java 如何倒计时并展现

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

2、super("10秒计数器");button=new JButton();panel=new JPanel();add(panel);panel.add(button);

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

4、class ButtonAction extends Thread{int i=10;public void run() //线程在此开始执行{while(i!=0){try{

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

6、if(i==0){JOptionPane.showMessageDialog(null, " 时间到！"); }} }public static void main(String args[]){JFrame frm = new Test();frm.dispose();System.exit(0);}}