Go Select 语句

package main



import "fmt"



func main() {

   var c1, c2, c3 chan int

   var i1, i2 int

   select {

      case i1 = <-c1:

         fmt.Printf("received ", i1, " from c1\n")

      case c2 <- i2:

         fmt.Printf("sent ", i2, " to c2\n")

      case i3, ok := (<-c3):  // same as: i3, ok := <-c3

         if ok {

            fmt.Printf("received ", i3, " from c3\n")

         } else {

            fmt.Printf("c3 is closed\n")

         }

      default:

         fmt.Printf("no communication\n")

   }    

}