package main

import "fmt"

func main() {
    // 声明Map
    var m1 map[int]string
    // 初始化空间
    m1 = make(map[int]string, 3)
    m1[1] = "one"
    m1[2] = "two"
    m1[3] = "three"

    fmt.Println(m1)
    fmt.Println(m1[1])
}

package main

import (
    "fmt"
    "math/rand"
    "sort"
    "time"
)

func main() {
    // 初始化随机数种子
    rand.Seed(time.Now().UnixNano())
    var scoreMap = make(map[string]int, 200)

    for i := 0; i < 100; i++ {
        key := fmt.Sprintf("stu%02d", i)
        value := rand.Intn(100)
        scoreMap[key] = value
    }
    var keys = make([]string, 0, 200)
    for key := range scoreMap {
        keys = append(keys, key)
    }
    // 对切片排序
    sort.Strings(keys)
    for _, key := range keys {
        fmt.Println(key, scoreMap[key])
    }
}