How to show content only on the current slide in a Beamer specification?

Question

Here is a beamer frame that shows "Item 1" in the first slide, "Item 1 Item 2" in the second and only "Item 1 Item 3" in the third. How can I get the same result without having to count the items for \uncover<2>?

I tried changing it to \uncover<.>, but then "Item 2" never appeared.

\documentclass[pdf]{beamer}
\begin{document}
\begin{frame}{Introduction}
    \begin{itemize}
        \item Item 1
        \pause
        \uncover<2>{\item Item 2}
        \pause
        \item Item 3
    \end{itemize}
\end{frame}
\end{document}

Answer 1

The . syntax is out by one when not used with the default overlay specification in a list (see How do I get the right number of pauses after a list in beamer? for where I encountered something a bit similar).

\documentclass[pdf]{beamer}
\begin{document}
\begin{frame}{Introduction}
    \begin{itemize}
        \item Item 1
        \pause
        \uncover<.(1)>{\item Item 2}
        \pause
        \item Item 3
    \end{itemize}
\end{frame}
\end{document}

Answer 2

\documentclass[pdf]{beamer}
\begin{document}
\begin{frame}{Introduction}
    \begin{itemize}
        \item<1-2> Item 1
        \item<2> Item 2
        \item<3> Item 3
    \end{itemize}
\end{frame}
\end{document}