how to make radiobutton change the table data

Question

i am making a program for add student and teacher data. i want to show the data on the table for student or teacher by select the radio button

public void paneling(){
    panell = new JPanel(new BorderLayout());
    DefaultTableModel model = new DefaultTableModel();
        JTable table = new JTable(); //make the table
        table.setModel(model);
        table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
        table.setFillsViewportHeight(true);
        JScrollPane scroll = new JScrollPane(table);
        try{
            Class.forName("com.mysql.jdbc.Driver");
            Connection conn = DriverManager.getConnection(url, username, password);

        }catch(Exception e){
            JOptionPane.showMessageDialog(null, e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
        }
    panell.add(scroll,BorderLayout.CENTER);
    panel4 = new JPanel();
    panel4.setLayout(new FlowLayout());
    rb_siswa = new JRadioButton("Siswa");
    rb_dosen = new JRadioButton("Dosen");
    ButtonGroup bg = new ButtonGroup();
    bg.add(rb_siswa);
    bg.add(rb_dosen);
    rb_siswa.setSelected(true); //i set RadioButton siswa default
    panel4.add(rb_siswa);
    panel4.add(rb_dosen);
    panell.add(panel4,BorderLayout.NORTH);
    if(rb_siswa.isSelected()){ //the first if
        String[] columnNames= {"NIM", "ID_Jurusan", "ID_Kelas", "Name", "Tanggal_Lahir", "Gender", "Semester", "Alamat", "email", "nohp"};
        model.setColumnIdentifiers(columnNames);
        try{
        sql = "select * from siswa";
            PreparedStatement ps = conn.prepareStatement(sql);
            ResultSet rs = ps.executeQuery();
            while(rs.next()){
                NIM = rs.getString("NIM");
                IDJurusan = rs.getString("id_jurusan");
                IDKelas = rs.getString("id_kelas");
                Name = rs.getString("Nama");
                TL = rs.getString("TanggalLahir");
                gender = rs.getString("JenisKelamin");
                Semester = rs.getString("Semester");
                alamat = rs.getString("Alamat");
                email = rs.getString("e-mail");
                nohp = rs.getString("nohp");
                model.addRow(new Object[]{NIM, IDJurusan, IDKelas, Name, TL, gender, Semester, alamat, email, nohp});
            }
        }catch(Exception aae){
            JOptionPane.showMessageDialog(null, aae.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
        }
    }
    else if(rb_dosen.isSelected()){ // the second if
        String[] columnNames= {"ID_Dosen", "Name", "Gender", "Alamat", "email", "nohp"};
        model.setColumnIdentifiers(columnNames);
        try{
            sql = "select * from siswa";
            PreparedStatement ps = conn.prepareStatement(sql);
            ResultSet rs = ps.executeQuery();
            while(rs.next()){
                IDDosen = rs.getString("IDDosen");
                Name = rs.getString("Nama");
                gender = rs.getString("JenisKelamin");
                alamat = rs.getString("Alamat");
                email = rs.getString("email");
                nohp = rs.getString("nohp");
                model.addRow(new Object[]{IDDosen, Name, gender, alamat, email, nohp});
            }
        }catch(Exception aae){
    }
    }

i want to make if i select the radio button the table change. am i need to make a button ?

this is how the table looks like, hope can help you imagine

Answer 1

I don't know a ton about Swing (last used it when I was in school) but it seems that you need to add a listener to your radio buttons.

The concept is explained here: http://www.java2s.com/Tutorial/Java/0240__Swing/ListeningtoJRadioButtonEventswithaChangeListener.htm

Basically you would want to create a change listener like such:

ChangeListener changeListener = new ChangeListener() {
  public void stateChanged(ChangeEvent changEvent) {
    AbstractButton aButton = (AbstractButton)changEvent.getSource();
    ButtonModel aModel = aButton.getModel();
    // Code to change table here
  }
};

You would then take your change listener and add it to your buttons like such:

rb_siswa.addChangeListener(changeListener);
rb_dosen.addChangeListener(changeListener);

That should probably work. It looks like can't add a listener directly to the ButtonGroup and not the buttons. That was my first thought. You can return the ButtonModel of the selection (if I am reading that right) but the ButtonGroup does not have it's own listener concept.

See here: https://docs.oracle.com/javase/7/docs/api/javax/swing/ButtonGroup.html

I hope this helps!

Please let me know if I got anything wrong since it has been many years since I have touched anything swing related!

Answer 2

You can add ItemListener to radio buttons. If you have only two radio buttons then avoid any Enumerator just directly use something like this:

JRadioButton radio1 = new JRadioButton("Hello");
JRadioButton radio2 = new JRadioButton("World");

ButtonGroup btnGroup = new ButtonGroup();

// add listeners to button
radio1.addActionListener(this);
radio2.addActionListener(this);

// add buttons to button group
btnGroup.add(radio1);
btnGroup.add(radio2);

.
.
.
// and implement the itemStateChanged() method as follows:
public void itemStateChanged(ItemEvent e){

       if(radio1.isSelected())
       {
            // create the default table model and then populate it to jtable and put the jtable into scroll bar (for student)
       }
       else {
            // same as above (for teacher).
       }

}