Golang基础学习(与java对比)

Golang基础

slice

slice := []int {lenth, 'b', 'c', 'd'}

arr := [5]int{1,2,3}

non-constant array bound length

​ 总结:slice 和数据的区别在于 有没有定义长度

map

maps1 := make(map[string]string)
key1 := "key1"
maps1[key1] = key1
s,ok := maps1[key1]
if ok {
    fmt.Println("hava key [",s,"]")
}

实现接口区别

golang

package main

type Dock struct {
    Sound string
}



func (this Dock) voice(a VoiceIFS) VoiceIFS {

    return this
}

package main

import "fmt"

type VoiceIFS interface {
    voice(VoiceIFS) VoiceIFS
}


func main()  {
    dock:= Dock{Sound : " ga ga ga "}

    var t VoiceIFS
    t = dock
    ifs := t.voice(dock)
    fmt.Println(ifs)
}

结果：

{ ga ga ga }

java

public interface VoiceIFS {
    VoiceIFS voice(VoiceIFS s) ;
}

public class Dock   implements VoiceIFS {

    private String sound ;

    public String getSound() {
        return sound;
    }

    public void setSound(String sound) {
        this.sound = sound;
    }

    @Override
    public VoiceIFS voice(VoiceIFS s) {
        return this;
    }

    @Override
    public String toString() {
        return "Dock{" +
                "sound='" + sound + '\'' +
                '}';
    }
}

public class TestVoiceIFS {

    public static void main(String[] args) {
        VoiceIFS s = new Dock();
        ((Dock) s).setSound(" ga ga ga");
        VoiceIFS voice = s.voice(s);

        System.out.println(voice);
    }

}

结果：

Dock{sound=' ga ga ga'}

总结:

java 实现结果需要implement 关键词来指定实现具体接口，而golang的话只需要与某个接口中的某个方法名字相同即可，golang更加松散，但是给我的感觉来说还是java的设计相对来说好一点 结构比较清晰，且golang的接口名字估计不能相同，

### 通过switch type 判断 接口类型

func main()  {
    doSomething(111,float32(1),"111")
}

func doSomething(item... interface{})  {
    for _,e := range item {
        v := reflect.ValueOf(e)
        typ := v.Interface()
        switch e.(type) {
        case int:
            i := typ.(int)
            i++
            fmt.Println("this is int interface,then do something...",i)
        case float32:
            f := typ.(float32)
            f += 1.08
            fmt.Println("this is float32 or float64 interface,then do something...",f)
        }
    }

}