CODEWITHSUNDEEP
javaswing
JenniferHL3
JenniferHL3

Reputation: 34

Have a Button Group in Java where all buttons can be deselected?

I want to have a Button Group in which either only one option is selected or none of them are. At the moment, I can get it to have no options ticked by default, and then if one of them is ticked only one of them can be ticked, but I also want to be able to untick the button that was selected. Is this possible?

EDIT: Ideally without having a clear all button, as it would ruin the symmetry of my GUI. Also, here is my code thus far:

ButtonGroup option = new ButtonGroup();
    for(int i = 0; i < n; i++) {
            JCheckBox check = new JCheckBox("", false);
            option.add(check);
            row3b.add(check);
        }

Upvotes: 0

Views: 1921

Answers (3)

Ahmed
Ahmed

Reputation: 1

I faced the same issue. ButtonGroup didn't work well, thus I had to code this behavior manually. I had two JCheckBoxs, A and B, they can't be selected both at the same time; only one selected at a time or none. I had to add actionListener to both JCheckBoxs, and had each JCheckBox to clear the selection the other JCheckBox.

Here is the code snippet :

JCheckBox A = new JCheckBox("A");
JCheckBox B = new JCheckBox("B");

A.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub
        if(A.isSelected()) {
            if(B.isSelected()) {
                B.setSelected(false);
            }
        }
    }
});
B.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub
        if(B.isSelected()) {
            if(A.isSelected()) {
                A.setSelected(false);
            }
        }
    }
});

Upvotes: 0

Steampunkery
Steampunkery

Reputation: 3874

This snippet demonstrates how you can clear selections using ButtonGroup.clearSelection():

    //The buttons
    JFrame frame = new JFrame("Button test");
    JPanel panel = new JPanel();
    JRadioButton btn1 = new JRadioButton("Button1");
    JRadioButton btn2 = new JRadioButton("Button2");
    JButton clearbutton = new JButton("Clear");

    panel.add(btn1);
    panel.add(btn2);
    panel.add(clearbutton);
    frame.add(panel);
    frame.setVisible(true);
    frame.pack();

    //The Group, make sure only one button is selected at a time in the group
    ButtonGroup btngroup = new ButtonGroup();
    btngroup.add(btn1);
    btngroup.add(btn2);

    btn1.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {

            // Do whatever you want here

        }
    });

    btn2.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {

            // Do whatever you want here

        }
    });

    clearbutton.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {

            // Clear all selections
            btngroup.clearSelection();

        }
    });

As you can see, this creates two JRadioButtons and adds them to group then makes a button that clears selections. Really simple. Or you could create your own radio button class that allows for the unchecking of the button, which is also doable relatively easily.

Upvotes: 0

Arnaud
Arnaud

Reputation: 17534

Just use the clearSelection() method of ButtonGroup :

ButtonGroup.clearSelection()

Clears the selection such that none of the buttons in the ButtonGroup are selected.

Upvotes: 3

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