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
