package main
import "fmt"
type IMessage interface {
Print()
}
type BaseMessage struct {
msg string
}
func (message *BaseMessage) Print() {
fmt.Println("baseMessage:msg", message.msg)
}
type SubMessage struct {
BaseMessage
}
func (message *SubMessage) Print() {
fmt.Println("subMessage:msg", message.msg)
}
func interface_use(i IMessage) {
i.Print()
}
func main() {
//var message IMessage
//if message == nil {
// fmt.Println("IMessage is nil")
//}
baseMessage := new(BaseMessage)
baseMessage.msg = "a"
interface_use(baseMessage)
SubMessage := new(SubMessage)
SubMessage.msg = "b"
interface_use(SubMessage)
}
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