如何在 Java Swing 应用程序中添加简单的延迟?

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问题描述

我想知道如何在 Java 中的 Swing 应用程序中添加时间延迟，我使用了 Thread.sleep(time)，我也使用了 SwingWorker 但它不起作用.这是我的代码的一部分:

I'd like to know how to add a time delay inside a Swing app in Java, I used Thread.sleep(time), and also I used SwingWorker but it doesn't work. Here's part of my code:

switch (state) {
    case 'A':
        if (charAux == 'A') {
            state = 'B';
            //Here's where I'd like to add a time delay
            jLabel13.setForeground(Color.red);
            break;
        } else {
            //Here's where I'd like to add a time delay
            jLabel12.setForeground(Color.red);
            break;
        }
}

希望你能在我使用 SwingWorker 时帮助我或解决我的疑惑.

I hope you could help me or solve my doubts when I'm using SwingWorker.

推荐答案

这是一个使用 javax.swing.Timer

public class TestBlinkingText {

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException ex) {
                } catch (InstantiationException ex) {
                } catch (IllegalAccessException ex) {
                } catch (UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new BlinkPane());
                frame.setSize(200, 200);
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    protected static class BlinkPane extends JLabel {

        private JLabel label;
        private boolean state;

        public BlinkPane() {

            label = new JLabel("Look at me!");
            setLayout(new GridBagLayout());

            add(label);

            Timer timer = new Timer(500, new ActionListener() {

                @Override
                public void actionPerformed(ActionEvent ae) {
                    state = !state;
                    if (state) {
                        label.setForeground(Color.RED);
                    } else {
                        label.setForeground(Color.BLACK);
                    }
                    repaint();
                }
            });
            timer.setRepeats(true);
            timer.setCoalesce(true);
            timer.setInitialDelay(0);
            timer.start();
        }
    }
}

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