Go (interface)接口二

// main project main.go
package main

import (
	"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() {

	// 1
	var num intStr
	num.i = 12345
	Print(&num)
	DynamicPrint(&num)
	
	//2
	num2 := &intStr{i: 10086}
	Print(num2)
	DynamicPrint(num2)

	//3
	var num3 Stringer = new(intStr)
	fmt.Println(num3.String())
	Print(num3)
	DynamicPrint(num3)
	
	//4
	var num4 *intStr = new(intStr)
	num4.i = 345
	Print(num4)
	DynamicPrint(num4)
	fmt.Println(num4.String())
}

输出:

12345
12345
10086
10086
0
0
0
345
345
345

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