通过 awt 和 setVisible() 正确使用事件和侦听器

Question

下面，我有两个事件应该按照指定的时间间隔发生。但尽管很奇怪，但这种情况却没有发生。

class MyFrame extends JFrame implements ActionListener
{
private ActionListener listener;
private Timer t1;

private ActionListener listener2;
private Timer t2;

private String recentUpdate = "NULL";
private String recentPrinted ="NULL";

public MyFrame()
{
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();// gets the maximum size of the screen 
    setSize(d.width,(d.height/100)*10);//sets it to max. need to change this

    // this shit find the max size of screen and puts it bottom left
    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    GraphicsDevice defaultScreen = ge.getDefaultScreenDevice();
    Rectangle rect = defaultScreen.getDefaultConfiguration().getBounds();
    int x = (int)rect.getMinX();
    int y = (int)rect.getMaxY()-getHeight();
    setLocation(x,y-30);
    setTitle("ALERT::OUTAGE");
    MyPanel panel = new MyPanel();
    add(panel);

    listener = this;            //I THINK THIS just says wait for the timer
    t1 = new Timer(50000,listener); // time for each repaint
    t1.start();                 //go

    listener2 = this;           
    t2 = new Timer(10000,listener2); //time to wait before setting visible again
    t2.start();         

    }

public void actionPerformed(ActionEvent event)
{
repaint();
}

public void newUpdate(ActionEvent q)
{
    // TODO Auto-generated method stub
    this.setVisible(true);
    System.out.println("Woopee!");
    //checkForNewUpdate();
}

基本上，我有一个程序，它从网页中获取文本并在整个页面上显示字幕样式。它会重新绘制并每次向左移动 5 个点，使其在动画中看起来流畅。

当框架关闭时，它隐藏在背景中。关闭时隐藏 当 checkForUPdate 运行时，如果有更新，则该页面将重新出现。

我现在遇到的问题是我可以有 2 个事件和 2 个计时器。但我注意到它们是如何工作的。我如何设置它以便重绘将在事件上触发并且 checkforUpdate() 将在 ActionEvent q 上发生

Answer 1

两个计时器最终都会触发相同的方法，actionPerformed。您的代码中没有任何内容可以调用 newUpdate。

Answer 2

需要定义听众。我不知道如何将计时器与事件结合起来

    listener = new ActionListener()
    {
        public void actionPerformed(ActionEvent event) 
        {
            checkForNewUpdate();
        }           
    };
    //I THINK THIS just says wait for the timer
    t1 = new Timer(3000,listener); // time for each repaint
    t1.start();                 //go



    listener2 = new ActionListener()
    {
          public void actionPerformed(ActionEvent q) 
          {repaint();}
    };
    t2 = new Timer(50,listener2); //time to wait before setting visible again
    t2.start();
}
public void actionPerformed(ActionEvent event)
{
    checkForNewUpdate();
    System.out.println("Woopee!");
    /**System.out.println(t2.getActionListeners().toString());*/ // just for testing
}