Hi Swetha appreciate ur answer,Can you post a complete working example so that
it is useful for further reference
Sent from my Nokia phone
-----Original Message-----
From: Swetha
Sent: 20/02/2011, 01:04
To: mihai.di...@free.fr
Cc: asdk...@gmail.com; javaprogrammingwithpassion@googlegroups.com
Subject: Re: [java programming] Java Collections List : Converting from List
'<Column <String1, String2>>' to 'List <String1>'
Hi
I just did this in my project.
The simplest way is have an object Record. In that have ArrayList<Entry>
Entry has 2 fields columns and values.
Now, db wil return ArrayList<Record>.
Say UI would pass ArrayList<columns>, loop through this ArrayList and set the
entries and record and return the ArrayList of records back to ui for display
Hope this helps
Sent from my iPhone
On Feb 19, 2011, at 6:19 AM, Mihai DINCA <mihai.di...@free.fr> wrote:
> Hi
>
> The straight right way to do it is to create your own List, like :
> List<String> oneColumnList = new LinkedList<String>();
>
> The populate it with the things you need from the first List, something like
> this (I don't know the names of the methods in the Column class, and I dont't
> think the "for each" construct will work, but you've got the idea) :
> for ( Column c : myFirstList ) {
> oneColumnList.add( c.getFirstColumn());
> }
>
> Then call the 2nd function with the newly constructed list.
>
> Of course, this is a silly way to do it, specially when the number of columns
> is important. The alternative is to find a library function or some other
> solution to get directly a list of columns.
>
> Hope it helps
> Mihai
>
> Le 19/02/2011 13:04, asil klin a écrit :
>>
>> I have a function that returns a list like this:-
>>
>> List <Column <String1, String2>>
>>
>> Next I want to pass this list to a 2nd function, but 2nd function just needs
>> a list which contains only 1st part (string1) of the Column(s) of the above
>> list.
>>
>> So I want pass just this list to 2nd function:-
>>
>> List <String1>
>>
>> What would be the best way to do this ??
>>
>> [my use case: Both the functions are from a library that I use
>> to access database(Cassandra) for a web application. 1st function gives me a
>> list of all columns which has two parts name(String1) and value(String2). So
>> 1st function gives me a list of all columns(each of which has two strings)
>> then I just need to use the list of column names to supply it to 2nd
>> function that'll query the DB for those columns.]
>>
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