public SwingWorkerTest() {
        
        setTitle("SwingWorker\u4F7F\u7528");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 300, 150);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(new GridLayout(2, 1, 5, 5));
        
        JPanel labelPanel = new JPanel();
        contentPane.add(labelPanel);
        labelPanel.setLayout(new BorderLayout(0, 0));
        
 [color=#FF0000]       label = new JLabel("");[/color]
        label.setHorizontalAlignment(SwingConstants.CENTER);
        labelPanel.add(label);
        
        JPanel buttonPanel = new JPanel();
        contentPane.add(buttonPanel);
        
        JButton button = new JButton("\u751F\u6210\u968F\u673A\u6570");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                do_button_actionPerformed(e);
            }
        });
        buttonPanel.add(button);        
    }
    
    protected void do_button_actionPerformed(ActionEvent e)
    {
        RandomNumber random = new RandomNumber();
        random.execute();
    }
    
    private class RandomNumber extends SwingWorker<Void, Integer>{
        @Override
        protected Void doInBackground() throws Exception {
            TreeSet<Integer> set = new TreeSet<Integer>();// 创建一个TreeSet类型对象
            for (int i = 0; i < 1000; i++) {
                set.add(new Random().nextInt());// 在TreeSet中存入1000个随机整数
            }
            label.setText("最大随机数是：" + set.last());// 在标签上显示最大的整数
            return null;
        }
    }