1. package main
    3. import "fmt"
    5. func main()  {
    6.     //声明方式一：
    7.     var map1 map[string]string
    8.     if map1 == nil{
    9.         fmt.Println("map1是个空map")
    10.     }
    12.     map1 = make(map[string]string,4)
    13.     map1["one"] = "java"
    14.     map1["two"] = "python"
    15.     map1["three"] = "go"
    16.     fmt.Println(map1)
    18.     //声明方式二: := make() 不限制长度
    19.     map2 := make(map[int]string)
    20.     map2[1] = "java"
    21.     map2[2] = "python"
    22.     map2[3] = "go"
    23.     fmt.Println(map2)
    25.     //声明方式三：:= map{key:value,}，用于初始化
    26.     map3 := map[string]string{
    27.         "one":"java",
    28.         "two":"python",
    29.         "three":"go",
    30.     }
    31.     fmt.Println(map3)
    32. }
    1. package main
    3. import "fmt"
    5. func main()  {
    7.     ctiyMap := make(map[string]string)
    9.     //添加
    10.     ctiyMap["A"] = "a"
    11.     ctiyMap["B"] = "b"
    12.     ctiyMap["C"] = "c"
    14.     //遍历
    15.     printMap(ctiyMap)
    17.     //修改
    18.     ctiyMap["B"] = "d"
    19.     printMap(ctiyMap)
    21.     //删除
    22.     delete(ctiyMap,"C")
    23.     printMap(ctiyMap)
    24. }
    26. func printMap(ctiyMap map[string]string){
    27.     //引用传递
    28.     for key, value := range ctiyMap {
    29.         fmt.Println("key=",key,",value=",value)
    30.     }
    31. }