Remove page from Google Listings using robots.txt file

Is this the correct way to do this - below is my txt file, would this prevent Google from indexing my admin d开发者_JS百科irectory as well as oldpage.php?

User-agent: *
Allow: /
Disallow: /admin/
Disallow: http://www.mysite.com/oldpage.php

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Yes you are absolutely correct except single file restriction.

User-agent: * : means for all crawler

Allow: / : allow access of full site

Disallow: /admin/ : restrict to admin directory

Disallow: /oldpage.php : restrict to oldpage.php