How to handle cancel button in JOptionPane

Question

I had created a JOptionPane of type showInputDialog. When it opens it, it shows me two buttons: OK and Cancel. I would like to handle the action when I push on Cancel button, but I don't know how to reach it. How can I get it?

Answer 1

For example:

int n = JOptionPane.showConfirmDialog(
                            frame, "Would you like green eggs and ham?",
                            "An Inane Question",
                            JOptionPane.YES_NO_OPTION);
if (n == JOptionPane.YES_OPTION) {

} else if (n == JOptionPane.NO_OPTION) {

} else {

}

Alternatively with showOptionDialog:

Object[] options = {"Yes, please", "No way!"};
int n = JOptionPane.showOptionDialog(frame,
                "Would you like green eggs and ham?",
                "A Silly Question",
                JOptionPane.YES_NO_OPTION,
                JOptionPane.QUESTION_MESSAGE,
                null,
                options,
                options[0]);
if (n == JOptionPane.YES_OPTION) {

} else if (n == JOptionPane.NO_OPTION) {

} else {

}

See How to Make Dialogs for more details.

EDIT: showInputDialog

String response = JOptionPane.showInputDialog(owner, "Input:", "");
if ((response != null) && (response.length() > 0)) {

}

Answer 2

This is an old question, and I am an Java newbie so there might be better solutions, but I wanted to know the same, and maybe it can help others, what I did was to check if the response was null.

If the user clicks "cancel", the response will be null. If they click "ok" without entering any text the response will be the empty string.

This worked for me:

//inputdialog 
    JOptionPane inpOption = new JOptionPane();

    //Shows a inputdialog
    String strDialogResponse = inpOption.showInputDialog("Enter a number: "); 

    //if OK is pushed then (if not strDialogResponse is null)
    if (strDialogResponse != null){

        (Code to do something if the user push OK)  

    }
    //If cancel button is pressed
    else{

        (Code to do something if the user push Cancel)

    }