package main

import "fmt"

func main() {

    fmt.Println("Hello world!")

}

package main

import (

"fmt"

)

func main() {

    message := make(chan string)//定义一个string型的channel

    go func() {

        message <- "hello goroutine!"

    }()

    fmt.Println( <- message )

    fmt.Println("Hello world!")

}

package main

import (

    "fmt"

    "time"

)

func main() {

    message := make(chan string) //定义一个string型的channel

    go func() {

        message <- "hello goroutine!"

    }()

    go func() {

        time.Sleep( * time.Second)

        str := <-message

        str = str + "I'm goroutine!"

        message <- str

    }()

    time.Sleep( * time.Second)

    fmt.Println(<-message)

    fmt.Println("Hello world!")

}