Swing 添加Esc快捷键退出程序

 JFrame demo = new JFrame();
 demo.addKeyListener(
     new KeyListener(){
             public void keyReleased(KeyEvent e) {
                  if (e.getKeyCode() == KeyEvent.VK_ESCAPE ) {
                                 UIHelper.closeWindow(demo);
                    }
             }
             public void keyTyped(KeyEvent e) {
             }
             public void keyPressed(KeyEvent e) {
             }
 });