如何在JLabel上放置一个计时器来每秒更新一次 [英] how to put a timer on a JLabel to update itself every second

问题描述

我创建了一个游戏，在我的swing GUI界面中，我想放一个计时器。我这样做的方式是有一个当前时间的字段，得到 System.currentTimeMillis（），它在游戏开始时得到它的值。我的游戏我把 System.currentTimeMillis（） - 字段;并告诉你自游戏开始以来的当前时间。

I created a game and in my swing GUI interface i want to put a timer . The way i do this at the moment is have a field with the current time , gotten with System.currentTimeMillis() which gets it's value when the game starts .In the method of my game i put the System.currentTimeMillis()- field; and it tells you the current time passed since the game started.

然而，如何让它每秒更新一次让我们说，所以 JLabel 将有：timePassed： 0s，timePassed：1s等等。请记住，我在任何时候都不会在游戏中使用线程。

Nevertheless, how do get this to update itself every second lets say, so the JLabel will have : timePassed: 0s , timePassed: 1s and so on. Have in mind that i don't use threads in my game at any point.

编辑：谢谢大家的善意建议。我使用了你的答案的组合，请给我一些反馈。

thank you all for your kind suggestions. I used a combination of your answers please give me some feedback.

我将jlabel称为时间字段。 （否则我无法处理它）。

I have the jlabel as a field called time. (else i cant handle it).

time = new JLabel("Time Passed:  " + timePassed() + " sec");
    panel_4.add(time);

    ActionListener actionListener = new ActionListener() {
        public void actionPerformed(ActionEvent actionEvent) {
            time.setText("Time Passed: " + timePassed() + " sec");
        }
    };
    Timer timer = new Timer(1000, actionListener);
    timer.start();

推荐答案

看一下 swing timer class 。它允许很容易地设置重复任务。

Have a look at the swing timer class. It allows to setup recurring tasks quite easily.

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