Re: Read a file to get an ArrayList

From:

Nigel Wade <nmw@ion.le.ac.uk>

Newsgroups:

comp.lang.java.help

Date:

Thu, 22 Jul 2010 17:30:14 +0100

Message-ID:

<i29ro4$c7f$1@south.jnrs.ja.net>

On 22/07/10 15:51, Lew wrote:

Nigel Wade wrote:

You simply read it back in the way it was written out:

FileInputStream fis = new FileInputStream("t.tmp");
ObjectInputStream ois = new ObjectInputStream(fis);

try
{

Well, I was leaving such details as an exercise for the OP. I merely
intended to point them in the right direction, in line with the example
in the Javadocs.

But now you've brought it up, that try block should enclose the
FileInputStream/ObjectInputStream creation...

@SuppressWarnings( "unchecked" ) // matches what was written

ArrayList<String> dimensions = (ArrayList<String>) ois.readObject();

@SuppressWarnings( "unchecked" ) // matches what was written

ArrayList<String> colorpxl = (ArrayList<String>) ois.readObject();

  }
  catch ( ClassCastException exc )
  {
    // log and handle ...
  }

ois.close();

.... and you should also catch IOException (or each individual sub-class
that might get thrown if you really want to), and don't forget the
ClassNotFoundException.

--
Nigel Wade