golang面向接口

我不是女神ヾ 2023-07-10 08:15 19阅读 0赞

> go语言是一门面向接口的编程语言

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NvY2t0YWlsX3B5_size_16_color_FFFFFF_t_70]

##### 1.接口的定义和实现 #####

![工程目录][20200301201627787.png]

###### 1.1接口定义 ######

接口是一个或多个方法的集合

/* @FileName: main.go @Time : 2020/3/1 20:08 @Author : Cocktail_py */
    package main
    
    import (
    	"awesomeProject/dbinterface/mysql"
    	"fmt"
    )
    
    //定义一个数据库接口 具有读写功能
    type Database interface { 
    	Read() map[string]string
    	Write(form map[string]string) string
    }
    
    func main() { 
    	var db Database
    	db = &mysql.Database{ }
    	//fmt.Println(db)
    	fmt.Println(db.Read())
    	db.Write(map[string]string{ "name": "Cocktail_py", "course": "golang"})
    	fmt.Println(db.Read())
    }

###### 1.2接口实现 ######

接口的实现是隐式的  
只要实现接口里的方法

/* @FileName: database.go @Time : 2020/3/1 20:08 @Author : Cocktail_py */
    package mysql
    
    type Database struct { 
    	Content map[string]string
    }
    
    //实现Read功能
    func (db *Database) Read() map[string]string { 
    	return db.Content
    }
    
    //实现Write功能
    func (db *Database) Write(form map[string]string) string { 
    	db.Content = form
    	return "ok"
    }

##### 2.接口的值类型 #####

interface\{\} 支持任何类型  
接口变量包含:实现者的类型,实现者的值

/* @FileName: queue3.go @Time : 2020/3/1 21:08 @Author : Cocktail_py */
    package queue3
    
    //interface{} 支持任何类型
    type Queue []interface{ }
    
    func (q *Queue)Push(v interface{ })  { 
    	*q= append(*q,v)
    }
    
    func (q *Queue)Pop()interface{ }  { 
    	head := (*q)[0]
    	*q = (*q)[1:]
    
    	//Type Switch
    	//接口变量包含:实现者的类型,实现者的值
    	switch head.(type) { 
    	case int:
    		return head.(int)
    	case string:
    		return head.(string)
    	default:
    		panic("Not correct value")
    	}
    	return head
    }
    
    func (q * Queue) IsEmpty() bool { 
    	return len(*q) == 0
    }

##### 3.接口的组合 #####

![在这里插入图片描述][20200301220302791.png]

/* @FileName: main.go @Time : 2020/3/1 20:08 @Author : Cocktail_py */
    package main
    
    import (
    	"awesomeProject/dbinterface/dbqueue"
    )
    
    //定义一个Database接口
    type Database interface { 
    	Read() map[string]string
    	Write(form map[string]string) string
    }
    
    //定义一个Database接口
    type Queue interface { 
    	Pop() int
    	Push(int)
    }
    
    //DBQueue为Database接口与Database接口的组合
    type DBQueue interface { 
    	Database
    	Queue
    }
    
    func getValue(dbq DBQueue)  { 
    	dbq.Read()
    }
    
    func main() { 
    	db := &dbqueue.DbQueue{ }
    	getValue(db)
    }

实现dbqueue所有功能

/* @FileName: dbqueue.go @Time : 2020/3/1 20:08 @Author : Cocktail_py */
    package dbqueue
    
    type DbQueue struct { 
    	Content map[string]string
    }
    
    func (d DbQueue) Read() map[string]string { 
    	panic("implement me")
    }
    
    func (d DbQueue) Write(form map[string]string) string { 
    	panic("implement me")
    }
    
    func (d DbQueue) Pop() int { 
    	panic("implement me")
    }
    
    func (d DbQueue) Push(int) { 
    	panic("implement me")
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NvY2t0YWlsX3B5_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200301082354109.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NvY2t0YWlsX3B5,size_16,color_FFFFFF,t_70
[20200301201627787.png]: https://img-blog.csdnimg.cn/20200301201627787.png
[20200301220302791.png]: https://img-blog.csdnimg.cn/20200301220302791.png