为什么重新绘制（长）立即重绘？

根据Javadoc的说法，JComponent.repaint(long)应该在未来的某个时间安排repaint（）。当我尝试使用它时，它总是触发重新绘制。我究竟做错了什么？为什么重新绘制（长）立即重绘？

import java.awt.AlphaComposite; 
import java.awt.Color; 
import java.awt.Graphics; 
import java.awt.Graphics2D; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.Timer; 

public class Repaint 
{ 
    public static final boolean works = false; 

     private static class CustomComponent extends JPanel 
    { 
    private float alpha = 0; 

    @Override 
    protected void paintComponent(Graphics g) 
    { 
     super.paintComponent(g); 
     Graphics2D g2d = (Graphics2D) g; 
     g2d.setComposite(
     AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha)); 
     g2d.setPaint(Color.BLACK); 
     g2d.fillRect(0, 0, getWidth(), getHeight()); 
     alpha += 0.1; 
     if (alpha > 1) 
     alpha = 1; 
     System.out.println("alpha=" + alpha); 
     if (!works) 
     repaint(1000); 
    } 
    } 

    public static void main(String[] args) 
    { 
    final JFrame frame = new JFrame(); 
    frame.getContentPane().add(new CustomComponent()); 
    frame.setSize(800, 600); 
    frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); 
    frame.setVisible(true); 

    if (works) 
    { 
     new Timer(1000, new ActionListener() 
     { 
     @Override 
     public void actionPerformed(ActionEvent e) 
     { 
      frame.repaint(); 
     } 
     }).start(); 
    } 
    } 
}

来源

2009-12-10 Gili