Making a String from KeyTyped in Java

I must make a nickname, and I do everything, using KeyListener. I want to write nickname using keyTyped, but I have no idea, how to save each letter. For exaple:

keyTyped(KeyEvent e){           
        char key = e.getKeyChar();
        nick = new String[10];
        for(int i = 0; i<10; i++){
            nick[i] = Character.toString(key);
            key = e.getKeyChar();
        }
 }

Unfortunately, every letter is the last one typed. How to do it?