怎样实现一个java swing application启动时的progressBar, 
就象Java2Demo一样的progressBar, 但是他的太复杂了一点，
谁有更简单的方法？

这样做行不行：
//先用按钮触发事件
JButton start=new JButton("start");
JProgressBar ProgBar=new JProgressBar(0,100);
ActionListener I=new ActionListener(){
                                public void actionPerformed(ActionEvent e) { 
                                        if(timer == null) { 
                                            timer = new javax.swing.Timer(0, Begin()); //与JProgressBar关联的事件
                                            timer.start(); }
                                }
                                };
start.addActionListener(I);

//然后在JProgressBar相应的事件中加入用户需要的事件处理
 public ActionListener Begin()
            {
                    AbstractAction al=new AbstractAction(){
                
                                    public void actionPerformed (ActionEvent e) 
                                    { 
                                        if(JPrcB.getValue()