IO流的种类

字节流：InputStream（new FileInputStream（new File()）;　

　　　　Outpustream（new FileOutputStream（new File()）;

字符流:  Reader (new FileReader(new File);

　　　　Writer(new FileWriter(new File);

内存操作流：ByteArrayInputStream;　　ByteArrayOutputStream;

打印流：PrintStream,PrintWriter.

字符缓冲流：BufferedReader,BufferedWriter

数据操作流：DataInputStream,DataOutputStream

对象序列化：ObjectInputStream，ObjectOutputStream.