day9接口

src/study/day9Interface/main.go

@@ -0,0 +1,22 @@
+package main
+
+import "fmt"
+
+type www interface {
+	Write()
+}
+type ByteCounter int
+
+func (c *ByteCounter) Write(p []byte) (int, error) {
+	*c += ByteCounter(len(p))
+	return len(p), nil
+}
+
+func main() {
+	var c ByteCounter
+	c.Write([]byte("hello"))
+	fmt.Println(c)
+	name := "dugulp"
+	fmt.Fprintf(&c, "Hello, %s", name)
+	fmt.Println(c)
+}