问[Golang]2 goroutine之间的通信

EN

package main

import "fmt"

func main() {
    ch := make(chan int)
    go producer(ch)
    go shower(ch)
    for i := 0; i < 10; i++ {
        fmt.Printf("main: %d\n", i)
    }
}
func shower(c chan int) {
    for {
        j := <-c
        fmt.Printf("worker: %d\n", j)
    }
}
func producer(c chan int) {
    for i := 0; i < 10; i++ {
        c <- i
    }
}