Question

这是我的第一篇文章，请原谅我初学者的错误。

我的程序结构如下：

我有一个基本创建对象数组的类：

class fieldCreator extends JPanel
{
    ...
    fieldCell[] fieldArray;
    ...
    public fieldCreator()
    {
        while (counterVar < arraySize)
        {
            // fill the array randomly with one object out of three different classes
            if ((int)(Math.random()) == 0)
                this.fieldArray[counterVar] == new cellType0();
            ...
            counterVar++;
        }
    }
    public moveMethod()
    {
        // rearange the content of the array by a certain algorithm
        ...
        try 
        {
           Thread.sleep(150L); // this is to slow down the loop frequency
        }
        catch (Exception e) {}
    }
    public void paintComponent (Graphics g)
    {
        while (counterVar < arraySize)
        {
            // draw a rectangle for each object in the array in a specific color
            // create the illusion of a 2D field 
            counterVar++;
        }   
    }
}

主类创建框架结束执行方法：

class Main extends JPanel 
{
    ...
    public static fieldCreator myField;
    ...
    public static void main (String[] args)
    {

        main myMain = new main();
        myField = new fieldCreator();

        main.framework();

        // !!! this loop is what i want to start/stop by a button bash !!!
        while(true)
        {
            myField.moveMethod();
            myField.repaint();
        } 
    }  
    public void frameWork()
    {
        JFrame myFrame = new JFrame();
        JButton startButton = new JButton ("Start");
        JButton stopButton = new JButton ("Stop");
        startButton.addActionListener(new startListener());
        stopButton.addActionListener(new stopListener());
        myFrame.getContentPane().add(BorderLayout.NORTH, startButton);
        myFrame.getContentPane().add(BorderLayout.CENTER, myField);
        myFrame.getContentPane().add(BorderLayout.SOUTH, stopButton);
        ...
    }

    class startListener implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {   
            //this does not work!!!
            //while(true)
            //{
            //    myField.moveMethod();
            //    myField.repaint();
            //}
        }
    }

    class stopListener implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            // ---- this needs to be implemented ----
        }
    }
}

通过IDE启动和停止程序，该程序正常工作，该字段在每个周期刷新并正确显示。但是当涉及到实现按钮时，它根本不刷新。

我希望缩短代码不会影响可理解性:) 我感谢你的一切帮助！

Answer 1

从ActionListener开始动画的原因不起作用，是循环阻止event dispatch thread。从main()运行时代码似乎工作的原因是main()在另一个线程中运行。

对于一个简单的，定时的重复通话，就像你一样，最简单的就是使用摆动Timer。

作为旁注，在EDT中组件也应该是created。

Answer 2

我解决了以下问题：

class Main extends JPanel 
{
    public static void main(String[] args)
    {
        ...
        timer = new Timer(timerDelay, main.new timerListener());
        ...
    }

    class timerListener implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            myField.moveMethod();
            myField.repaint();
        }
    }

    class startButtonListener implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            timer.start();
            startButton.setText("RUNNING...");
        }
    }

    class stopButtonListener implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            timer.stop();
            startButton.setText("START");
        }
    }
}

摆动动画开始停止

2 个答案: