Java Fundamentals Hardening IO stream Note 60: Print flow improvements case for copying text files

1. Use the print stream to improve the case for copying a text file

2. code example:

1  Packagecn.itcast_03;2 3 ImportJava.io.BufferedReader;4 ImportJava.io.BufferedWriter;5 ImportJava.io.FileReader;6 ImportJava.io.FileWriter;7 Importjava.io.IOException;8 ImportJava.io.PrintWriter;9 Ten /* One * Requirements: Datastreamdemo.java copied to Copy.java A * Data Source: - * Datastreamdemo.java--read data--filereader--BufferedReader - * Destination: the * Copy.java--Write data--FileWriter--bufferedwriter--PrintWriter -  */ -  Public classCopyfiledemo { -      Public Static voidMain (string[] args)throwsIOException { +         //Previous Versions -         //Encapsulating Data Sources +         //bufferedreader br = new BufferedReader (New FileReader ( A         //"Datastreamdemo.java")); at         // //Package Destination -         //bufferedwriter bw = new BufferedWriter (New FileWriter ("Copy.java")); -         // -         //String line = null; -         //While (line = Br.readline ()) = null) { -         //Bw.write (line); in         //bw.newline (); -         //Bw.flush (); to         // } +         // -         //bw.close (); the         //br.close (); *  $         //improved version of the print streamPanax Notoginseng         //Encapsulating Data Sources -BufferedReader br =NewBufferedReader (NewFileReader ( the"Datastreamdemo.java")); +         //Package Destination APrintWriter PW =NewPrintWriter (NewFileWriter ("Copy.java"),true); the          +String line =NULL; -          while((Line=br.readline ())! =NULL){ $ pw.println (line); $         } -          - pw.close (); the br.close (); -     }Wuyi}

Java Fundamentals Hardening IO stream Note 60: Print flow improvements case for copying text files