How to use Backspace to remove a character from a String.

[mike200015]

I have a text area with a document listener (below). When a user types into it, the input is saved into the string userInput, and the text is then removed from the text area so it is not displayed (using invokeLater). I need the Backspace key to do what it is supposed to do, remove the last character from the userInput string, but I don't know how to do that.

Please help,
Thanks

code:

typedArea.getDocument().addDocumentListener(new DocumentListener() {       Document doc = (Document)typedArea.getDocument();       public void insertUpdate(DocumentEvent e) {         try {           userInput += typedArea.getText(doc.getLength()-1, 1);           System.out.println(userInput);           Runnable clearText = new Runnable() {             public void run() {               typedArea.setText("");             }           };           SwingUtilities.invokeLater(clearText);         }         catch(Exception ex) {         }         }       public void removeUpdate(DocumentEvent e) {       }       public void changedUpdate(DocumentEvent e) {       }          });   }