Struct and Interface in Go_2.go

type Human struct {
    name string
}

type Student struct {
    Human
    job string
}

type Worker struct {
    Human
    job string
    salary int 
}

func (h Human) Info() {
    fmt.Printf("I am %s\n", h.name)
}

func (s Student) Info () {
    fmt.Printf("I am %s. I am a %s.\n", s.name, s.job)
}
func (w Worker) Info () {
    fmt.Printf("I am %s. I am a %s. I have %d salary\n", w.name, w.job, w.salary)
}

type Person interface {
    Info()
}
func main() {
    Tom := Student{Human{"Tom"}, "student"}
    Ben := Worker{Human{"Ben"}, "worker", 1000}
    Susan := Human{"Susan"}

    Tom.Info()
    Ben.Info()
    Susan.Info()

    var i Person

    // Becaus Student and Worker and Human all have implemented Info method
    i = Tom
    i.Info()

    i = Ben
    i.Info()

    i = Susan
    i.Info()
}