JTable problem

[Jude Fawly]

hi,

when i use the DefaultTableModel like this:
DefaultTableModel df = new DefaultTableModel()
i can add rows and columns to the table using addColumn and addRows method.
But when i use this class to load my JTable with data from the database, i can not
add rows and columns.
How can i add rows to the JTable when i use my own class that extends DefaultTableModel to load the JTable with
data from the database!

thanks.

[Craig Wood]

import java.util.Vector;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
 
public class ExtendedModelTest
{
    public static void main(String[] args)
    {
        Object[] colNames = { "column 1", "column 2", "column 3" };
        int rows = 3, cols = 3;
        Object[][] data = new Object[rows][cols];
        for(int row = 0; row < rows; row++)
            for(int col = 0; col < cols; col++)
                data[row][col] = "" + row + col;
        JTable table = new JTable(new CustomModel(data, colNames));
        showData(table);
 
        // add a row
        int rowIndex = table.getRowCount();
        Object[] newRow = new Object[cols];
        for(int col = 0; col < cols; col++)
            newRow[col] = "" + rowIndex + col;
        ((DefaultTableModel)table.getModel()).addRow(newRow);
        showData(table);
 
        // add a column
        int colIndex = table.getColumnCount();
        Object columnName = "column " + colIndex+1;
        Object[] columnData = new Object[table.getRowCount()];
        for(int row = 0; row < table.getRowCount(); row++)
            columnData[row] = "" + row + colIndex;
        ((DefaultTableModel)table.getModel()).addColumn(columnName, columnData);
        showData(table);
    }
 
    private static void showData(JTable table)
    {
        Vector v = ((DefaultTableModel)table.getModel()).getDataVector();
        for(int j = 0; j < v.size(); j++)
            System.out.println(v.get(j));
        System.out.println();
    }
 
    private static class CustomModel extends DefaultTableModel
    {
        public CustomModel(Object[][] rowData, Object[] columnNames)
        {
            super(rowData, columnNames);
        }
    }
}