public static void main(String[] args) throws IOException

{

    //创建对象

    PrintStream ps = new PrintStream("myfile\\print.txt");

    //写入整数

    ps.write(355); //文件里面是c，只是写入整数的最低字节，也就是最后8位二进制

    ps.print(355);  //文件里面是355，写什么就是什么,原理就是把数组转成了字符串

    ps.close();

}

public static void main(String[] args) throws IOException

{

    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    PrintWriter pw = new PrintWriter(System.out);

    String line = null;

    while((line = br.readLine()) != null){

        if("//over".equals(line)){

            break;

        }

        pw.println(line.toUpperCase());

        pw.flush();

    }

}