l <- list(name = "Geeksforgeeks", state = "UP", sector= 136) # Class name declared as 'info' class(l) <- "info" # Object creation of class 'info' l R Copy输出$name [1] "Geeksforgeeks" $state [1] "UP" $sector [1] 136 attr(, "class") [1] "info" R Copy例2 :...