Delete a character at a time from a textarea

Question

I am designing a mobile phone simulation, where the user creates a message from a keypad, to the text area, there is a back button that does two things:
1. Deletes a character at a time
2. Moves back through text
How do i delete a character at a time //
I thought about doing a count of the text in the text area then use delteCharAt() and give the position as count, but it requires the variable to be a StringBuffer and mytextarea variable is of type string, this is what i have done but it does not work any suggestions please.
int count = 0;
System.out.println("pressed BCK");
txtmsg = (display.getText());
count = txtmsg.length();
System.out.println(count);
          if (e.getSource()==keys[9])
               System.out.println("pressed BCK twice - DELETE");
               txtmsg.deleteCharAt(count);
               display.setText(display.getText());
          }Thank You

Answer 1

When i do this i get the following error, cannot find symbol method deleteCharAt().
Txtmsg is of type string, don't know if this matters.