如何在java中删除以前的Timer?

时间:2012-05-21 16:04:05

标签: java timer

我已经实现了一个计时器来调用我的alert()方法。从数据库中检索计时器的持续时间。当我将持续时间设置为1分钟时,计时器每隔一分钟调用alert()。当我再次设置持续时间5分钟时,1分钟计时器不会停止。所以现在我有2个运行计时器。如何删除以前的计时器?感谢。

private void getDuration() 
{       
    durationTimer = new javax.swing.Timer(durationDB, new ActionListener() 
    {               
        public void actionPerformed(ActionEvent e) 
        {       
            alert();      
        }     
    });                 
    durationTimer.stop();

    try
    {   
        // Connection to the database
        Class.forName("com.mysql.jdbc.Driver");
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/smas","root","root");
        Statement stmt = con.createStatement();
        ResultSet rs = stmt.executeQuery("SELECT * FROM alertduration");    

        while (rs.next()) 
        {
            durationDB = rs.getInt("duration");     
        }   

        con.close();            
    }

    catch(Exception ea)
    {
        JOptionPane.showMessageDialog(watchlist, "Please ensure Internet Connectivity ", "Error!", JOptionPane.ERROR_MESSAGE);
    }           


    durationTimer = new javax.swing.Timer(durationDB, new ActionListener() 
    {               
        public void actionPerformed(ActionEvent e) 
        {       
            alert();      
        }     
    });         

    durationTimer.start();

1 个答案:

答案 0 :(得分:2)

完成第一个计时器后,调用stop()方法。也许值得让你的计时器全局并重新使用它,而不是每次持续时间改变时创建一个新计时器。请参阅:http://docs.oracle.com/javase/6/docs/api/javax/swing/Timer.html

示例:

durationTimer = new javax.swing.Timer(duration, new ActionListener() {               
    @Override
    public void actionPerformed(ActionEvent e) {       
        alert();
    }     
});                 

durationTimer.start();

//wait for duration to change
durationTimer.stop();
durationTimer.setDelay(duration);
durationTimer.start();