标准输入流：
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
常调用输入方法：readLine(),String
网络编程接收字符的输出：
PrintWriter pw=new PrintWriter(socket.getOutputStream(),true));
常调用输出方法：println(Sring str)，void
网络编程接收字符的输入：
BufferedReader br=new BufferedReader(newInputStreamReader(socket.getInputStream()));
常调用输入方法：readLine(),String
输出为什么不调用BufferedWriter
因为BufferedWriter没有自动刷新功能，要刷新，则调用其flush方法，它的write方法没有换行，则会在客户端与服务端之间导致阻塞。
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| 输入流 | 输出流 |
| 抽象字节流 | InputStream | OutputStream |
| 常用方法 | read(byte[ ] ) | write(byte[ ]) |
| 常用字节流 | FileInputStream | FileOutputStream |
| 数据字节流 | DataInputStream(InputStream ) | DataOutputStream(OutputStream )
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| 数组字节流 | ByteArrayInputStream(byte [] ) | ByteArrayOutputStream() |
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| 抽象字符流 | Reader | Writer |
| 常用方法 | read(char[ ]) | write(char[ ]) |
| 常用字符流 | FileReader | FileWriter |
| 常用转换流 | InputStreamReader(InputStream) | OutputStreamWriter(OutputStream ) |
| 常用缓冲流 | BufferedReader(Reader ) | BufferedWriter(Writer ) |
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| 打印字符流 | PrintWriter(OutputStream )
| 常用方法：println |
| 打印字节流 | PrintStream(OutputStream )
| 常用方法：println |