Writing objects to a file

[Marcelo]

Hi everybody,

I am searching the web in order to find how to write objects (Vector
objects) inside a file.

However, I don't find anything about it. Do you a class that can make
this? I just want a name in order to find the information (it's that i
don't know where to search./..)

thanks

Marcelo

 

[Oliver Wong]

Hi everybody,

I am searching the web in order to find how to write objects (Vector
objects) inside a file.

However, I don't find anything about it. Do you a class that can make
this? I just want a name in order to find the information (it's that i
don't know where to search./..)

thanks

Try searching for "Serialization", "Serializable", "Serialize" and other
varations on the term.

- Oliver

 

[Monique Y. Mudama]

Hi everybody,

I am searching the web in order to find how to write objects (Vector
objects) inside a file.

However, I don't find anything about it. Do you a class that can
make this? I just want a name in order to find the information (it's
that i don't know where to search./..)

thanks

Marcelo

Try searching on the word 'serialize'

 

[Steve Horsley]

Hi everybody,

I am searching the web in order to find how to write objects (Vector
objects) inside a file.

However, I don't find anything about it. Do you a class that can make
this? I just want a name in order to find the information (it's that i
don't know where to search./..)

thanks

Marcelo

java.ibjectOutputStream
java ibjectInputStream

Steve

 

[Marcelo]

Hello, thanks for helping me.

I have another problem. What should I do in order to remove an Object in
my file? should i copy everything of my file into another file without
the given element and then replace the old file? Is there a another way?

thanks

Marcelo

 

[Thomas Weidenfeller]

I have another problem. What should I do in order to remove an Object in
my file? should i copy everything of my file into another file without
the given element and then replace the old file?
Yes.

Is there a another way?

- Design an own, more flexible file format than just a sequence of
serialized objects, or

- Use a database.

/Thomas

 

[Roedy Green]

I have another problem. What should I do in order to remove an Object in
my file? should i copy everything of my file into another file without
the given element and then replace the old file? Is there a another way?

You use a database with blobs of serialised objects. The SQL engine
deals with the problem. You can't do anything other than copy with a
sequential file.

You might consider a RandomAccessFile with variable length records of
serialised groups of objects, but that gets pretty hairy pretty
quickly and is not worth the effort given how many free SQL engine
there are.

See http://mindprod.com/projects/hermitcrab.html
if you get the urge to invent a streamlined wheel.