about.java

这是一个基于java的多线程下载工具！大家用用看怎样

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.*;
public class About extends JDialog{
	JLabel label;
	JPanel panel;
	JTextArea ta;
	JScrollPane sp;
	String s1,s2,s3;
	JButton button;
	Container contentPane;
	public About(JFrame parent){
		super(parent,"关于制作室...");
		init();
	}
	public void init(){
		s1="java多线程下载小工具 1.0";
		s2="	Welcome to use java多线程下载小工具 1.0!";
		s3="  制作室人员：\n\n    计算机科学系2003级非师范本科1班：\n	徐俊茂  -  200310301214\n	何海辉  -  200310290000\n	彭姣姣  -  200310301227\n     计算机科学系2003级师范本科1班：\n	田胡连  -  200310291129\n	殷    睿  -  200208251101\n	杨柳青  -  200310290000\n\n		联系方式：[e-mail]";
		contentPane=getContentPane();
		button=new JButton("确定");
		button.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e){
				dispose();
			}
		});
		label=new JLabel(s1);
		panel=new JPanel();
		panel.add(label);
		ta=new JTextArea(10,8);
		ta.setEditable(false);
		ta.setText(s2+"\n\n\n"+s3);
		sp=new JScrollPane(ta);
		contentPane.add(panel,BorderLayout.NORTH);
		contentPane.add(sp,BorderLayout.CENTER);
		contentPane.add(button,BorderLayout.SOUTH);
	}
	//实现焦点切换
	public void center(){
		Dimension screenSize,size;
		screenSize=Toolkit.getDefaultToolkit().getScreenSize();
		size=this.getSize();
		if(size.height > screenSize.height){
           size.height=screenSize.height;
        }
        if(size.width >screenSize.width){
           size.width=screenSize.width;
        }
        this.setLocation((screenSize.width - size.width)/2,
           (screenSize.height - size.height)/2);
    }
	
}