如何使單選按鈕更改表格數據

Question

我正在製作一個用於添加學生和教師數據的程序。我想，以示對學生或教師上表中的數據通過選擇單選按鈕

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){ 
    } 
    } 

我想打，如果我選擇單選按鈕表變化。我需要做一個按鈕？

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

Answer 1

我不知道一噸左右搖擺（上次使用它時，我在學校），但似乎你需要一個聽衆添加到您的單選按鈕。

這一概念在這裏解釋：http://www.java2s.com/Tutorial/Java/0240__Swing/ListeningtoJRadioButtonEventswithaChangeListener.htm

基本上你想創建一個變化監聽像這樣：

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

你會然後把你的改變監聽器，並把它添加到您的按鈕，像這樣的：

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

這應該可能工作。它看起來像不能直接添加一個監聽器到ButtonGroup而不是按鈕。那是我的第一個想法。你可以返回選擇的ButtonModel（如果我正在閱讀的話），但ButtonGroup沒有它自己的偵聽器概念。

在這裏看到：https://docs.oracle.com/javase/7/docs/api/javax/swing/ButtonGroup.html

我希望這有助於！

請讓我知道，如果我有什麼不對，因爲我已經觸摸任何鞦韆相關已經多年了！

Answer 2

您可以將ItemListener添加到單選按鈕。如果你只有兩個單選按鈕，然後避免任何Enumerator只需直接使用這樣的：

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). 
     } 

}