class CommandListener implements KeyListener{
        public void keyPressed(KeyEvent ke){
            String lastCommand = "";
            if (ke.getKeyCode() == KeyEvent.VK_ENTER){
                command = ta.getText();
 
                command = command.trim();
                lastCommand = command.substring(command.lastIndexOf("\n") + 1);
                answer = Answers.qetAnswer(lastCommand);
                ta.append("\n" + answer);
              }
            if (lastCommand.equals("\"Goodbye\"")){
                System.exit(0);
            }
        }
        public void keyReleased(KeyEvent ke){}
        public void keyTyped(KeyEvent ke){}
    }