如何将JLabel文本更改为x秒 [英] How to change a JLabel text for x Seconds

问题描述

我想在短时间内更改JLabel文本(有一个计数器，如果有人在文本字段中输入错误的答案，我想显示一个错误的答案"而不是计数器.秒，我想再次显示计数器.)

I want to change the JLabel text for a short moment (there's a counter and if someone types in the wrong answer in a text field, I want to show a "wrong answer" instead of the counter. After a few seconds I want to show the counter again.)

推荐答案

对于 固定延迟执行 您要使用计时器对象的某些代码，在这种情况下，为

For the fixed-delay execution of some code you want to use a timer object, in this case javax.swing.Timer. Here is a demo that applies to your situation:

public static void main(String[] args) {
    SwingUtilities.invokeLater(()->{
        JFrame frame = new JFrame();
        frame.setLayout(new FlowLayout());
        JLabel label = new JLabel("One");
        JButton button = new JButton("Ok");
        button.addActionListener(e -> {
            String oldText = label.getText();
            label.setText("Changed");
            Timer timer = new Timer(2000, event -> {
                label.setText(oldText);
            });
            timer.setRepeats(false);
            timer.start();
        });
        frame.add(label);
        frame.add(button);
        frame.pack();
        frame.setVisible(true);
    });
}

按钮的侦听器更改标签的文本并启动Swing计时器(此处带有2秒的保险丝).一旦计时器超时，它将向其注册的侦听器其发送一个动作事件，在这种情况下，该事件会将文本还原为原始文本.

The listener for the button changes the text of the label and starts a Swing timer (here with a fuse of 2 seconds). Once the timer times out, it sends an action event to its (the timer's) registered listener, which in this case reverts the text to the original one.

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