JTable How to refresh table model after insert delete or update the data

Question

This is my jTable   private JTable getJTable         String   colName      Name    Email    Contact No  1    Contact No  2                Group             if  jTable    null            jTable   new JTable                 public boolean isCellEditable int nRow  int nCol                    return false                                     DefaultTableModel contactTableModel    DefaultTableModel  jTable              getModel        contactTableModel setColumnIdentifiers colName       jTable setSelectionMode ListSelectionModel SINGLE SELECTION       return jTable      I will call this method to retrieve the data from database and put it into table model  public void setUpTableData         DefaultTableModel tableModel    DefaultTableModel  jTable getModel        ArrayList lt Contact gt  list   new ArrayList lt Contact gt         if   con equals              list   sql getContactListsByGroup con       else         list   sql getContactLists        for  int i   0  i  lt  list size    i              String   data   new String 7                data 0    list get i  getName                data 1    list get i  getEmail                data 2    list get i  getPhone1                data 3    list get i  getPhone2                data 4    list get i  getGroup                data 5    list get i  getId             tableModel addRow data             jTable setModel tableModel       Currently I was using this method to refresh the table after updating the table data  I will first clear the table   DefaultTableModel tableModel    DefaultTableModel  jTable getModel    tableModel setRowCount 0     and then restructure the table model again so it will refresh the jTable  But I was thinking is there any best practices or better way to do that

User · Accepted Answer

If you want to notify your JTable about changes of your data  use tableModel fireTableDataChanged    From the documentation      Notifies all listeners that all cell values in the table s rows may have changed  The number of rows may also have changed and the JTable should redraw the table from scratch  The structure of the table  as in the order of the columns  is assumed to be the same

User · Answer

I did it like this in my Jtable its autorefreshing after 300 ms   DefaultTableModel tableModel   new DefaultTableModel    public boolean isCellEditable int nRow  int nCol                    return false                   JTable table   new JTable     Timer t   new Timer 300  new ActionListener                   Override             public void actionPerformed ActionEvent e                    addColumns                    remakeData set                   table setModel model                                     t start     private void addColumns             model setColumnCount 0           model addColumn  NAME                model addColumn  EMAIL        private void remakeData CollectionType lt  Objects  gt  name        model setRowCount 0       for  CollectionType Objects   name       String n   Object getName        String e   Object getEmail        model insertRow model getRowCount   new Object     n e              I doubt it will do good with large number of objects like over 500  only other way is to implement TableModelListener in your class  but i did not understand how to use it well  look at http   download oracle com javase tutorial uiswing components table html modelchange

User · Answer

DefaultTableModel dm    DefaultTableModel table getModel    dm fireTableDataChanged       notifies the JTable that the model has changed

User · Answer

The faster way for your case is       jTable repaint       Repaint all the component  all Cells     The optimized way when one or few cell change         AbstractTableModel  jTable getModel    fireTableCellUpdated x  0      Repaint one cell

User · Answer

try this  public void setUpTableData         DefaultTableModel tableModel    DefaultTableModel  jTable getModel                   additional code              tableModel setRowCount 0                ArrayList lt Contact gt  list   new ArrayList lt Contact gt         if   con equals              list   sql getContactListsByGroup con       else         list   sql getContactLists        for  int i   0  i  lt  list size    i              String   data   new String 7            data 0    list get i  getName            data 1    list get i  getEmail            data 2    list get i  getPhone1            data 3    list get i  getPhone2            data 4    list get i  getGroup            data 5    list get i  getId             tableModel addRow data             jTable setModel tableModel                 additional code              tableModel fireTableDataChanged

User · Answer

Would it not be better to use java util Observable and java util Observer that will cause the table to update

[java] JTable How to refresh table model after insert delete or update the data.

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