package main

import (

    "fmt"

    "math/rand"

)

func main() {

    ch := make(chan int)

    done := make(chan bool)

    f := make(chan bool)

    go func() {

        for {

            select {

            case ch <- rand.Intn(5):{

                fmt.Println("随机生成数字")

            }

            case <-f:

                {

                    fmt.Println(111)

                    return

                }

            default:

            }

        }

    }()

    go func() {

        for i := 0; i < 5; i++ {

            fmt.Println("Rand Number = ", <-ch) // Print number received on standard output

        }

        f <- true

        done <- true // Send Terminate Signal and return

        return

    }()

    <-done // Exit Main when Terminate Signal received

}