go 的chan01

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package main

import (
	"fmt"
	"time"
)

func write(ch chan int) {
	for i := 0; i < 5; i++ {
		ch <- i
		fmt.Println("successfully wrote", i, "to ch")
	}
	fmt.Println("关闭ch")
	close(ch)
}

func test2(){
	ch := make(chan string, 3)
	var s string
	ch <- "hello"
	ch <- "world"
	ch <- "!"
	//ch <- "test"
	s = <-ch
	s1 := <-ch
	s2 := <-ch
	fmt.Println(s, s1, s2)
}


func main() {
	ch := make(chan int, 2)
	//ch := make(chan int)
	go write(ch)
	//write(ch)
	time.Sleep(50 * time.Second)
	for v := range ch {  // range会重复从ch中获取数据,直到他自动关闭
		fmt.Println("read value", v, "from ch")
		time.Sleep(1 * time.Second)
	}
	test2()
}