how to write an array to a file Java

Question

I have been trying to write an array to a file  I know how to write integers or String to a file but to bring an array confuses me  I am using this right now   public static void write  String file  int  x  throws IOException      BufferedWriter outputWriter   null      outputWriter   new BufferedWriter new FileWriter filename        outputWriter write  hi      Here I know i cant just write x 0  or anything  Do i need                                 to loop in order to write the array      outputWriter newLine        outputWriter flush          outputWriter close

User · Answer

You can use the ObjectOutputStream class to write objects to an underlying stream   outputStream   new ObjectOutputStream new FileOutputStream filename    outputStream writeObject x     And read the Object back like -  inputStream   new ObjectInputStream new FileInputStream filename    x    int   inputStream readObject

User · Answer

If you re okay with Apache commons lib  outputWriter write ArrayUtils join array

User · Answer

Just loop over the elements in your array   Ex   for int i 0  numOfElements  gt  i  i      outputWriter write array i        finish up down here

User · Answer

Like others said  you can just loop over the array and print out the elements one by one  To make the output show up as numbers instead of  letters and symbols  you were seeing  you need to convert each element to a string  So your code becomes something like this   public static void write  String filename  int  x  throws IOException    BufferedWriter outputWriter   null    outputWriter   new BufferedWriter new FileWriter filename      for  int i   0  i  lt  x length  i             Maybe      outputWriter write x i              Or      outputWriter write Integer toString x i        outputWriter newLine          outputWriter flush        outputWriter close          If you just want to print out the array like  1  2  3         you can replace the loop with this one liner   outputWriter write Arrays toString x

User · Answer

If the result is for humans to read and the elements of the array have a proper toString   defined     outputString write Arrays toString array

User · Answer

private static void saveArrayToFile String fileName  int   array  throws IOException       Files write     write to file         Paths get fileName      get path from file         Collections singleton Arrays toString array       transform array to collection using singleton         Charset forName  UTF-8      formatting

[java] how to write an array to a file Java

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