Java Swing：延迟后更改文本 [英] Java Swing: Change Text after delay

问题描述

基本上，我有这个游戏，一旦猜到了正确的答案，它开始一个新单词的新游戏。我想显示正确！但三秒后，将其更改为空字符串。我该怎么做？

Basically, I have this game where once guesses the correct answer it starts a new game with a new word. I want to display Correct! but after three seconds, change it to a empty string. How do I do that?

我的尝试：

if (anagram.isCorrect(userInput.getText()))
    {

        anagram = new Anagram();
        answer.setText("CORRECT!");
        word.setText(anagram.getRandomScrambledWord());
        this.repaint();
        try
        {
        Thread.currentThread().sleep(3000);
        }
        catch (Exception e)
        {
        }
        answer.setText("");

    } else
    {
        answer.setForeground(Color.pink);
        answer.setText("INCORRECT!");
    }

修改：

我的解决方案：

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt)
    {
        // TODO add your handling code here:
    if (anagram.isCorrect(userInput.getText()))
    {
        answer.setText("CORRECT!");

        ActionListener taskPerformer = new ActionListener()
    {
    public void actionPerformed(ActionEvent evt)
    {
        anagram = new Anagram();
        word.setText(anagram.getRandomScrambledWord());
        answer.setText("");
        userInput.setText("");
    }
    };
    Timer timer = new Timer(3000, taskPerformer);
    timer.setRepeats(false);
    timer.start();
    } else
    {
        answer.setForeground(Color.pink);
        answer.setText("INCORRECT!");
    }
    }

我不确定，但我希望我是遵循MadProgrammer的建议而不是阻止事件本身，而是新线程。我也会查找Java Timer。

I am not sure, but I hope that I am following MadProgrammer's advice and not blocking the event itself, but the new thread. I will look up Java Timer also.

推荐答案

Swing是一个事件驱动的环境。当您阻止事件调度线程时，不能处理任何新事件。

Swing is an event driven environment. While you block the Event Dispatching Thread, no new events can be processed.

您永远不应该在任何耗时的过程中阻止EDT（例如I / O，循环或线程#sleep 例如）。

You should never block the EDT with any time consuming process (such as I/O, loops or Thread#sleep for example).

您可能希望通读事件调度线程了解更多信息。

You might like to have a read through The Event Dispatch Thread for more information.

相反，您应该使用 javax.swing.Timer 。在给定的延迟后它会触发 ActionListener 。

Instead, you should use a javax.swing.Timer. It will trigger a ActionListener after a given delay.

其好处是 actionPerformed 方法使用事件调度线程的上下文执行。

The benefit of which is that the actionPerformed method is executed with the context of the Event Dispatching Thread.

签出 this 或这个或这个或这个示例

这篇关于Java Swing：延迟后更改文本的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！