Question

I have a JTable which uses a custom TableModel to display a series of object instances. There’s a switch case inside getValueAt(int row, int column) to return values according to given attributes (see below). One return statement involves returning a value of 1/0 as true/false.

Is there a way that I can modify this TableModel so that it displays a 1/0 when a cell is edited?

public Object getValueAt(int row, int column) {
    User user = (User)dataVector.get(row);
    switch (column) {
        case ID_INDEX:
           return user.getId();
        case USERNAME_INDEX:
           return user.getUserName();
        case PASSWORD_INDEX:
            return "****";
        case ACTIVATED_INDEX:
            return (user.getActivated())?"true":"false";
        default:
           return new Object();
    }
}

Answer 1

The default renderer and editor for Boolean is a JCheckBox. Consider using

case ACTIVATED_INDEX:
    return Boolean.valueOf(user.getActivated());

Alternatively,

case ACTIVATED_INDEX:
    return (user.getActivated())?"1":"0";

Addendum: As an example, DefaultTableModel does not override getColumnClass(), and AbstractTableModel simply returns Object.class. Your TableModel should override getColumnClass() accordingly:

DefaultTableModel dtm = new DefaultTableModel() {

    @Override
    public Class<?> getColumnClass(int col) {
        return getValueAt(0, col).getClass();
    }
};
// add some data
JTable table = new JTable(dtm);