TimerTask vs计时器vs线程? [英] TimerTask vs Timer vs Thread?

问题描述

我试图在JLabel上连续显示日期和时间.因此，在我观看的上一教程中，发言人说:您必须在必要时使用此线程，因为它会占用程序的内存."

I'm trying to show Date and time continuously on a JLabel. So on the last tutorial I've watched.the speaker said "You must Use this threads whenever necessary because it takes memory in your program".

所以我搜索了其他替代方法，然后找到了Timer和TimerTask，这是在程序的长期运行中最有效的方法?

So I search other alternatives and i find Timer and TimerTask which is the most efficient way to use on the long run of the program?

推荐答案

计时器用于在一定间隔，延迟或两者结合之后运行任务(即TimerTask).在您的情况下，您可以使用以下方式:

A Timer is used to run a task (i.e: TimerTask) on an interval, after a delay, or a combination of the two. In your case, you can use something like this:

   java.util.Timer timer = new java.util.Timer();
    timer.schedule(new TimerTask() {
        public void run() {
//            do task
        }
    }, 0, 1000);  //updates every second

请注意，为了更新Swing线程以外的其他线程中的Swing组件，您需要使用SwingWorker(请参见

Note that in order to update a Swing component in a thread other than the Swing thread, you'll need to use a SwingWorker (see Swing Concurrency Tutorial), or user a Swing Timer instead. The code below is using a Swing timer to update the label with a new date every second:

javax.swing.Timer timer1 = new javax.swing.Timer(0, new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {
            label.setText(new Date());
        }
    });

    timer1.setRepeats(true);
    timer1.setDelay(1000);

我尚未对此进行测试，因此您可能需要对其进行一些微调才能为您工作.

I haven't tested this, so you may need to tweak it a little to work for you.

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