027_go语言中的通道选择器

Posted 2020-10-30 乱七八糟的博客

代码演示

package main

import "fmt"
import "time"

func main() {
	c1 := make(chan string)
	c2 := make(chan string)
	go func() {
		time.Sleep(time.Second * 1)
		c1 <- "one"
	}()
	go func() {
		time.Sleep(time.Second * 2)
		c2 <- "two"
	}()
	for i := 0; i < 2; i++ {
		select {
		case msg1 := <-c1:
			fmt.Println("received", msg1)
		case msg2 := <-c2:
			fmt.Println("received", msg2)
		}
	}
}

　　

代码运行结果

received one
received two

　　

代码解读

• go语言的通道选择器(select)可以同时等待多个通道操作

• 以上例子就是利用关键字select同时等待创建的两个通道的值

• 对于select语句而言，它会不断的检测通道是否有值传过来，一旦发现传过来，立刻获取并输出