Go---fmt.Stringer内建接口

type Stringer interface {
  String() string
}
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type User struct {
  name  string
  age   int
  sex   string
}
// 实现接口
func (u *User) String() string {
  return fmt.Sprintf("name=%s,age=%d,sex=%s", u.name, u.age, u.sex)
}
func main() {
  u := &User{name: "张三", age: 18, sex: "男"}
  fmt.Println("fmt.Println(u):")
  fmt.Println(u)
  fmt.Println("fmt.Printf(\"%s\",u):")
  fmt.Printf("%s\n", u)
  fmt.Println("fmt.Printf(\"%v\", u):")
  fmt.Printf("%v\n", u)
}