// 先声明map
var m1 map[string]string
// 再使用make函数创建一个非nil的map，nil map不能赋值
m1 = make(map[string]string)
// 最后给已声明的map赋值
m1["a"] = "aa"
m1["b"] = "bb"
// 直接创建
m2 := make(map[string]string)
// 然后赋值
m2["a"] = "aa"
m2["b"] = "bb"
// 初始化 + 赋值一体化
m3 := map[string]string{
"a": "aa",
"b": "bb",
}
// ==========================================
// 查找键值是否存在
if v, ok := m1["a"]; ok {
fmt.Println(v)
} else {
fmt.Println("Key Not Found")
}
// 遍历map
for k, v := range m1 {
fmt.Println(k, v)
}
```go
package user
import (
"strconv"
)
type User struct {
name string
age int
sex string
phone string
}
func (s *User) SetName(name string) {
s.name = name
}
func (s *User) GetName() string {
return s.name
}
func (s *User) SetAge(age int) {
s.age = age
}
func (s *User) GetAge() int {
return s.age
}
func (s *User) String() string {
return "name is " + s.name + ",age is " + strconv.Itoa(s.age) + " ,sex=" + s.sex + " ,phone=" + s.phone
}
func (s *User) SetSex(sex string) {
s.sex = sex
}
func (s *User) GetSex() string {
return s.sex
}
func (s *User) SetPhone(phone string) {
s.phone = phone
}
func (s *User) GetPhone() string {
return s.phone
}
func (User) Print() string {
return "print"
}
```
#4
