New Object With Instance Variables

So far in my assignment I have successfully opened a text file. However I am required to do more:

1) As each line of text (containing names and ages) is read a new Runner object is created with its instance variables set thus: ! (Runner class already created )!

- name : set directly set from the value in the file
- agaGroup : can be worked out from the given ages:
< 18 should be 'junior'
> 55 should be 'senior'
the rest should be 'standard'

2) the instance of Runner should be added to the list referenced by the instance variable runners.

I have used if statements to create the junior list, however I do not see the full list of names and ages in the variable runners as I am requested to.

I am sure there is a for loop involved somewhere but I do not know how to:

a) use the for loop in my method
add a new Runner object with the variable mentioned.

I include the code I have done so far as a file - p.s I use Bluej.

public class MarathonAdmin
{
// instance variables
private String runners;
private String age;

[Code] ....