title: How to get JTextField name in which is Document placed?
body: <p>Is there something like event.getSource for DocumentListener too? 
  Im trying to change color of just one JTextField in which is text changing.
  Here is my DocumentListener:</p>
  
  <pre><code>DocumentListener posluchac = new DocumentListener() {
          public void changedUpdate(DocumentEvent e) {
              warn(e);
          }
          public void removeUpdate(DocumentEvent e) {
              warn(e);
          }
          public void insertUpdate(DocumentEvent e) {
              warn(e);
          }
          public void warn(DocumentEvent e) {
              txtName.setBackground(Color.WHITE);
              txtSurname.setBackground(Color.WHITE);
              txtPersonalNumber.setBackground(Color.WHITE);
              txtDateOfBirth.setBackground(Color.WHITE);
          }
      };
  </code></pre>
  
  <p>If there is nothing like <code>.getSource()</code> for DocumentListener. How to do it?</p>