Java:IO流的综合用法(从键盘录入数据并打印在控制台上)

import java.io.*;
public class IOTestDouble
{
    public static void main(String[] args)throws Exception
    {
        BufferedReader bufr = null;
        BufferedWriter bufw = null;
        try
        {
            bufr = new BufferedReader(new InputStreamReader(System.in));//读入流路径为键盘录入
            bufw = new BufferedWriter(new OutputStreamWriter(System.out));//输出流路径为控制台输出
            String line = null;
            //从键盘读取数据
            while((line = bufr.readLine()) != null)
            {
                bufw.newLine();
                if(line.equals("quit"))
                    break;
            //将数据打印在控制台上
                bufw.write(line);
            }
        }
        catch(IOException ie)
        {
            throw new RuntimeException("读入读取流异常");
        }
        finally
        {
            try
            {
               if(bufr!=null)
                  bufr.close();
            }
            catch(IOException ie)
            {
               throw new RuntimeException("读取流关闭异常");    
            }
            try
            {
               if(bufw!=null)
                  bufw.close();
            }
            catch(IOException ie)
            {
               throw new RuntimeException("输出流关闭异常");    
            }
        }
    }
}