How to write new line character to a file in Java

Question

I have a string that contains new lines  I send this string to a function to write the String to a text file as       public static void writeResult String writeFileName  String text                try                   FileWriter fileWriter   new FileWriter writeFileName           BufferedWriter bufferedWriter   new BufferedWriter fileWriter            bufferedWriter write text               Always close files          bufferedWriter close                       catch IOException ex                System out println  Error writing to file     writeFileName                  end writeResult function   But when I open the file  I find it without any new lines  When I display the text in the console screen  it is displayed with new lines  How can I write the new line character in the text file   EDIT  Assume this is the argument text that I sent to the function above   I returned from the city about three o clock on that may afternoon pretty well disgusted with life  I had been three months in the old country  and was   How to write this string as it is  with new lines  in the text file  My function write the string in one line  Can you provide me with a way to write the text to the file including new lines    EDIT 2  The text is originally in a  txt file  I read the text using   while  line   bufferedReader readLine       null    sb append line     append the lines to the string sb append   n      append new line     end while   where sb is a StringBuffer

User · Answer

SIMPLE SOLUTION  File file   new File  F  ABC TXT    FileWriter fileWriter   new FileWriter file true   filewriter write   r n

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The BufferedWriter class offers a newLine   method  Using this will ensure platform independence

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This approach always works for me   String newLine   System getProperty  line separator    String textInNewLine    this is my first line     newLine    this is my second  line

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bufferedWriter write text     n    This method can work  but the new line character can be different between platforms  so alternatively  you can use this method   bufferedWriter write text   bufferedWriter newline

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Split the string in to string array and write using above method  I assume your text contains  n to get new line   String   test   test split   n      and the inside a loop   bufferedWriter write test i    bufferedWriter newline

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In EDIT 2   while  line   bufferedReader readLine       null      sb append line     append the lines to the string   sb append   n      append new line     end while   you are reading the text file  and appending a newline to it    Don t append newline  which will not show a newline in some simple-minded Windows editors like Notepad   Instead append the OS-specific line separator string using   sb append System lineSeparator       for Java 1 7 and 1 8   or  sb append System getProperty  line separator      Java 1 6 and below   Alternatively  later you can use String replaceAll   to replace   n  in the string built in the StringBuffer with the OS-specific newline character   String updatedText   text replaceAll   n   System lineSeparator     but it would be more efficient to append it while you are building the string  than append   n  and replace it later   Finally  as a developer  if you are using notepad for viewing or editing files  you should drop it  as there are far more capable tools like Notepad    or your favorite Java IDE

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Put this code wherever you want to insert a new line   bufferedWriter newLine

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PrintWriter out   null     for writting in file         String newLine   System getProperty  line separator       taking new line      out print  1st Line  newLine      print with new line     out print  2n Line  newLine       print with new line     out close

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Here is a snippet that gets the default newline character for the current platform  Use      System getProperty  os name   and     System getProperty  os version    Example   public static String getSystemNewline        String eol   null      String os   System getProperty  os name   toLowerCase        if os contains  mac            int v   Integer parseInt System getProperty  os version             eol    v  lt   9     r      n              if os contains  nix            eol     n       if os contains  win            eol     r n        return eol      Where eol is the newline

[java] How to write new line character to a file in Java

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