package main

import (
. "fmt" //打印使用包
"reflect" //反射使用包
"strconv" //转化为字符串使用包
)

type Element interface{}
type List []Element
type Person struct {
name string
age int
}

//打印
func (p Person) String() string {
return "(姓名: " + p.name + " ,年龄: " + strconv.Itoa(p.age) + ")"
}
func main() {
//根据类型获得值
list := make(List, 3)
list[0] = 1 //an int
list[1] = "Hello" //a string
list[2] = Person{"Dennis", 70}
for index, element := range list {
switch value := element.(type) {
case int:
Println("下标", index, "int类型的值为:", value)
case string:
Println("下标", index, "string类型的值为：", value)
case Person:
Println("下标", index, "person类型的置为:", value)
default:
Println("默认值：", index)
}
}

//反射
var x float64 = 3.4
v := reflect.ValueOf(x)
Println("类型:", v.Type())
Println("类型是否为float64:", v.Kind() == reflect.Float64)
Println("值为:", v.Float())
k := reflect.ValueOf(x)
Println("值为:", k)
//修改值
p := reflect.ValueOf(&x) //反射得到值
j := p.Elem()            //得到元素值
Println("值为:", j)
j.SetFloat(7.1) //设置修改元素的值
Println("值为:", j)

}