Groovy
Retrieve the first object (index [0]) among all objects attached to this page and class XWikiComments
com.xpn.xwiki.api.Object@5fba67a2
Retrieve all objects attached to this page and of class XWikiComments
[com.xpn.xwiki.api.Object@732aa36e, com.xpn.xwiki.api.Object@744fc5d3, com.xpn.xwiki.api.Object@2144db4d, com.xpn.xwiki.api.Object@2f99ad4b, com.xpn.xwiki.api.Object@12402f57, com.xpn.xwiki.api.Object@33e4021d, com.xpn.xwiki.api.Object@3e46d888, com.xpn.xwiki.api.Object@1d31e8a9, com.xpn.xwiki.api.Object@37a1be38]
Retrieve all objects attached to this page and of class XWikiComments and one of their properties
objsAuthors = doc.getObjects('XWiki.XWikiComments').author
objsAuthor = doc.getObjects('XWiki.XWikiComments')[2].author
println objs[0].author
println objsAuthors
println objsAuthor