Overwriting txt file in java

Question

The code I ve written is supposed to overwrite over the contents of the selected text file  but it s appending it  What am I doing wrong exactly   File fnew new File     playlist   existingPlaylist getText     txt    String source   textArea getText    System out println source   FileWriter f2   try       f2   new FileWriter fnew false       f2 write source         for  int i 0  i lt source length   i                  if source charAt i     n               f2 append System getProperty  line separator             f2 append source charAt i                f2 close      catch  IOException e               TODO Auto-generated catch block         e printStackTrace                   EDIT  I tried making a new temp txt file and writing the new contents into that  deleting this text file and renaming temp txt to this one  Thing is  the deletion is always unsuccessful  I don t think I have to change user permissions for this do I   Also  a part of my program lists all the files in this directory  so I m guessing they re being used by the program and so can t be deleted  But why not overwritten   SOLVED  My biggest  D oh  moment  I ve been compiling it on Eclipse rather than cmd which was where I was executing it  So my newly compiled classes went to the bin folder and the compiled class file via command prompt remained the same in my src folder  I recompiled with my new code and it works like a charm   File fold new File     playlist   existingPlaylist getText     txt    fold delete    File fnew new File     playlist   existingPlaylist getText     txt    String source   textArea getText    System out println source    try       FileWriter f2   new FileWriter fnew  false       f2 write source       f2 close      catch  IOException e        e printStackTrace

User · Answer

Add one more line after initializing file object  File fnew   new File     playlist     existingPlaylist getText       txt    fnew createNewFile

User · Answer

The easiest way to overwrite a text file is to use a public static field   this will overwrite the file every time because your only using false the first time through    public static boolean appendFile    Use it to allow only one time through the write sequence for the append field of the write code to be false      use your field before processing the write code  appendFile   False   File fnew new File     playlist   existingPlaylist getText     txt    String source   textArea getText    System out println source   FileWriter f2   try          change this line to read this         f2   new FileWriter fnew false           to read this     f2   new FileWriter fnew appendFile      important part     f2 write source           change field back to true so the rest of the new data will        append to the new file       appendFile   true       f2 close       catch  IOException e              TODO Auto-generated catch block        e printStackTrace

User · Answer

SOLVED  My biggest  D oh  moment  I ve been compiling it on Eclipse rather than cmd which was where I was executing it  So my newly compiled classes went to the bin folder and the compiled class file via command prompt remained the same in my src folder  I recompiled with my new code and it works like a charm   File fold   new File     playlist     existingPlaylist getText       txt    fold delete     File fnew   new File     playlist     existingPlaylist getText       txt     String source   textArea getText    System out println source    try       FileWriter f2   new FileWriter fnew  false       f2 write source       f2 close       catch  IOException e        e printStackTrace

User · Answer

This simplifies it a bit and it behaves as you want it   FileWriter f   new FileWriter     playlist   existingPlaylist getText     txt     try    f write source          catch          finally      close it here

User · Answer

Your code works fine for me   It replaced the text in the file as expected and didn t append   If you wanted to append  you set the second parameter in   new FileWriter fnew false     to true

[java] Overwriting txt file in java

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