unchecked conversion warning.

This code compiles with an 'unchecked conversion' warning.
I have tried various corrections, for example casting like (Vector<Object>), but to no
avail.
What am I doing wrong?l
The code is the smallest demo I could make from the original application.

import java.util.Vector;
public class genericsdemo
{
private static Vector<Vector> vdata = new Vector<Vector>(); //a Vector of Vectors
private static Vector<Object> vrow = new Vector<Object>(); //a row

public static void main(String args[]) {
vrow.add(null); //two columns in the row
vrow.add(null);

vdata.add(vrow); //add the row to the Vector of Vectors

Vector vtmp = getrow(); //test
}

private static Vector<Object> getrow() {
return vdata.elementAt(0); //warning: [unchecked] unchecked conversion
}
}

JensJ
.

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