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Newsgroups: comp.lang.java.programmer
Date: Tue, 2 Apr 2013 10:46:12 -0700 (PDT)
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Subject: Re: Inserting In a List
From: Lew <lewbloch@gmail.com>
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Xref: csiph.com comp.lang.java.programmer:23186

subhaba...@gmail.com wrote:
> I am taking out the files in my desktop folder, as,

"Taking out" I understood initially as "deleting", but I gather you mean "printing" or 
"displaying".


> File folder = new File("C:\\Users\\subhabrata\\Desktop");

You can also use forward slashes.

> Next, I am trying to take them out one by one as using for loop and name
> of each file is converted to String, 

If you indented properly your scope issues would be easier to see. The first block 
doesn't have any, but the one further down does.

> for( File name :folder.listFiles()){
>     String s1=name.toString(); 
>     System.out.println("####"+s1);
>     System.out.print( name );
> }

I should think you'd use 'getPath()' or 'getName()' on the 'name' instance.

> Till this there is no issue, now I am trying to insert name of all the files
> in an array, generally it can be done, as,

> ArrayList<String> myList = new ArrayList<String>();

That is not an array, that is a 'List'.

>         myList.add(s1);

> But the problem I am facing is, if I put it as,

Again, proper indentation would reveal any scope issues.

> for( File name :folder.listFiles()){
>     String s1=name.toString(); 
>     System.out.println("####"+s1);
>     System.out.print( name );
>     ArrayList<String> myList = new ArrayList<String>();
>     myList.add(s1);
> }

Now here you have a scope issue. You create a new 'List' in each iteration, add only 
one item to it, then throw it away. Nowhere do you create a 'List' that survives one 
loop iteration.

> I am getting name of files individually but I want to see them as the whole bunch like,

You show no code that demonstrates how you determine what "you" are "getting".

Please follow 
http://sscce.org/

> myList=["string1","string2","string3",...."StringN"]

In that case, declare your 'List' in a scope that survives the loop.

> My aim is to check the names then in another for loop and if match
> is not found with some defined name update the list.

Study "scope" and "access" in Java.

> I am slightly new in Java so if anyone can kindly suggest how I should address it.

What is "slightly"?

-- 
Lew