golang继承，和多态

package main
type ST struct{
}
func (s *ST)Show(){
    println("ST")
}
func (s *ST)Show2(){
    println("ST:Show2()")
}
type ST2 struct{
    ST
    I int
}
func (s *ST2)Show(){
    println("ST2")
}
func main() {
    s := ST2{I:5}
    s.Show()
    s.Show2()
    println(s.I)
}