golang学习笔记struct-继承_go语言继承其他package中的struct

太忙，太累，不啰嗦，干起来

golang继承没有关键字，直接内置需要继承的类型，非常类似组合，但是没有属性名

package main

import (
	"fmt"
)

//Animal animal
type Animal struct {
	Name string
	Age  byte
}

//Cat cat
type Cat struct {
	//直接内置需要继承的类型 无属性名 注意与组合的区别
	Animal
	Sound string
}

func main() {
	//创建
	//方式一
	cat0 := Cat{}

	cat0.Animal.Name = "cat-0"
	cat0.Animal.Age = 2
	cat0.Sound = "mi-ao-"
	fmt.Println("cat0", cat0)

	//方式二
	cat1 := Cat{}
	cat1.Name = "cat-1"
	cat1.Age = 3
	cat1.Sound = "mi--"
	fmt.Println("cat1", cat1)

	//方式三
	animal := Animal{
		Name: "cat-2",
		Age:  10,
	}
	cat2 := Cat{
		Animal: animal,
		Sound:  "miao~",
	}
	fmt.Println("cat2", cat2)

	//方式四
	cat3 := Cat{
		Animal: Animal{
			Name: "cat-3",
			Age:  12,
		},
		Sound: "miao",
	}
	fmt.Println("cat3", cat3)

	//mixture of field:value and value initializers
	//嗯，来个反例，定义时属性要么属性名对应，要么顺序对应，不可混乱 mixture
	/*
		cat4 := Cat {
			Animal{
				Name: "cat",
				Age:  12,
			},
			Sound: "miao",
		}

	*/

}

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子类型与父类型有相同属性或方法时遵循就近原则

package main

import (
	"fmt"
)

//Animal animal
type Animal struct {
	Name string
	Age  byte
}

//Show show
func (a *Animal) Show() {
	fmt.Printf(" animal name = %v  age = %d \n", a.Name, a.Age)
}

//SayHi say
func (a *Animal) SayHi() {
	fmt.Printf(" hi, %v \n", a.Name)
}

//Cat cat
type Cat struct {
	Animal
	Name  string
	Sound string
}

//Show show
func (c *Cat) Show() {
	fmt.Printf("cat name = %v  age = %d  sound = %v \n", c.Name, c.Age, c.Sound)
}

//Biology 生物
type Biology struct {
	Name string
	Age  byte
}

//Dog dog
type Dog struct {
	Biology
	Animal

	Age   byte
	Sound string
}

func main() {
	cat := Cat{
		Animal: Animal{
			Name: "cat",
			Age:  3,
		},
		Sound: "mimiao",
	}
	//子结构体与父结构体 有同名属性时遵循就近原则
	fmt.Println(cat)
	cat.Show()
	cat.Animal.Show()
	cat.SayHi()
	fmt.Println("-------")

	cat.Name = "cat-0"
	cat.Show()
	cat.Animal.Show()
	fmt.Println("-------")

	cat.Animal.Name = "cat-1"
	cat.Show()
	cat.Animal.Show()
	cat.SayHi()

	//允许多重继承，但仍旧不推荐多重继承
	dog := Dog{}
	//多重继承时，继承的父类型存在同名字段且子类型无此同名属性时，必须指定父类型来定义对应属性
	// dog.Name = "dog"
	dog.Animal.Name = "animal-dog"
	dog.Biology.Name = "biology-dog"
	fmt.Println("dog", dog)
	//若多夫类型存在同名属性且子类型有次同名属性时，仍旧遵循就近原则
	dog.Age = 2
	fmt.Println("dog - ", dog)

}

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基本类型也可以继承

package main

import (
	"fmt"
	"go_code/test/model"
)

//SubInt sub
type SubInt struct {
	int
	subName string
}

//SubModel model
type SubModel struct {
	model.Model
	attribute string
}

func main() {
	//基本类型也可以被继承
	subint := SubInt{12, "sub"}
	fmt.Printf("subint type %T , int = %d, subName = %v \n", subint, subint.int, subint.subName)

	//被继承的父类属性或方法 对 子类型 无论首字母大小写均可见，但仍旧受包的可见限制
	subModel := SubModel{
		Model: model.Model{
			Name: "model",
		},
		attribute: "ok",
	}
	fmt.Println(subModel)

	amodel := model.AModel{}
	amodel.Show()
}

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package model

import "fmt"

//Model test
type Model struct {
	Name string
	size int
}

func (m *Model) printModel() string {
	return fmt.Sprintf("model name = %v , size = %d \n", m.Name, m.size)
}

type AModel struct {
	Model
	atrr string
}

func (a *AModel) Show() {
	fmt.Printf("amodel name = %v , size = %d, atrr = %v \n", a.Name, a.size, a.atrr)
}

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先这样吧