Question

I implemented a Save As dialog in Java that prompts the user if the file already exists, and I want the No option to be selected by default. How do I do this?

Here is my current code:

JFileChooser chooser = new JFileChooser()
{
    public void approveSelection()
    {
        File selectedFile = getSelectedFile();
        if (selectedFile != null && selectedFile.exists( ) )
        {
            int response = JOptionPane.showConfirmDialog(
                    this,
                    "The file " + selectedFile.getName() + " already exists."
                        + " Do you want to replace the existing file?",
                    getDialogTitle(),
                    JOptionPane.YES_NO_OPTION,
                    JOptionPane.WARNING_MESSAGE);
            if (response != JOptionPane.YES_OPTION )
            {
                return;
            }
        }

        super.approveSelection();
    }
};

Answer 1

Use this constructor:

JOptionPane(Object message, int messageType, int optionType,
            Icon icon, Object[] options, Object initialValue)

where options specifies the buttons, and have initialValue (one of the options values) specify what the default is.

Update: You can call showOptionDialog rather than showConfirmDialog. The former takes options and initialValue parameters.