Go中的"继承"之struct的匿名字段2

Posted 2021-01-10

// code_016_struct_anonymous_field2 project main.go
package main

import (
    "fmt"
)

type Person struct {
    name string
    sex  byte
    age  int
}

type Student struct {
    Person
    id   int
    addr string
    name string //同名字段
}

type mystr string //自定义类型

type Student01 struct {
    Person
    int
    mystr
}

type Person02 struct {
    name string
    sex  byte
    age  int
}

type Student02 struct {
    *Person02 //匿名字段，结构体指针
    id        int
    addr      string
}

func main() {
    //1）同名字段的使用
    var s Student
    s.name = "ck_god" //默认给最外层的成员赋值
    fmt.Printf("%+v
", s)

    s.Person.name = "god_girl" //显示调用
    fmt.Printf("%+v
", s)

    //2) 其他匿名字段
    s1 := Student01{Person{"ck_god", 1, 18}, 1, "wz"}
    fmt.Printf("%+v
", s1)

    //非结构体类型的匿名成员的操作
    fmt.Printf("%s,%c,%d,%d,%s
",
        s1.name, s1.sex, s1.age, s1.int, s1.mystr)

    //3)结构体指针类型
    s3 := Student02{&Person02{"ck_god", 0, 18}, 1, "bj"}
    fmt.Printf("%+v
", s3)
    fmt.Printf("%s,%c,%d
", s3.name, s3.sex, s3.age)

    var s2 Student02
    s2.Person02 = new(Person02) //分配空间
    s2.name = "ck"
    s2.sex = 1
    s2.age = 20

    s2.id = 2
    s2.addr = "sz"

    fmt.Println(s2.name, s2.sex, s2.age, s2.id, s2.age)
}

输出结果如下：

{Person:{name: sex:0 age:0} id:0 addr: name:ck_god}
{Person:{name:god_girl sex:0 age:0} id:0 addr: name:ck_god}
{Person:{name:ck_god sex:1 age:18} int:1 mystr:wz}
ck_god,
,18,1,wz
{Person02:0xc000004480 id:1 addr:bj}
ck_god,,18
ck 1 20 2  20