用java实现的一个简单的定时报警程序

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package com.eric.interfaceAndInnerClass;
 
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;
 
import javax.swing.JOptionPane;
import javax.swing.Timer;
 
public class TimerTest implements ActionListener {
 
    public void actionPerformed(ActionEvent e) {
        Date d=new Date();
        System.out.println("the time is:"+d);
        Toolkit.getDefaultToolkit().beep();
    }
    public static void main(String[] args) {
        ActionListener al=new TimerTest();
        Timer t=new Timer(1000,al);
        t.start();
        System.out.println("stop timer!!!1");
        
        JOptionPane.showMessageDialog(null,"exit sysytem");
        System.exit(0);
    }
 
}