流的转换

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public class systemIn {

static BufferedReader br=null;
/**
* 键盘录入system.in
*/
public static void main(String[] args)throws IOException {
   br=new BufferedReader(
    new InputStreamReader(System.in));
//  String lineString=null;
//  while((lineString=br.readLine())!=null){
//   if("asd".equals(lineString))
//    break;
//   System.out.println(lineString.toUpperCase());
//  }
//  br.close();
  show();
}
/*
* 键盘输出system.out
* *
*/
public static void show()throws IOException{
  // 字符流转换为字节流
  BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(System.out));
String lineString=null;
     while((lineString=br.readLine())!=null){
           if("asd".equals(lineString))
                  break;
           bw.write(lineString.toUpperCase());
             bw.newLine();
           bw.flush();
   System.out.println(lineString.toUpperCase());
  }
  bw.close();
}
}