Golang之struct

1.用来定义复杂数据结构

2.struct里面可以包含多个字段(属性)

3.struct类型可以定义方法,注意和函数的区分。

4.struct类型是值类型

5.struct类型可以嵌套

6.Go语言没有class类型,只有struct类型

package main

import "fmt"

//声明结构体
type Student struct {
    Name  string
    Age   int
    Score int
}

func main() {
    //struct字段访问,使用“点”访问
    var stu Student
    stu.Name = "yuchao"
    stu.Age = 18
    stu.Score = 99
    fmt.Printf("name=%s age=%d scrore=%d", stu.Name, stu.Age, stu.Score)
}

定义struct的三种形式:

package main

import "fmt"

//声明结构体
//字段名和函数名一样,首字母大写,在包外可以访问
type Student struct {
    Name  string
    Age   int
    Score float32
}

func main() {
    //struct字段访问,使用“点”访问
    var stu Student
    //var stu *Student = new(Student)
    //var stu *Student = &Student{ }
    stu.Name = "yuchao"
    stu.Age = 18
    stu.Score = 99
    //fmt.Println(stu) //默认结构 {yuchao 18 99.1}
    //fmt.Printf("name=%s age=%d scrore=%d", stu.Name, stu.Age, stu.Score)

    var stu1 *Student = &Student{
        Age:  20,
        Name: "chao",
    }

    var stu3 = Student{
        Age:  20,
        Name: "hua",
    }

    fmt.Println(stu1)
    fmt.Println(stu3.Name)
    fmt.Printf("Name:%p\n", &stu.Name)
    fmt.Printf("age:%p\n", &stu.Age)
    fmt.Printf("score:%p\n", &stu.Score)
}
定义结构体

 

var stu Student
var stu *Student = new(Student)
var stu *Student = &Student{ }

struct的内存布局,struct中的所有字段在内存是连续的,布局如下:

 

posted @ 2018-01-05 23:03  py鱼  阅读(304)  评论(0编辑  收藏  举报
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