLabel(\学生姓名\); l2 = new JLabel(\密码\); t1 = new JTextField(12); t2 = new JPasswordField(12); bt1 = new JButton(\查询\); bt2 = new JButton(\退出\);
JPanel p1 = new JPanel(); p1.setLayout(null);
l1.setBounds(150, 150, 80, 40);
p1.add(l1);
t1.setBounds(250, 150, 80, 30); p1.add(t1);
l2.setBounds(150, 190, 80, 40); p1.add(l2);
t2.setBounds(250, 190, 80, 30); p1.add(t2);
bt1.setBounds(150, 280,70, 30); p1.add(bt1);
bt2.setBounds(240, 280, 70, 30); p1.add(bt2);
bt1.addActionListener(new
LoginActionListener());//注册事件 bt2.addActionListener(new
bt2.addActionListener(new
ExitActionListener());//注册事件 cp = getContentPane();
}
class LoginActionListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
st1 = t1.getText(); st2 = t2.getText(); StudentDao oneStudentDao = new StudentDao(); boolean isSuccess = oneStudentDao.student(st1, this.setBounds(200, 200, p1.getHeight(), cp.add(p1);
this.setTitle(\学生登录界面\); this.setSize(450, 450); this.setVisible(true);
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) { }
System.exit(0);
p1.getHeight());
});