go MethodByName()不能获取私有方法的解决_Golang

type obj interface {
	Do()
}
 
type objA struct {
	a []int
	b []int
	c int
}
 
var N int = 1000
 
func NewObjA() (o *objA) {
	o = &objA{}
	rand.Seed(time.Now().UnixNano())
	o.a = make([]int, N)
	o.b = make([]int, N)
	for i := 0; i < N; i++ {
		o.a[i] = rand.Intn(256)
		o.b[i] = rand.Intn(256)
	}
	return
}
 
func (o *objA) Do() {
	o.c = 0
	for i := range o.a {
		o.c += o.a[i] * o.b[i] % 256
	}
}
 
func (o *objA) do() {
	o.c = 0
	for i := range o.a {
		o.c += o.a[i] * o.b[i] % 256
	}
}
 
func (o *objA) Do2() int{
	o.c = 0
	for i := range o.a {
		o.c += o.a[i] * o.b[i] % 256
	}
	return o.c
}
 
 
 
func main() {
	a := obj(NewObjA())
 
	v:=reflect.ValueOf(a)
	if f1 := v.MethodByName("Do"); f1.IsValid() {
		f1.Call([]reflect.Value{})
		fmt.Println("成功执行 Do")
	}
	if f2 := v.MethodByName("do"); f2.IsValid() {
		f2.Call([]reflect.Value{})
		fmt.Println("成功执行 do")
	}
	if f2 := v.MethodByName("Do2"); f2.IsValid() {
		f2.Call([]reflect.Value{})
		fmt.Println("成功执行 Do2,结果 ")
	}
 
	fmt.Println("方法数量为：",v.NumMethod())
	for i:=0;i< v.NumMethod();i++{
		f:=v.Method(i)
		fmt.Println("方法",i,":",f.Type())
	}
 
}