package main

import "fmt"

type MyInterface interface {
	PrintSelf()
}

type MyInstance struct {
	MyInterface
}

func (ins *MyInstance) PrintSelf() {
	fmt.Println("i am inst")
}

func (ins *MyInstance) PrintSpecial() {
	fmt.Println("i am special")
}

//func MyFun(myInter MyInterface) {
//	myInter.(interface{ printSpecial() }).printSpecial()
//}

func main() {
	var Inf MyInterface = &MyInstance{}
	//
	Inf.PrintSelf()
	//父类调用子类方法
	Inf.(interface{ PrintSpecial() }).PrintSpecial()
}

2、输出