• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

FileOutputStream not writing to a file

 
Ranch Hand
Posts: 674
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi I am using a FileOutputStream to write a file but it is not writing data to destination file from source

Here is my code



can any one find a bug where i am wrong why data is not on output file?


Thanks
 
Bartender
Posts: 4179
22
IntelliJ IDE Python Java
  • Likes 1
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
How do you know nothing is written to the file? Those four bytes are non-displayed characters, so simply opening the file in a text editor probably wouldn't be proof that nothing was written.
 
Kishor Joshi
Ranch Hand
Posts: 674
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Thanks

yes you are true

there is something displayed but they are not those values that I write on that file.


So how to read actual values?

any typecasting or else


 
Marshal
Posts: 4499
572
VSCode Eclipse IDE TypeScript Redhat MicroProfile Quarkus Java Linux
  • Likes 1
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Try writing out these bytes: 74, 97, 118, 97
 
Kishor Joshi
Ranch Hand
Posts: 674
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Thanks

It works it prints

j a v a

Can you explain why this is happening?
 
Ranch Hand
Posts: 411
5
IntelliJ IDE Java Linux
  • Likes 1
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Text editors are designed to interpret a specific range of bit-patterns according to a character set... the bit-patterns of 74, 97, 118, 97 are mapped to the characters J, a, v, a according to the ASCII character set hence the reason for output...

To help you map certain characters to certain number-encodings you can refer to this table >> ascii table
 
Kishor Joshi
Ranch Hand
Posts: 674
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Thanks Rico
 
Steve Luke
Bartender
Posts: 4179
22
IntelliJ IDE Python Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Or, if your intent is to write character output instead of binary output, you should use a Writer instead of an OutputStream. A FileWriter would be the closes analog, but a PrintWriter would work well here I think.
 
Marshal
Posts: 79177
377
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Or a Formatter, but that will only write to text files.
 
Is this the real life? Is this just fantasy? Is this a tiny ad?
a bit of art, as a gift, that will fit in a stocking
https://gardener-gift.com
reply
    Bookmark Topic Watch Topic
  • New Topic