Jtextfield one=new Jtextfield("",3);
one.setName("one")
one.addFocusListener(this);


Jtextfield two=new Jtextfield("",4);
two.setName("two")
two.addFocusListener(this);

private void  focusLost(FocusEvent fe)
{
String name = ((Component)fe.getSource()).getName();
}