testjprogressbar2.java

疯狂Java讲义_源码(含Java设计模式CHM

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */
public class TestJProgressBar2
{
	JFrame frame = new JFrame("测试进度条");
	//创建一条垂直进度条
	JProgressBar bar = new JProgressBar(JProgressBar.VERTICAL );
	JCheckBox indeterminate = new JCheckBox("不确定进度");
	JCheckBox noBorder = new JCheckBox("不绘制边框");
	public void init()
	{
		Box box = new Box(BoxLayout.Y_AXIS);
		box.add(indeterminate);
		box.add(noBorder);
		frame.setLayout(new FlowLayout());
		frame.add(box);
		//把进度条添加到JFrame窗口中
		frame.add(bar);

		//设置在进度条中绘制完成百分比
		bar.setStringPainted(true);
		noBorder.addActionListener(new ActionListener()
		{  
			public void actionPerformed(ActionEvent event)
			{
				//根据该选择框决定是否绘制进度条的边框
				bar.setBorderPainted(!noBorder.isSelected());
			}
		});
		final SimulatedTarget target = new SimulatedTarget(1000);
		//以启动一条线程的方式来执行一个耗时的任务
		new Thread(target).start();
		//设置进度条的最大值和最小值,
		bar.setMinimum(0); 
		//以总任务量作为进度条的最大值
		bar.setMaximum(target.getAmount());
		Timer timer = new Timer(300 , new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				//以任务的当前完成量设置进度条的value
				bar.setValue(target.getCurrent());
			}
		});
		timer.start();
		indeterminate.addActionListener(new ActionListener()
		{  
			public void actionPerformed(ActionEvent event)
			{
				//设置该进度条的进度是否确定
				bar.setIndeterminate(indeterminate.isSelected());
				bar.setStringPainted(!indeterminate.isSelected());
			}
		});
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.pack();
		frame.setVisible(true);
	}
	public static void main(String[] args) 
	{
		new TestJProgressBar2().init();
	}
}
//模拟一个耗时的任务
class SimulatedTarget implements Runnable
{ 
	//任务的当前完成量
	private volatile int current;
	//总任务量
	private int amount;
	public SimulatedTarget(int amount)
	{  
		current = 0;
		this.amount = amount;
	}

	public int getAmount()
	{  
	  return amount;
	}

	public int getCurrent()
	{  
		return current;
	}
	//run方法代表不断完成任务的过程
	public void run()
	{  

		while (current < amount)
		{ 
			try
			{
				Thread.sleep(50);
			}
			catch(InterruptedException e)
			{

			}
			current++;
		}
	}
}