java 如何倒计时并展现

1、import javax.swing.*;public class Test extends 夼猿勇麒JFrame { JButton button; JPanel panel; Test1DaoJiShi2() {

3、setSize(300,200);setVisible(true);ButtonAction tt=new ButtonAction();tt.run();}

5、sleep(1000); button.setText( "还有 " +i+ "秒 ");i--;}catch(Exception eee){}}