Java 动态重绘面板

我想做一个程序，展示一个水池如何充满时间的动画。问题是我不能让它每次都刷新。。。代码如下：它可以工作，但不会在循环中刷新，但如果我手动调整窗口大小，我可以在面板中看到它的新绘制：

static class _cistern extends JPanel{

    private volatile double _maxCapacity;
    private double _flux;
    private volatile double currentStorage = 0.0;
    private boolean IsStarted = false;
    private volatile int Up = 1;

    private Thread Fill = new Thread(new Runnable(){
         @Override
        public void run(){
            while(currentStorage < _maxCapacity){
                currentStorage += _flux;
                try{Thread.sleep(500);}catch(Exception ex){}
                repaint();
            }
        }
    });

    public _cistern(double MaximunCapacity, double Flux, double CurrentStorage){
        setPreferredSize(new Dimension(800, 600));
        setBackground(Color.BLACK);
        IsStarted = true;
        Fill.start();
    }

     @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setColor(Color.WHITE);
        g2.drawOval(getWidth()/20, getHeight()/15, getWidth() - getWidth()/10, getHeight() - getHeight()+20);
        g2.drawLine(getWidth()/20, getHeight()/15+10, getWidth()/20, (getHeight() - getHeight()/15)-10);
        g2.drawOval(getWidth()/20, (getHeight() - getHeight()/15 - 20), getWidth() - getWidth()/10, getHeight() - getHeight()+20);
        g2.drawLine(getWidth() - getWidth()/20, getHeight()/15 +10, getWidth() - getWidth()/20, (getHeight() - getHeight()/15)-10);

        if(IsStarted){ //I know I have some drawings wrong here
                       //I can fix them but I just want this to refresh dinamically. The problema is the REFRESH PAINT.
                       //If you test code and see bad drawing, that's not the problema, I want to see it refreshing :P, that's the question. Don't fix this
            g2.setColor(Color.BLUE);
            g2.drawOval(getWidth()/20, (getHeight() - getHeight()/15 - 20) - Up++, getWidth() - getWidth()/10, getHeight() - getHeight()+20 - Up++);

            g2.drawLine(getWidth()/20, (getHeight() - getHeight()/15)-10, getWidth()/20, (getHeight() - getHeight()/15)-10);
            g2.drawLine(getWidth() - getWidth()/20, getHeight()/15 +10, getWidth() - getWidth()/20, (getHeight() - getHeight()/15)-10);

            g2.drawOval(getWidth()/20, (getHeight() - getHeight()/15 - 20), getWidth() - getWidth()/10, getHeight() - getHeight()+20);
        }

    }

}

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谢谢：p

看了我的代码一段时间后，我想起我正在使用一个线程调用和EDT。。。所以我必须补充一点：

private Thread Fill = new Thread(new Runnable(){
         @Override
        public void run(){
            while(currentStorage < _maxCapacity){
                currentStorage += _flux;
                try{Thread.sleep(500);}catch(Exception ex){}
                SwingUtilities.invokeLater(new Runnable(){
                public void run(){
                revalidate();
                repaint();
                }
                });
            }
        }
    });

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使用Swing计时器而不是线程，这样更安全……您可能希望进行通读，这将使人们更容易阅读您的代码，您也更容易阅读其他代码。不要从paintComponent方法中修改组件的状态，绘制是为了绘制。调用paintComponent可能有多种原因，导致不可预知的结果当我一直在处理您的代码时，您应该知道Java graphics对负值的响应不好…@AndrewThompson哦，是的！重绘是Swing中为数不多的线程安全方法之一。重新验证与您的情况无关，如果您不想更新容器的布局hierarchy@MadProgrammer大概我需要使用线程，而不是计时器，因为这是一个简单的家庭作业。我真的不喜欢java，但无论如何我都要学习它，尽可能地学习一些有用的东西。我知道使用重绘是不好的，但正如所说的，在持续快速更新中重绘更好我的原始循环每秒更新10次，而不是本例中的500毫秒，我应该使用它而不是更新。无论如何，谢谢你！！