IO概述

• 常用源
  
  1. 文件
  2. 管道pipes
  3. 网络连接
  4. 设备
• 流
  
  1. 字节流（8-bit bytes）InputStream/OutputStream
  2. 字符流（16-bit bytes）Reader/Writer

public class IOBytesDemo{    public static void main(String[] args) throws IOException{    FileInputStream in = null;    FileOutputStream out = null;    String sourcePath = "";    String destinationPath = "";    try{        in = new FileInputStream(sourcePath);        out = new FileOutputStream(destinationPath);        while((c = in.read())!= -1){        out.write(c);        }     }finally{      if(in !+null){          in.close():      }      if(out!=null){          out.close;      }    }  }}

public class IOCharactersDemo {    public static void main(String[] args) throws IOException {        FileReader inputStream = null;        FileWriter outputStream = null;        try {            inputStream = new FileReader("xanadu.txt");            outputStream = new FileWriter("characteroutput.txt");            int c;            while ((c = inputStream.read()) != -1) {                outputStream.write(c);            }        } finally {            if (inputStream != null) {                inputStream.close();            }            if (outputStream != null) {                outputStream.close();            }        }    }}