Groovy
Retrieve the first object (index [0]) among all objects attached to this page and class XWikiComments
com.xpn.xwiki.api.Object@3d881661
Retrieve all objects attached to this page and of class XWikiComments
[com.xpn.xwiki.api.Object@232ad63d, com.xpn.xwiki.api.Object@515750d4, com.xpn.xwiki.api.Object@3b7bb804, com.xpn.xwiki.api.Object@376e2d1e, com.xpn.xwiki.api.Object@22542900, com.xpn.xwiki.api.Object@434fd09b, com.xpn.xwiki.api.Object@2d0892a3, com.xpn.xwiki.api.Object@dd3226e, com.xpn.xwiki.api.Object@20796ad9]
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