How to clear contents of a jTable ?

I have a jTable and it's got a table model defined like this:

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javax.swing.table.TableModel dataModel = 
     new javax.swing.table.DefaultTableModel(data, columns);
tblCompounds.setModel(dataModel);

Does anyone know how I can clear its contents ? Just so it returns to an empty table ?

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Easiest way:

//private TableModel dataModel;
private DefaultTableModel dataModel;


void setModel() {
  Vector data = makeData();
  Vector columns = makeColumns();
  dataModel = new DefaultTableModel(data, columns);
  table.setModel(dataModel);
}

void reset() {
  dataModel.setRowCount(0);
}

i.e. your reset method tell the model to have 0 rows of data The model will fire the appropriate data change events to the table which will rebuild itself.

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If you mean to remove the content but its cells remain intact, then:

public static void clearTable(final JTable table) {
   for (int i = 0; i < table.getRowCount(); i++) {
      for(int j = 0; j < table.getColumnCount(); j++) {
          table.setValueAt("", i, j);
      }
   }
}

OK, if you mean to remove all the cells but maintain its headers:

public static void deleteAllRows(final DefaultTableModel model) {
    for( int i = model.getRowCount() - 1; i >= 0; i-- ) {
        model.removeRow(i);
    }
}

---

    //To clear the Contents of Java JTable

    DefaultTableModel dm = (DefaultTableModel) JTable1.getModel();

    for (int i = 0; i < dm.getRowCount(); i++) {
        for (int j = 0; j < dm.getColumnCount(); j++) {
            dm.setValueAt("", i, j);
        }
    }

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You have a couple of options:

1. Create a new DefaultTableModel(), but remember to re-attach any listeners.
2. Iterate over the model.removeRow(index) to remove.
3. Define your own model that wraps a List/Set and expose the clear method.

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I think you meant that you want to clear all the cells in the jTable and make it just like a new blank jTable. For an example, if your table contains 40 raws, you can do following.

DefaultTableModel model = (DefaultTableModel)this.jTable.getModel();
model.setRowCount(0);
model.setRowCount(40);

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One of the trivial methods is to use the following option.

dataModel.setRowCount(0);

dataModel is the model which you would like clear the content on

However, it is not optiomal solution.

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Another easy answer:

defaultTableModel.getDataVector().removeAllElements();