Question

I have a list of checkboxes, but I can not make multi selection from this list, it disables the previous selection when I check a new box. how can I change my code? or if it looks ok and by accident I do something wrong somewhere else in my code.

public JPanel createMultiMenu(ArrayList<String> domainItems) {

    checkBoxMenuPanel = new JPanel();
    checkBoxMenuPanel.setLayout(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.gridx = 0;
    gbc.gridy = GridBagConstraints.RELATIVE;
    gbc.anchor = GridBagConstraints.WEST;

    ButtonGroup group = new ButtonGroup();
    for (String item : domainItems) {
        JCheckBox checkBox = new JCheckBox(item);
        group.add(checkBox);
        checkBoxMenuPanel.add(checkBox,gbc);        
    }
    return checkBoxMenuPanel;
}

Answer 1

The problem is that you are using ButtonGroup, which treats objects placed in it as radiobuttons (you can only select one at a time).

Instead try just adding them to the JPanel.

public JPanel createMultiMenu(ArrayList<String> domainItems) {

    checkBoxMenuPanel = new JPanel();
    checkBoxMenuPanel.setLayout(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.gridx = 0;
    gbc.gridy = GridBagConstraints.RELATIVE;
    gbc.anchor = GridBagConstraints.WEST;


    for (String item : domainItems) {
        JCheckBox checkBox = new JCheckBox(item);
        checkBoxMenuPanel.add(checkBox, gbc);        
    }
    return checkBoxMenuPanel;
}

Something like that.