# 显示一个类型的方法集

我们的最后一个例子是使用reflect.Type来打印任意值的类型和枚举它的方法：

*gopl.io/ch12/methods*

```
// Print prints the method set of the value x.
func Print(x interface{}) {
	v := reflect.ValueOf(x)
	t := v.Type()
	fmt.Printf("type %s\n", t)

	for i := 0; i < v.NumMethod(); i++ {
		methType := v.Method(i).Type()
		fmt.Printf("func (%s) %s%s\n", t, t.Method(i).Name,
			strings.TrimPrefix(methType.String(), "func"))
	}
}
```

reflect.Type和reflect.Value都提供了一个Method方法。每次t.Method(i)调用将一个reflect.Method的实例，对应一个用于描述一个方法的名称和类型的结构体。每次v.Method(i)方法调用都返回一个reflect.Value以表示对应的值（§6.4），也就是一个方法是帮到它的接收者的。使用reflect.Value.Call方法（我们这里没有演示），将可以调用一个Func类型的Value，但是这个例子中只用到了它的类型。

这是属于time.Duration和`*strings.Replacer`两个类型的方法：

```
methods.Print(time.Hour)
// Output:
// type time.Duration
// func (time.Duration) Hours() float64
// func (time.Duration) Minutes() float64
// func (time.Duration) Nanoseconds() int64
// func (time.Duration) Seconds() float64
// func (time.Duration) String() string

methods.Print(new(strings.Replacer))
// Output:
// type *strings.Replacer
// func (*strings.Replacer) Replace(string) string
// func (*strings.Replacer) WriteString(io.Writer, string) (int, error)
```


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