6-3 接口与回调

import javax.swing.Timer;

public class TimerTest {
    public static void main(String[] args) {
        //TimerTest timertest = new TimerTest();
        TimePrinter listener = new TimePrinter();
        Timer t = new Timer(10000, listener); //定时器，10000毫秒+监听器
        t.start();
        javax.swing.JOptionPane.showMessageDialog(null, "退出程序?");//GUI界面
        System.exit(0);
    }
}

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;
import java.awt.Toolkit;

public class TimePrinter implements ActionListener {

    public void actionPerformed(ActionEvent e) {
        Date now = new Date();
        System.out.println("at the tone,the time is" + now);
        Toolkit.getDefaultToolkit().beep();//提示音
    }

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