IO流--流转换

import java.io.*;

//键盘读入 字节流转换成字符流操作 提高效率
public class io {
    public static void main(String[] args) throws IOException
    {
        /*
         获取键盘录入对象 循环
        InputStream in = System.in;

        将字节流对象转成字符流对象   试用转换流
        InputStreamReader isr = new InputStreamReader(in);

        为了提高效率 将字符串进行缓冲区技术高效操作  使用BufferedReader
        BufferedReader bufr = new BufferedReader(isr);
        */
        //三句话合并一句
        BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));

        /*
        OutputStream out = System.out;
        OutputStreamWriter osw = new OutputStreamWriter(out);
        BufferedWriter bufw = new BufferedWriter(osw);
        */
        //合并后
        BufferedWriter bufw = new BufferedWriter(new OutputStreamWriter(System.out));

        String line = null;
        while((line=bufr.readLine())!=null)//从输入中读出
        {
            if("over".equals(line)) //键盘输入结束标志位  默认Ctrl+C结束
                break;
            //从键盘读入流输出
            System.out.println(1+line.toUpperCase());

            //从写出流输出
            bufw.write(2+line.toUpperCase());
            bufw.newLine();
            bufw.flush();
        }
        bufr.close();
        bufw.close();
    }

}