How do you sort vector descendingly?

Question

Lets say if have a vector which contains values in double data type.
Vector vNum = ne wVector();
vNum.addElement(new Double("50.5"));
vNum.addElement(new Double("40.5"));
vNum.addElement(new Double("60.5"));_______________________________________
If you sort it ascendingly by entering the code:
Collections.sort(vNum);The result would be
40.5
50.5
60.5
and it is correct. But i tried to sort it descendingly by entering the code:
Collections.reverse(vNum);The result was:
60.5
40.5
50.5
Someone told me before that the code for sorting descendingly was Collections.reverse(vectorName); but it didnot work.
Does anyone know what's the code for sorting the Vector descendingly?
thanks!

Answer 1

Collections.reverse(list) just reverses the order of the elements in the specified list.
You can either call sort() and then reverse(), or you can specify your own Comparator for sorting in reverse order. (I prefer the second solution)
http://java.sun.com/j2se/1.4.2/docs/api/java/util/Collections.html#sort(java.util.List,%20java.util.Comparator)