How can I know when the text of an editable JComboBox has been changed?

Question

I have an editable JComboBox where I want to take some action whenever the text is changed, either by typing or selection. In this case, the text is a pattern and

Answer 1

You can use somthing like this:

JComboBox cbListText = new JComboBox();
cbListText.addItem("1");
cbListText.addItem("2");
cbListText.setEditable(true);
final JTextField tfListText = (JTextField) cbListText.getEditor().getEditorComponent();
tfListText.addCaretListener(new CaretListener() {
    private String lastText;

    @Override
    public void caretUpdate(CaretEvent e) {
        String text = tfListText.getText();
        if (!text.equals(lastText)) {
            lastText = text;
            // HERE YOU CAN WRITE YOUR CODE
        }
    }
});