Go 语言中的空接口（Let's Go 二十七）

package main

import (
    "fmt"
)

func main() {

    var any interface{}

    any = 4
    fmt.Printf("any 值为 %d ,类型为 %T \n", any, any)

    any = "https://qiucode.cn"
    fmt.Printf("any 值为 %d ,类型为 %T \n", any, any)

}

package main

import (
    "fmt"
)

type Flyer interface {
    Fly()
}

type Walker interface {
    Walk()
}
type Bird struct{}

func (b *Bird) Fly() {
    fmt.Println("fling....")
}

func (b *Bird) Walk() {
    fmt.Println("Walking ....")
}

type Peple struct{}

func (p *Peple) Walk() {
    fmt.Println(" peple walk ...")
}

func main() {

    animals := map[string]interface{}{
        "bird":  new(Bird),
        "peple": new(Peple),
    }
    // 遍历映射
    for name, obj := range animals {
        f, isFlyer := obj.(Flyer)
        w, isWalker := obj.(Walker)
        fmt.Printf("name: %s isFlyer: %v isWalker: %v\n", name, isFlyer, isWalker)
        if isFlyer {
            f.Fly()
        }
        if isWalker {
            w.Walk()
        }
    }

}