java 创建一个进度条

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.ProgressMonitor;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.UIManager;
public class MonitorToolbar extends JFrame implements ActionListener{
	static ProgressMonitor pbar = new ProgressMonitor(null, "监视进度", "进度..",0, 100);
	static int counter = 0;
	public MonitorToolbar(){
		setSize(250, 100);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Timer timer = new Timer(500,this);//this特指事件发生  void actionPerformed
		timer.start();
		setVisible(true);
	}
	public static void main(String[] args){
		UIManager.put("ProgressMonitor.progressText", "这个进程?");
		UIManager.put("OptionPane.cancelButtonText", "Go Away");
		new MonitorToolbar();
	}
	
	public void actionPerformed(ActionEvent e){
		SwingUtilities.invokeLater(new Runnable(){
			public void run(){
				if(pbar.isCanceled()){
					pbar.close();
					System.exit(1);
				}
				pbar.setProgress(counter);
				pbar.setNote("事件：" + counter + "% 完成");
				counter += 2;
			}
		});
	}
}