Java Help - About cast

Author

About cast

Jordi

2005-11-07, 10:03 pm

Hi.

I've created a class called TokenizedFile as follows (simplified version
;-))

public class TokenizedFile
{
private String FileName;

TokenizedFile(String FileName)
{
this.FileName = FileName;
... some other things ...
}

public String getFileName()
{
return this.FileName;
}
}

Then, in the main code, I have an ArrayList of TokenizedFiles as follows:

ArrayList aL = new ArrayList();
TokenizedFile tf1, tf2, ... tfN;

aL.add(tf1);
aL.add(tf2);
....
aL.add(tfN);

Now, I would like to be able to print all the filenames. So, I tried to
do the next:

System.out.println(aL.get(0).getFileName());

But it does not work :-( I tried to do some cast as follows:

System.out.println(aL.get(0).(TokenizedFile)getFileName());

or

System.out.println(aL.get(0)(TokenizedFile).getFileName());

but they do not work. Does somebody know which is the right way to use
cast there?

Thank you.

Jordi.

klynn47@comcast.net

2005-11-07, 10:03 pm

Try this.

System.out.println(((TokenizedFile)aL.get(0)).getFileName());

Jordi

2005-11-07, 10:03 pm

It worked perfectly. Thank you very much ;-)

Jordi.

klynn47@comcast.net wrote:
> Try this.
>
> System.out.println(((TokenizedFile)aL.get(0)).getFileName());
>

Bjorn Abelli

2005-11-07, 10:03 pm

> klynn47@comcast.net wrote:
[color=darkred]

If all the OP wants is to print the "FileNames", he could also just add the
method toString() to his class:

public class TokenizedFile
{
private String FileName;

TokenizedFile(String FileName)
{
this.FileName = FileName;
... some other things ...
}

public String getFileName()
{
return this.FileName;
}

public String toString()
{
return this.FileName;
}
}

....and then he could print it like this:

System.out.println( aL.get(0) );

;-)

// Bjorn A

Roedy Green

2005-11-07, 10:03 pm

On Sat, 05 Nov 2005 19:32:32 +0100, Jordi
<despertaferro@gmail.NOSPAM.com> wrote, quoted or indirectly quoted
someone who said :

>Then, in the main code, I have an ArrayList of TokenizedFiles as follows:
>
>ArrayList aL = new ArrayList();
>TokenizedFile tf1, tf2, ... tfN;
>
>aL.add(tf1);
>aL.add(tf2);
>...
>aL.add(tfN);
>
>Now, I would like to be able to print all the filenames. So, I tried to
>do the next:

If by "main code" you mean the static main method, your tokenized file
name is not available there.

I presume what you mean here is not that you wrote this as Java code,
but that you wished for a feature to get you the effect of adding
multiple files or TokenizedFiles
You might simply add each filename you get in the constructor into a:
static ArrayList<Tokenized> allFiles = new
ArrayList<TokenizedFile>(20);
with:
allFiles. add( this );

Then you don't need any sort of 1 2 3 .. numbering.

--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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