package main

import (
	"encoding/json"
	"fmt"
	"math/rand"
)

type Student struct {
	Name  string  `json:"name"`
	Age   int     `json:"age"`
	Score float32 `json:"score"`
}
type Cart struct {
	Name string
	Age  int
}
type Train struct { //匿名字段
	Cart
	int
}

func testNochar() { //匿名字段
	var t Train
	t.Name = "train"
	t.Age = 23
	t.int = 56
	fmt.Println(t)
}

//go里面通过匿名字段来继承
//方法也可以继承
type Car struct {
	Weight float32
	Name   string
}
type Bike struct {
	Car
	Tire int
}
type Train1 struct { //一个结构体放到另一个中，组合
	c Car
}

func (p *Car) Run() {
	fmt.Println("running")
}
func testGeneralization() {
	var b Bike
	b.Weight = 56.3
	b.Name = "sunshine"
	b.Tire = 2

	b.Run()

	fmt.Println(b)
}
func testCombination() {
	var t Train1
	t.c.Run()
}

type Train2 struct {
	c1 Car
	c2 Car
}

func testMutiGeneralization() {
	var T Train2
	T.c1.Name = "yang"
	T.c2.Weight = 56.6
	T.c1.Run()
	fmt.Println(T)
}
func testJson() {
	var stu Student = Student{
		Name:  "hu",
		Age:   23,
		Score: rand.Float32() * 100,
	}
	data, err := json.Marshal(stu)
	if err != nil {
		fmt.Println("encoding is error:", err)
	}
	fmt.Println(string(data))
}
func main() {
	// testJson()
	// testNochar()
	// testGeneralization()
	// testCombination()
	testMutiGeneralization()

}