Java 监听进度条的变化事件

package com.mingrisoft.jprogressbar;

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.Jframe;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.SwingWorker;
import javax.swing.UIManager;
import javax.swing.JProgressBar;
import javax.swing.JLabel;
import javax.swing.event.ChangeListener;
import javax.swing.event.ChangeEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.List;
import java.awt.Font;
import javax.swing.SwingConstants;

public class StateChangeBar extends Jframe {
    
    /**
     * 
     */
    private static final long serialVersionUID = 3631585803783649593L;
    private JPanel contentPane;
    private JProgressBar progressBar;
    private J

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     文件         232  2010-09-11 17:00  .classpath
     文件         379  2010-09-11 17:00  .project
     文件    11712343  2010-09-28 14:30  监听进度条的变化事件.exe
     文件         829  2013-11-21 08:41  bin\com\mingrisoft\jprogressbar\StateChangeBar$1.class
     文件         781  2013-11-21 08:41  bin\com\mingrisoft\jprogressbar\StateChangeBar$2.class
     文件         816  2013-11-21 08:41  bin\com\mingrisoft\jprogressbar\StateChangeBar$3.class
     文件        2018  2013-11-21 08:41  bin\com\mingrisoft\jprogressbar\StateChangeBar$Activity.class
     文件        3558  2013-11-21 08:41  bin\com\mingrisoft\jprogressbar\StateChangeBar.class
     文件        3759  2010-09-11 17:00  src\com\mingrisoft\jprogressbar\StateChangeBar.java