Unchecked call: stack.push()

Hi,
When I compile my stack program I get an error saying unchecked call for the following line, where variable "s" is my stack, and tempno is a double I'm trying to push onto it:
s.push(tempno);
any ideas?

Stack s = new Stack();
obviously have
import java.util.Stack;
at the top. bit of a n00b at this kind of thing so not sure what this problem is at all!

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