Java 我如何才能使jslider在滑动时真正影响事物？

我在这里设置了一个区域，jslider应该在这里改变jpanel中一些点的延迟

    JSlider source = (JSlider)e.getSource();
        if (source == speedSlider) {
            if (source.getValueIsAdjusting()) {
                GraphicsDisplay.delay += 100000;                  
            }
        }

延迟由以下因素影响：

 public static boolean stop = true ;          
 public static long delay = 3000000 ;


 public void paint ( Graphics g2 ) {

    //code making dots up here...


         int a;
         if ( !stop ) {
            for ( a=0; a<delay; a++ ) ; 
            moveDot ( ) ;  
         }
   repaint();
   }     

---

问题不在于滑块，而在于你的绘画

public void paint ( Graphics g2 ) {
    // Let's ignore the fact that you haven't called super.paint here...
    //code making dots up here...
    int a;
    if ( !stop ) {
        // Block the EDT, stop all painting and event processing until this for
        // exist...
        for ( a=0; a<delay; a++ ) ; 
        moveDot ( ) ;  
    }
    // This is a very bad idea inside any paint method...
    repaint();
}     

基本上，您正在阻止事件调度线程，阻止它实际绘制

public void paint ( Graphics g2 ) {
    // Let's ignore the fact that you haven't called super.paint here...
    //code making dots up here...
    int a;
    if ( !stop ) {
        // Block the EDT, stop all painting and event processing until this for
        // exist...
        for ( a=0; a<delay; a++ ) ; 
        moveDot ( ) ;  
    }
    // This is a very bad idea inside any paint method...
    repaint();
}     

您对

静态
变量的使用也有点吓人

ps-我忘了提到，您应该避免覆盖
paint
，而是使用
paintComponent
，确保先调用
super.paintComponent
，请参阅

private javax.swing.Timer timer;
//...

timer = new Timer(delay, new ActionListener() {
    public void actionPerformed(ActionEvent evt) {
        moveDot();
        repaint();
    }
});
timer.start();

//...

if (source.getValueIsAdjusting()) {
    timer.stop();
    timer.setDelay(source.getValue());
    timer.start();
}