How to write an ArrayList of Strings into a text file

Question

I want to write an ArrayList lt String gt  into a text file    The ArrayList is created with the code   ArrayList arr   new ArrayList     StringTokenizer st   new StringTokenizer      line    Mode set - Out of Service In Service     while st hasMoreTokens         arr add st nextToken

User · Answer

If you need to create each ArrayList item in a single line then you can use this code  private void createFile String file  ArrayList lt String gt  arrData              throws IOException           FileWriter writer   new FileWriter file     txt            int size   arrData size            for  int i 0 i lt size i                  String str   arrData get i  toString                writer write str               if i  lt  size-1     This prevent creating a blank like at the end of the file                   writer write   n                      writer close

User · Answer

I think you can also use BufferedWriter    BufferedWriter writer   new BufferedWriter new FileWriter new File  note txt       String stuffToWrite   info   writer write stuffToWrite    writer close      and before that remember too add  import java io BufferedWriter

User · Answer

I would suggest using FileUtils from Apache Commons IO library It will create the parent folders of the output file if they don t exist while  Files write out arrayList Charset defaultCharset     will not do this throwing exception if the parent directories don t exist   FileUtils writeLines new File  output txt    encoding  list

User · Answer

You might use ArrayList overloaded method toString    String tmp arr toString    PrintWriter pw new PrintWriter new FileOutputStream file    pw println tmp substring 1 tmp length  -1

User · Answer

import java io FileWriter      FileWriter writer   new FileWriter  output txt     for String str  arr      writer write str   System lineSeparator       writer close

User · Answer

You can do that with a single line of code nowadays  Create the arrayList and the Path object representing the file where you want to write into   Path out   Paths get  output txt    List lt String gt  arrayList   new ArrayList lt  gt    Arrays asList    a     b     c         Create the actual file  and fill it with the text in the ArrayList     Files write out arrayList Charset defaultCharset

User · Answer

If you want to serialize the ArrayList object to a file so you can read it back in again later use ObjectOuputStream ObjectInputStream writeObject   readObject   since ArrayList implements Serializable   It s not clear to me from your question if you want to do this or just write each individual item   If so then Andrey s answer will do that

[java] How to write an ArrayList of Strings into a text file?

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