Golang of Learning: interface

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package main //  defines an interface//  has two methods//  Note: Methods cannot be added functype ifile interface { Read (file string)   (buf []byte) Write (file string, buf []byte)}type ireader  interface {read (file string)   (buf []byte)}type iwriter interface { Write (File string, buf []byte)}//  defines a struct//  by the method defined below:// file also implements IFile  ireader iwriter all the methods//  so File implementation ifile  also implemented Ireader and iwritertype file struct  Methods in {}//  structure func  (f *file)  read (file string)   (buf []byte)  {return Methods in the  nil}//  structure func  (f *file)  write (file string, buf []byte)  {} Func main ()  {f := new (File)// file also implements Ifile ireader iwriter all methods//  So the file implements the ifile  also implements the Ireader and iwriter//  so these transitions are grammatically consistent var f1 ifile = fvar f2  ireader = fvar  F3 iwriter = ff. Read ("AA") F1. Read ("BB") F2. Read ("CC")// iwriter only defined the Write method F3.write ("DD",  []byte {1,2})}