question: public static Response executeAndWait ( Request request ) { List < Response > responses = executeBatchAndWait ( request ) ; if ( responses == null || responses . size ( ) != 1 ) { throw new FacebookException ( "invalid state: expected a single response" ) ; } return responses . get ( 0 ) ; }
target:  Executes a single request on the current thread and returns the response. <p/> This should only be used if you have transitioned off the UI thread.