JTableの項目を更新する

Question

私はJTableにadd関数を実装しましたが、更新を呼び出すときにフィールドが空になるため、更新が困難です。選択したテーブル項目をどのように参照し、その列からデータを引き出すのですか。私が正しく

1見ればここで

public class GUIMemos { 
Calendar calendar = Calendar.getInstance(); 
Date timeStamp = new java.sql.Timestamp(calendar.getTime().getTime()); 
private Frame frame = new Frame(); 
private DefaultTableModel tablemodel; 
private Memos memos = new Memos(); 
private AddDialog add_dialog = new AddDialog(frame, true); 



public GUIMemos()throws Exception{ 
} 
public void init() { 
final int WIDTH = 600, HEIGHT = 600; 
frame.setBounds(10, 10, WIDTH, HEIGHT); 
frame.setDivider((int) (HEIGHT * .4)); 
frame.setTitle("GUI Memos"); 

String[] column_names = {"id" , "timestamp" , "title",}; 
tablemodel = frame.setTableModel(column_names); 

double[] column_widths = {10, 50, 40}; // percentages adding to 100 
frame.setColumnWidths(column_widths); 

load_table(); 
frame.setVisible(true);    // invoke the frame 

frame.addListSelectionListener(new ListSelectionListener() { 
    @Override 
    @SuppressWarnings({"CallToThreadDumpStack"}) 
    public void valueChanged(ListSelectionEvent evt) { 
    if (evt.getValueIsAdjusting()) { 
     return; 
    } 
    int row = frame.getSelectedModelRow(); 
    int id = (Integer) tablemodel.getValueAt(row, 0); 

    try { 
     Memo memo = memos.fetch(id); 
     //frame.setContentText(memo.toString()); // doesn't matter either way 
    frame.setContentText(memo.getContent()); 
    } 
    catch (Exception e) { 
     e.printStackTrace(); 
     System.exit(1); 
    } 
    } 
    }); 

    add_dialog.setSize(500, 300); 

    frame.addMenuAddActionListener(new ActionListener() { 
    @Override 
    public void actionPerformed(ActionEvent evt) { 
    add_dialog.setTitle("Add Memo"); 
    add_dialog.setTitleText(""); 
    add_dialog.setContentText(""); 
    add_dialog.setVisible(true); 
    } 
    }); 


    add_dialog.addOKActionListener(new ActionListener() { 
    @Override 
    public void actionPerformed(ActionEvent evt) { 

    String title = add_dialog.getTitleText().trim(); 
    String content = add_dialog.getContentText(); 
    Timestamp timeStamp = new Timestamp(calendar.getTime().getTime()); 

    try { 
     if (title.isEmpty()) { 
     throw new Exception("cannot have empty title"); 
     } 
     Memo memo = new Memo(title, timeStamp, content); 
     int id = memos.insert(memo); 
     tablemodel.addRow(new Object[]{id, title, timeStamp}); 
     add_dialog.setVisible(false); 
    } 
    catch (Exception x) { 
     JOptionPane.showMessageDialog(frame, x.getMessage()); 
    } 
    } 
    }); 
frame.addMenuRemoveActionListener(new ActionListener(){ 
    @Override 
    public void actionPerformed(ActionEvent evt){ 

    } 
}); 
frame.addMenuUpdateActionListener(new ActionListener(){ 
    @Override 
    public void actionPerformed(ActionEvent evt){ 

     String title = add_dialog.getTitleText(); 
     String content = add_dialog.getContentText(); 
     add_dialog.setTitle("Add Memo"); 
     add_dialog.setTitleText(title); 
     add_dialog.setContentText(content); 
     add_dialog.setVisible(true); 
     } 

}); 

add_dialog.addCancelActionListener(new ActionListener() { 
    @Override 
    public void actionPerformed(ActionEvent evt) { 
    handle_add_cancel(); 
    } 
}); 

add_dialog.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE); 

add_dialog.addWindowListener(new WindowAdapter() { 
    @Override 
    public void windowClosing(WindowEvent evt) { 
    handle_add_cancel(); 
    } 
}); 

} 

@SuppressWarnings({"CallToThreadDumpStack"}) 
private void load_table() { 
    try { 
    for (Memo memo : memos.fetchAll()) { 
    tablemodel.addRow(new Object[]{ 
     memo.getId(), 
     memo.getTimeStamp(), 
     memo.getTitle(),}); 
    } 
} 
catch (Exception e) { 
    e.printStackTrace(); 
    System.exit(1); 
} 
} 

private void handle_add_cancel() { 
if (add_dialog.getTitleText().trim().equals("") 
    && add_dialog.getContentText().trim().equals("")) { 

    add_dialog.setVisible(false); // nothing of significance added 
} 
else {   // something is there: query the user 
    String message = "Do you want to exit\nwithout adding ?"; 

    int response = JOptionPane.showOptionDialog(
    frame, message, null, JOptionPane.YES_NO_OPTION, 
    JOptionPane.WARNING_MESSAGE, null, 
    new String[]{"yes", "no"}, "no" 
    ); 

    if (response == JOptionPane.YES_OPTION) { 
    add_dialog.setVisible(false); 
    } 
} 
} 

@SuppressWarnings("CallToThreadDumpStack") 
public static void main(String[] args) { 
try { 
    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
    new GUIMemos().init(); 
} 
catch (Exception e) { 
    e.printStackTrace(); 
} 
} 
} 

Answer 1

以下の私のコードは、あなたがJTable :-)

private Frame frame = new Frame(); 

、その後

tablemodel = frame.setTableModel(column_names); 
frame.setColumnWidths(column_widths); 

2）frame.setVisible(true);に対して定義し忘れた）でありますGUIを作成した後、最後のコード行でなければならない

本当に唯一 Twinkle Twinkle Little Star可能性は、あなたのクラスが

Memo memo = memos.fetch(id); 

4を返します。何を知っている

3））SwingWorker