How do I access data from another class?

Question

I have a class RailNetwork which extends Datastore. DataStore contains a vector filelines which I need to access from RailNetwork. How do I do this? What do I put infront of filelines.get(i); ?
public abstract class DataStore
{    Vector<String> fileLines = new Vector<String>(); }
public class RailNetwork extends DataStore
{    ...main(){ .......filelines.get(i);....... }
}

Answer 1

This is the code from RailNetwork class:
public static void main(String[] args) {
          String templine;
          int i = 0;
          int vectorlength = super.filelines.size();
          for( i = 0 ; i < vectorlength ; i++ )
               templine = (String) super.filelines.get(i);
               setStations(templine);  }The errors (for both lines, only 1 shown):
RailNetwork.java:49: non-static variable super cannot be referenced from a static context
                        templine = (String) super.filelines.get(i);
                                            ^
RailNetwork.java:49: cannot find symbol
symbol  : variable filelines
location: class DataStore
                        templine = (String) super.filelines.get(i);
                                                 ^