codice:
this.textMsg.addKeyListener(new KeyListener(){


                @Override
                public void keyTyped(KeyEvent e) {
                    e.consume();
                    if(e.getKeyCode()==KeyEvent.VK_ENTER){
                        listener.actionPerformed(null);
                    }
                }


                @Override
                public void keyPressed(KeyEvent e) {
                }


                @Override
                public void keyReleased(KeyEvent e) {
                }
               
           });