[英]JFrame based on selectedItem on JCombobox Java
我刚刚开始用Java开发,所以我有一个新手问题,我有一个Jcombobx,正在使用此函数从数据库中填充它:
private void fill(){
try{
con = DriverManager.getConnection("jdbc:....");
Statement pst = con.createStatement();
String sql = "select * from student";
ResultSet rs = pst.executeQuery(sql);
while(rs.next()){
jCombo.addItem(rs.getString("strudent_name");
}
} catch (Exception e){
System.out.println(e.getMessage);
}
代码正在运行并且从数据库中填充了组合,下一步是基于组合框中的selectedItem从数据库中填充另一个JFrame,当我在PHP中进行开发时,我知道这会更容易,因为我只需要将选择值中的id和显示的名称。 在android中,我可以通过Intent发送,但我不知道如何在jaa中进行操作,因为必须打开的下一个JFrame必须使用其他表中的信息来获取有关所选学生的详细信息。 感谢您的帮助。
首先为学生创建一个包装器类
public class Student
{
private int id;
private String name;
//more fields here like grades, subjects etc
public Student(int id, String name)
{
super();
this.id = id;
this.name = name;
}
public int getId()
{
return this.id;
}
public void setId(int id)
{
this.id = id;
}
public String getName()
{
return this.name;
}
public void setName(String name)
{
this.name = name;
}
@Override
public String toString()
{
return name;
}
}
然后像这样声明JComboBox
JComboBox<Student> jCombo = new JComboBox<>();
接着
private void fill(){
try{
con = DriverManager.getConnection("jdbc:....");
Statement pst = con.createStatement();
String sql = "select * from student";
ResultSet rs = pst.executeQuery(sql);
while(rs.next()){
Student student = new Student(rs.getInt("student_id") , rs.getString("student_name"));
jCombo.addItem(student);
} // while end
} catch (Exception e){
System.out.println(e.getMessage);
}
单击某些按钮后,您可以通过以下方式获取所选学生的ID
showDetailsButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0)
{
Student selectedStudent = (Student) jCombo.getSelectedItem();
new StudentDetails(selectedStudent.getId());
}
});
其中StudentDetails是另一个JFrame
class StudentDetails extends JFrame
{
public StudentDetails(int studentID)
{
// "Select * from student where student_id =" + studentID;
super();
add(new JLabel("Detail of student with id " + studentID + " goes here"));
setVisible(true);
setSize(100, 100);
}
}
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