Google cloud datastore runquery get a single entity

Google cloud datastore runquery get a single entity

I'm using java. This my code
RunQueryResponse response = dataset.runQuery("project_name",
queryrequest).execute();
and response.tostring(). I have all the query I want but there many. How
to get a single entity and value. Like put it in an array or something we
can call with for loop or interator. Thanks