java温故而知新（6）深入理解IOStream

-------------------------------------------------------------------------------1. Creat node stream;2. Upgrade node stream to processing stream if necessary3. Use the methods in the stream object to read or write4. Close the stream and release the resource------------------------------------------------------------------------------1. Create InputStream/Reader2. Upgrade to Buffered3. Use readLine()   While((str=in.readln())!=null)4. close()------------------------------------------------------------------------------1. Create OutputStream/Writer2. Upgrade to PrintWriter3. Use println()4. close()

import java.io.*;/*1. Creat node stream;2. Upgrade node stream to processing stream if necessary3. Use the methods in the stream object to read or write4. Close the stream and release the resource--------------------------------------------------------1. Create InputStream/Reader2. Upgrade to Buffered3. Use readLine()   While((str=in.readln())!=null)4. close()--------------------------------------------------------1. Create OutputStream/Writer2. Upgrade to PrintWriter3. Use println()4. close()*/public class IOProcessSample{ public static void main(String[] args) {  //Create a file based on the first command-line argument to the program  File file= new File(args[0]);  //Create buffered reader from the standard input  BufferedReader in=new BufferedReader(new InputStreamReader(System.in));      System.out.println("Press ctr-d or ctr-z to end");  String str;  try{   //Create a print write to write on a file   //PrintWriter is required to handled the IO exception   PrintWriter out= new PrintWriter(file);   //Read from the standard input and write to the file   while((str=in.readLine())!=null){    out.println(str);   }   //close the stream and release the resource   in.close();   out.close();  }  catch(FileNotFoundException e){   System.err.println("File not found in part 1 : "+file);  }  catch (IOException e){   e.printStackTrace();  }  finally{   System.out.println("-----------Part1 is ended-----------------------");  }  //////////////////////////////////////////////////////////////////////////////  try{   //Create a buffer reader from a file   in=new BufferedReader(new FileReader(file));   //Read the file and print the content on the screen.   while((str=in.readLine())!=null){    System.out.println(str);   }   //close the stream and release the resource   in.close();  }  catch (FileNotFoundException e){   System.err.println("File not found in part 2: "+file);  }  catch (IOException e){   e.printStackTrace();  }  finally{   System.out.println("----------------------The End -------------------------");  } }}