◇ 生成流对象
public BufferedReader(Reader in); //使用缺省的缓冲区大小
public BufferedReader(Reader in, int sz); //sz为缓冲区的大小
public BufferedWriter(Writer out);
public BufferedWriter(Writer out, int sz);
◇ 读入/写出字符
除了Reader和Writer中提供的基本的读写方法外,增加对整行字符的处理。
public String readLine() throws IOException; //读一行字符
public void newLine() throws IOException; //写一行字符