http://www.verejava.com/?id=17159702655333

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

public class Test1 {
    
    private Timer timer;

    public Test1() {
        timer = new Timer();
        //每隔 1 秒 显示当前时间
        timer.schedule(new MyTask(), new Date(), 1000);
    }

    class MyTask extends TimerTask {

        @Override
        public void run() {
            //打印当前时间
            SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            System.out.println(df.format(new Date()));
        }

    }

    public static void main(String[] args) {
        new Test1();
    }
}

http://www.verejava.com/?id=17159702655333