Go (interface)介面二

這是一個建立於 的文章，其中的資訊可能已經有所發展或是發生改變。

// main project main.gopackage mainimport ("fmt")type Stringer interface {String() string}type intStr struct {i int}func (s *intStr) String() string {return fmt.Sprintf("%d", s.i)}func Print(s Stringer) {fmt.Println(s.String())}func DynamicPrint(any interface{}) {if s, ok := any.(Stringer); ok {Print(s)}}func main() {// 1var num intStrnum.i = 12345Print(&num)DynamicPrint(&num)//2num2 := &intStr{i: 10086}Print(num2)DynamicPrint(num2)//3var num3 Stringer = new(intStr)fmt.Println(num3.String())Print(num3)DynamicPrint(num3)//4var num4 *intStr = new(intStr)num4.i = 345Print(num4)DynamicPrint(num4)fmt.Println(num4.String())}

輸出:

12345123451008610086000345345345