swing 关闭窗口

myFrame extends JFrame?? 3种：

?

1、this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

?

2、重写JFrame的processWindowEvent方法：

protected void processWindowEvent(WindowEvent e) {
???? if (e.getID() == WindowEvent.WINDOW_CLOSING) {
?????? System.exit(0);
???? }
?}

?

3、

this.addWindowListener(new WindowAdapter(){
?????public void windowClosing(WindowEvent e) {
?????????System.exit(0);
?????}
});