GO语言类型查询类型断言示例解析

var i []interface{}
i = append(i, 10, 3.14, "aaa", demo15)
for _, v := range i {
    if data, ok := v.(int); ok {
        fmt.Println("整型数据：", data)
    } else if data, ok := v.(float64); ok {
        fmt.Println("浮点型数据：", data)
    } else if data, ok := v.(string); ok {
        fmt.Println("字符串数据：", data)
    } else if data, ok := v.(func()); ok {
        //函数调用
        data()
    }
}

var i []interface{}
i = append(i, 10, 3.14, "aaa", demo15)
for _,data := range i{
    switch value:=data.(type) {
    case int:
        fmt.Println("整型",value)
    case float64:
        fmt.Println("浮点型",value)
    case string:
        fmt.Println("字符串",value)
    case func():
        fmt.Println("函数",value)
    }
}

package main
import "fmt"
type Student struct {
	name string
	id   int
}
func main() {
	i := make([]interface{}, 3)
	i[0] = 1                    //int
	i[1] = "hello go"           //string
	i[2] = Student{"mike", 666} //Student
	//类型查询，类型断言
	//第一个返回下标，第二个返回下标对应的值， data分别是i[0], i[1], i[2]
	for index, data := range i {
		//第一个返回的是值，第二个返回判断结果的真假
		if value, ok := data.(int); ok == true {
			fmt.Printf("x[%d] 类型为int, 内容为%d\n", index, value)
		} else if value, ok := data.(string); ok == true {
			fmt.Printf("x[%d] 类型为string, 内容为%s\n", index, value)
		} else if value, ok := data.(Student); ok == true {
			fmt.Printf("x[%d] 类型为Student, 内容为name = %s, id = %d\n", index, value.name, value.id)
		}
	}
}

package main
import "fmt"
type Student struct {
	name string
	id   int
}
func main() {
	i := make([]interface{}, 3)
	i[0] = 1                    //int
	i[1] = "hello go"           //string
	i[2] = Student{"mike", 666} //Student
	//类型查询，类型断言
	for index, data := range i {
		switch value := data.(type) {
		case int:
			fmt.Printf("x[%d] 类型为int, 内容为%d\n", index, value)
		case string:
			fmt.Printf("x[%d] 类型为string, 内容为%s\n", index, value)
		case Student:
			fmt.Printf("x[%d] 类型为Student, 内容为name = %s, id = %d\n", index, value.name, value.id)
		}

	}
}