Go Builder mode, create classrooms and dormitories

Direct code:

ackage mainimport  "FMT"//now has classrooms and dormitories, classrooms two fans, Windows two meters high,  dormitory a door, windows tall rice type room struct {     doorNum      int      windowheight int }func  (R *room)  showroominfo ()  {    fmt. Println ("Door num:", r.doornum,  "Door windowheight:",  r.windowheight)}type  Roombuilder interface {    build ()  *room}func buildroom (builder  Roombuilder)  *room {    return builder.build ()}type ClassRoomBuilder  struct {}func  (*classroombuilder)  build ()  *room {    return  &Room{2, 2}}type DormitoryBuilder struct {}func  (*dormitorybuilder)   Build ()  *room {    return &room{1, 1}}func main ()  {     room := Buildroom (&classroombuilder{})     room.showroominfo ()     room  = buildroom (&dormitorybuilder{})     room.showroominfo ()      //the same thing we need a living room a door without windows, you can write a living room builder    //The example here is simple, while the actual build function can handle complex things, The builder mode allows you to separate specific     //instances from the creation process, so that you can easily extend and replace the creation process}

Go Builder mode, create classrooms and dormitories