Problem adding columns and rows in JTable

Question

hi, hope somebody can help me
i have some problems when i add columns and later i try to set number of rows in JTable, ocurr some exceptions
my code is something like thisJTable tabla = new JTable();
TableColumn tc = new TableColumn();
tc.setHeaderValue("col1");
tc.setPreferredWidth(20);
tabla.getColumnModel().addColumn(tc);up to here everything goes well, my table shows the column, but when i add this line((DefaultTableModel)tabla.getModel()).setNumRows(1);ocurrs the next exception
Exception occurred during event dispatching:
java.lang.ArrayIndexOutOfBoundsException: 0 >= 0....
any ideas????

Answer 1

oks, that would work when the JTable is created, but now we say that I require a method which adds a new row to the JTable a some moment of execution
Look some of my code
i have this in a JFrame...
JTable tabla = new JTable();
DefaultTableModel tm = new DefaultTableModel();
tabla.setModel(tm);
agrCol("Col1", 80);
agrCol("Col2", 160);
agrFil();
agrFil();
agrCol(String col, int lon) {
  tm.addColumn(col);
  tabla.getColumn(col).setPreferedWith(lon);
agrFil() {
  tm.setRowCount(tabla.getRowCount() + 1);
the jtable shows the 2 columns and 2 rows, but the setPreferedWith work only in the last col, i'm confused