Question

In my UI I am using a JTable with a TableModel.In a update method of the implemented Observer interface i am calling the repaint method.The delete operations take place immediately while on adding a row it is not updated,but it is updated while switching through tabs( which calls another method instead of repaint)

This is code for update method:

 public void update(Observable o, Object arg) {
        ((MyTableModel)table_.getModel()).addTableRow(row);

    //addTable(row) adds the  row to the dataVector that populates the JTable
    //the dataVector is updated with added row

            table_.repaint();

            }

I wanted to know why the JTable is not getting updated
Please Note->the data Vector has the required rows including the added row

Answer 1

Your addTableRow method should also fire an event indicating the row has been added to alert the JTable of this change. Then there is no need for the repaint call.

Take for example a look at the implementation of the addRow method of the DefaultTableModel:

public void insertRow(int row, Vector rowData) {
    dataVector.insertElementAt(rowData, row);
    justifyRows(row, row+1);
    fireTableRowsInserted(row, row);
}

You can clearly see that an event is fired, and no repaint needed. This is all explained in more detail in the JTable tutorial