Go Methods and Interfaces

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Go Methods and Interfaces

1、Go does not have classes. However, you can define methods on struct types.

  The method receiver appears in its own argument list between the func keyword and the method name.

  

2、You can declare a method on any type that is declared in your package, not just struct types.

  However, you cannot define a method on a type from another package (including built in types).

  

3、Methods can be associated with a named type or a pointer to a named type.指標接收器與變數介面器是不一樣的。變數接收器會有拷貝,而指標接收器沒有拷貝。

  

4、interface由一系列方法組成。

  A value of interface type can hold any value that implements those methods.

  

5、A Stringer is a type that can describe itself as a string. The fmt package (and many others) look for this interface to print values.

    

6、類型通過實現那些方法來實現介面。 沒有顯式聲明的必要;所以也就沒有關鍵字“implements“。

  隱式介面解藕了實現介面的包和定義介面的包:互不依賴

  因此,也就無需在每一個實現上增加新的介面名稱,這樣同時也鼓勵了明確的介面定義。

7、error也是一內建介面。As with fmt.Stringer, the fmt package looks for the error interface when printing values.

  

8、Functions often return an error value, and calling code should handle errors by testing whether the error equals nil.

  

9、Read介面。

  

  

10、Package http serves HTTP requests using any value that implements http.Handler:

    

11、Package image defines the Image interface:

    

參考:https://tour.golang.org/methods/8  

 

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