我的 JProgressBar 直到 100% 才更新

好的，我有以下代码。

public class MyProgressBar extends JPanel implements MyData, Serializable {

    /**
     * 
     */

    public static final int MAX                = 10000;
    public static final int WIDTH              = 400;
    public static final int HEIGHT             = 75;

    private JProgressBar    MyBar              = new JProgressBar( SwingConstants.HORIZONTAL, 0, MAX );
    private JFrame          MyFrame            = new JFrame();

    private int             MyValue            = 0;

    private Thread          MyThread           = new Thread( new ProgressThread() );



    public MyProgressBar() {
        add(MyBar);

        int x = ( MyData.SCREEN.width  / 2 ) - ( WIDTH  / 2);
        int y = ( MyData.SCREEN.height / 2 ) - ( HEIGHT / 2);

        this.setBounds( x, y, WIDTH, HEIGHT );

        MyFrame.setBounds( x, y, WIDTH, HEIGHT );
        MyFrame.setUndecorated(true);
        MyFrame.getContentPane().setSize( new Dimension( WIDTH, HEIGHT ) );
        MyFrame.setMinimumSize( new Dimension( WIDTH, HEIGHT ) );
        MyFrame.setPreferredSize( new Dimension( WIDTH, HEIGHT ) );
        MyFrame.setSize( new Dimension( WIDTH, HEIGHT ) );
        MyFrame.setVisible(false);
        MyFrame.getContentPane().setLayout(null);

        MyBar.setStringPainted( true );
        MyBar.setBorderPainted( true );
        MyBar.setValue( 0 );
        MyBar.setBounds( 0, 0, WIDTH, HEIGHT );

        MyFrame.add( MyBar );
        MyFrame.pack();
        MyFrame.repaint();

    }

    public void MyUpdateBar() {
        MyBar.setValue( MyValue );
        MyBar.repaint();
        MyFrame.repaint();
        this.repaint();
        //dbug.Message( "MYPROGRESSBAR", "MyUpdateBar", "Value is %3.2f %d", MyBar.getPercentComplete(), MyValue );
    }

    public void MySetValue( int percent ) {
        MyValue = (int)( MAX * ( (double)percent / 100.0 ) );
        MyUpdateBar();
        //dbug.Message( "MYPROGRESSBAR", "MySetValue", "Value is %3.2f %d percent was %d", MyBar.getPercentComplete(), MyValue, percent );
    }

    public void CreateAndShow () {
        MyFrame.setVisible(true);
        MyThread.start();
    }

    public void HideAndClear () {
        MyThread.stop();
        //frame.setVisible(false);
    }

    class ProgressThread implements Runnable {
        public void run() {
            EventQueue.invokeLater(new Runnable() {
                public void run() {
                    while( MyValue < MyBar.getMaximum() ) {
                        MyBar.setValue( MyValue );
                        MyBar.repaint();
                        MyFrame.repaint();
                        dbug.Message( "MYPROGRESSBAR", "THREAD", "Value is %3.2f %d", MyBar.getPercentComplete(), MyValue );
                    }
                }
            });
        }

    }



}

如您所见，我创建了一个课程，我想用它来显示进度。发生的事情是我实例化该类。加载我的 XML 文件，然后当我解析数据时，我调用更新 MyValue，当我让我的调试消息出来时我会看到它。然而，直到 100% 完成后，栏本身才会显示。我已经阅读过有关线程的内容并遵循其他人的示例，如果我将其保留为他的示例，它就可以工作。如果我做了一些调整（更改线程中的循环以填充进度条的设置值以读取值），它甚至不会显示，直到它达到 100。

我做错了什么？

Thanks!

你线程执行SwingUtilities.invokeLater。您正在有效地运行 SwingEvent Dispatch Thread。不确定你想实现什么目标。但看起来你正在阻止EDT和你的while循环未更新为MySetValue没有被执行。

考虑使用SwingWorker用于长时间操作。如何使用进度条 http://docs.oracle.com/javase/tutorial/uiswing/components/progress.html演示了使用SwingWorker with JProgressBar.

确保你打电话setValue方法从Event Dispatch Thread。您可以使用SwingUtilities.invokeLater为了那个原因。阅读更多关于线程和摆动 http://java.sun.com/products/jfc/tsc/articles/threads/threads1.html.

考虑这个简化的示例：

public static void main(String[] arguments) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(EXIT_ON_CLOSE);

    final JProgressBar bar = new JProgressBar(0, 100);

    Thread t = new Thread(){
        public void run(){
            for(int i = 0 ; i < 100 ; i++){
                final int percent = i;
                SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        bar.setValue(percent);
                    }
                  });

                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {}
            }
        }
    };
    frame.add(bar);
    frame.pack();
    frame.setVisible(true);
    t.start();
}