public Class getColumnClass(int c) {
try {
Class cl = lookup.get(0, c).getClass();
for (int i = 0; i < getRowCount(); i++) {
if (!cl.equals(lookup.get(i, c).getClass())) return Object.class;
}
return cl;
} catch (NullPointerException e) {
return Object.class;
}
}
public Object getValueAt(int row, int column) {
return lookup.get(row, column);
}