字节流通向字符流的转换流:字符流Reader的子类InputStreamReader

public class Demo16 {
    public static void main(String[] args) throws IOException {
        //字节流
        InputStream in = System.in;

        //字节流转换成字符流，转换流
        InputStreamReader isr = new InputStreamReader(in);

        //高效字符流
        BufferedReader bufr = new BufferedReader(isr);

        String line = null;
        while((line = bufr.readLine()) != null) {
            if(line.equals("over"))
                break;
            System.out.println(line.toUpperCase());
        }
    }
}

字符通向字节流的转换流:字符流Writer的子类outputStreamWriter

public class Demo17 {

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

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

    BufferedWriter bufw = new BufferedWriter(new OutputStreamWriter(System.out));

    String line = null;
    while((line=bufr.readLine()) != null) {
        if("over".equals(line))
            break;
        bufw.write(line.toUpperCase());
        bufw.newLine();
        bufw.flush();
    }
}

}