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Datatable record selection or data input

I have following scenerio in a vf page
The page uses standardController for Object A
                   Column - 1                    Column 2                Column 3
Record 1 - <Col 1 of the objectA>  < Input Check box> <an Input field whichis not an objectA column>
Record 2  <Col 1 of the object A> <Input Check box>    <an Input field which is not an object A column>
... and so on
And I have two command buttons <Save> <Cancel>
Now on <Save> , I want to check  which record is checked and get the value entered in Column 3 and call an class to process the data.
Any examples will be quite helpful.
Thanks in advance.