GO (switch 与 type)

最新推荐文章于 2025-05-14 18:17:43 发布

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最新推荐文章于 2025-05-14 18:17:43 发布

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原文链接：https://my.oschina.net/tsh/blog/898967

本文通过一个Go语言示例程序展示了如何使用类型断言和类型切换来处理不同类型的元素集合。该程序创建了一个包含多种类型（整数、字符串、自定义结构体等）的列表，并通过switch语句遍历和打印每个元素的具体类型及值。

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为什么80%的码农都做不了架构师？>>>

// switch project main.go
package main

import (
	"fmt"
)

type Element interface{}
type List []Element

type Person struct {
	name string
	age  int
}

func (p *Person) String() string {
	return fmt.Sprintf("(name: %s - age: %d)\n", p.name, p.age)
}

func main() {
	list := make(List, 4)
	list[0] = 10086
	list[1] = "Hello, World!"
	list[2] = Person{name: "Dennis", age: 34}
	list[3] = &list[2]
	for index, element := range list {
		switch value := element.(type) {
		case int:
			fmt.Printf("list[%d] is an int and its value is %d\n", index, value)
		case string:
			fmt.Printf("list[%d] is a string and its value is %s\n", index, value)
		case Person:
			fmt.Printf("list[%d] is a Person and its value is %s\n", index, value.String())
		default:
			fmt.Printf("list[%d] is of a different type (%v)\n", index, value)
		}
	}
}

输出：

list[0] is an int and its value is 10086
list[1] is a string and its value is Hello, World!
list[2] is a Person and its value is (name: Dennis - age: 34)

list[3] is of a different type (0xc0420400e0)

转载于:https://my.oschina.net/tsh/blog/898967