Go语言学习四:struct类型

我们上面介绍了如何定义一个struct,定义的时候是字段名与其类型一一对应，实际上Go支持只提供类型，而不写字段名的方式，也就是匿名字段，也称为嵌入字段。

当匿名字段是一个struct的时候，那么这个struct所拥有的全部字段都被隐式地引入了当前定义的这个struct

// struct2.go
package main

import (
	"fmt"
)

type Human struct {
	name   string
	age    int
	weight int
}
type Student struct {
	Human      //匿名字段，那么默认struct就包含了Human所有字段
	speciality string
}

func main() {
	//初始化一个学生
	mark := Student{Human{"Mark", 25, 100}, "Computer Science"}

	//访问相应的字段
	fmt.Println("His name is ", mark.name)
	fmt.Println("His age is ", mark.age)
	fmt.Println("His weight is ", mark.weight)
	fmt.Println("His speciality is ", mark.speciality)

	//修改对应的信息
	mark.speciality = "AI"
	fmt.Println("Mark changed his speciality")
	fmt.Println("His speciality is ", mark.speciality)
	//  修改他的年龄信息
	fmt.Println("Mark become old")
	mark.age = 46
	fmt.Println("His age is", mark.age)
	//  修改他的体重信息
	fmt.Println("Mark is not an athlet anymore")
	mark.weight += 60
	fmt.Println("His weight is", mark.weight)
}

输出结果：

His name is  Mark
His age is  25
His weight is  100
His speciality is  Computer Science
Mark changed his speciality
His speciality is  AI
Mark become old
His age is 46
Mark is not an athlet anymore
His weight is 160