Java -call order?

[abraxas334]

I am a bit confused as to what gets called when:
I have a class called FrameDataIterator:


class FrameDataIterator implements Iterator<IVector>
{
// current trajectory index
private int itraj = -1;
// current frame in reader
private int iframe = -1;
// current reader
private ITrajectoryReader currentReader; //= inputFiles.get(0);

public FrameDataIterator()
{
openNextReader();
//try
//{
//currentReader.open();
//} catch (IOException e)
//{
// throw (new RuntimeException("IOException during Trajectory iteration: " + e));
//}
}

private void openNextReader()
{

currentReader = inputFiles.get(itraj + 1);
System.out.println("In Sequential Trajectory reader, opening the next reader............"+currentReader.getFileName());
try
{
currentReader.open();
}
catch (IOException e)
{
throw (new RuntimeException("IOException during Trajectory iteration: " + e));
}
}
}[
and I want to get an iterable over this Iterator. I define somthing like this



public Iterable<IVector> getFrameDataIterable()
{
class FrameDataIterable implements Iterable<IVector>
{



@Override
public Iterator<IVector> iterator()
{
return (getFrameDataIterator());
}
}

return (new FrameDataIterable());
}

Though this does not call the getFramDatatIterator method and thus does not open my file. How can i get an iterable, where the OpenNextReader() method gets called every time I request a new iterable? Would it be correct to give the FrameDataIterable class a constructor and in this constructor call iterator()?

Thanks for the help?