go 结构体

1. 定义结构体

package mainimport "fmt"type Person struct {age, id     intname, email string
}func main() {var p Personfmt.Printf("p: %v\n", p)p.age = 100p.name = "jaja"fmt.Printf("p.name: %v\n", p.name)// 匿名结构体var Pp struct {age, id     intname, email string}Pp.age = 100fmt.Printf("Pp.age: %v\n", Pp.age)
}

2. 结构体初始化

未被初始化的结构体string类型默认为nil,int类型默认为0,bool类型默认为false

package mainimport "fmt"type Person struct {age, id     intname, email string
}func main() {var p Personfmt.Printf("p: %v\n", p)fmt.Printf("p.name: %v\n", p.name)// 使用键值对初始化p = Person{name: "haha"}fmt.Printf("p.name: %v\n", p.name)//使用顺序初始化,所有的键必须赋值p = Person{1, 1, "haha", "haha"}fmt.Printf("p: %v\n", p)
}

3. 结构体指针

package mainimport "fmt"type Person struct {name, email string
}func main() {var p_person Person = Person{name:  "tom",email: "[e-mail]",}var p *Personp = &p_personfmt.Printf("p: %v\n", p)fmt.Printf("p.name: %v\n", p.name)p.email = "haha"fmt.Printf("p_person: %v\n", p_person)fmt.Printf("p: %v\n", p)}
、、使用new关键字创建一个指针
package mainimport "fmt"type Person struct {name, email string
}func main() {p_person := new(Person)p_person.email = "haha"fmt.Printf("p_person: %v\n", p_person)}

4. 结构体当成函数参数

package mainimport "fmt"type Person struct {name, email string
}//值传递结构体
func showInfo(person Person) {person.email = "[e-mail]"person.name = "dalian"fmt.Printf("person: %v\n", person)
}func structShow(person *Person) {person.email = "[e-mail]"person.name = "dalian"fmt.Printf("person: %v\n", person)
}func main() {var p_person Person = Person{name:  "tom",email: "[e-mail]",}fmt.Printf("p_person: %v\n", p_person)showInfo(p_person)fmt.Printf("p_person: %v\n", p_person)structShow(&p_person)fmt.Printf("p_person: %v\n", p_person)}