Go 语言中的空接口(推荐)

type empty_iface interface {
}

package main

import (
	"fmt"
)

func main() {
	var i interface{}
	fmt.Printf("type: %T, value: %v", i, i)
}

package main

import (
	"fmt"
)

func main() {
	// 声明一个空接口实例
	var i interface{}

	// 存 int 没有问题
	i = 1
	fmt.Println(i)

	// 存字符串也没有问题
	i = "hello"
	fmt.Println(i)

	// 存布尔值也没有问题
	i = false
	fmt.Println(i)
}

package main

import (
	"fmt"
)

func myfunc(iface interface{}){
	fmt.Println(iface)
}

func main() {
	a := 10
	b := "hello"
	c := true

	myfunc(a)
	myfunc(b)
	myfunc(c)
}

package main

import (
	"fmt"
)

func myfunc(ifaces ...interface{}){
	for _,iface := range ifaces{
		fmt.Println(iface)
	}
}

func main() {
	a := 10
	b := "hello"
	c := true

	myfunc(a, b, c)
}

package main

import "fmt"

func main() {
 any := make([]interface{}, 5)
 any[0] = 11
 any[1] = "hello world"
 any[2] = []int{11, 22, 33, 44}
 for _, value := range any {
 fmt.Println(value)
 }
}

package main

func main() {
	// 声明a变量, 类型int, 初始值为1
	var a int = 1

	// 声明i变量, 类型为interface{}, 初始值为a, 此时i的值变为1
	var i interface{} = a

	// 声明b变量, 尝试赋值i
	var b int = i
}

package main

import "fmt"

func main() {
	sli := []int{2, 3, 5, 7, 11, 13}

	var i interface{}
	i = sli

	g := i[1:3]
	fmt.Println(g)
}

package main

import (
	"fmt"
)

func myfunc(i interface{}) {

	switch i.(type) {
	case int:
		fmt.Println("参数的类型是 int")
	case string:
		fmt.Println("参数的类型是 string")
	}
}

func main() {
	a := 10
	b := "hello"
	myfunc(a)
	myfunc(b)
}