Changing a JButton text when clicked

Question

I have created a class which extends JDialog, where I have some checkboxes and 3 buttons: accept, cancel, and select all.

When user clicks select all, every checkbox

Answer 1

The button does not disappear, it just becomes too wide to fit in the window. Just redraw the component when changing the button label :

@Override
public void actionPerformed(ActionEvent e) {
    if(allCheckBoxesSelected){
        allCheckBoxesSelected = false;
        allButton.setText("Select all");
    } else {
        allCheckBoxesSelected = true;
        allButton.setText("Unselect all");
        NodeSelectionCheckBoxJDialog.this.pack();
    }
}