Groovy
Retrieve the first object (index [0]) among all objects attached to this page and class XWikiComments
com.xpn.xwiki.api.Object@544cfe4b
Retrieve all objects attached to this page and of class XWikiComments
[com.xpn.xwiki.api.Object@78c9c5ee, com.xpn.xwiki.api.Object@6e1ca36, com.xpn.xwiki.api.Object@51a2a2c1, com.xpn.xwiki.api.Object@c6b56c6, com.xpn.xwiki.api.Object@5b0de788, com.xpn.xwiki.api.Object@6ddbc06b, com.xpn.xwiki.api.Object@7635e925, com.xpn.xwiki.api.Object@4d5db8c4, com.xpn.xwiki.api.Object@440d738a]
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