为什么地图打印不正常,我该如何按顺序打印？
package main
import (
"fmt"
)
type monthsType struct {
no int
text string
}
var months = map[int]string{
1:"January",2:"Fabruary",3:"March",4:"April",5:"May",6:"June",7:"July",8:"August",9:"September",10:"October",11:"Novenber",12:"December",}
func main(){
for no,month := range months {
fmt.Print(no)
fmt.Println("-" + month)
}
}
打印出来：
10-October 7-July 1-January 9-September 4-April 5-May 2-Fabruary 12-December 11-Novenber 6-June 8-August 3-March
码：
func DemoSortMap() (int,error) {
fmt.Println("use an array to access items by number:")
am := [2]string{"jan","feb"}
for i,n := range am {
fmt.Printf("%2d: %s\n",i,n)
}
fmt.Println("maps are non-sorted:")
mm := map[int]string{2: "feb",1: "jan"}
for i,n := range mm {
fmt.Printf("%2d: %s\n",n)
}
fmt.Println("access items via sorted list of keys::")
si := make([]int,len(mm))
for i := range mm {
si = append(si,i)
}
sort.Ints(si)
for _,i := range si {
fmt.Printf("%2d: %s\n",mm[i])
}
return 0,nil
}
(其中大部分是从M. Summerfield的book中偷走的)
输出：
use an array to access items by number: 0: jan 1: feb maps are non-sorted: 2: feb 1: jan access items via sorted list of keys:: 1: jan 2: feb
