reader_interface_implement.go

package main

import (
        "io"
        "fmt"
)

type DummyReader struct {
}

func (d DummyReader) Read(p []byte) (n int, err error) {
        p[0] = 65
        return 1, nil
}

func main() {
        var r io.Reader = DummyReader{}
        fmt.Println("value of r is", r)
        fmt.Printf("type of r is %T\n", r)
        p := make([]byte, 10)
        n, _ := r.Read(p)
        fmt.Println(p[:n])

}