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38 lines
972 B
Markdown
38 lines
972 B
Markdown
# 18.5 接口
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（1）如何检测一个值v是否实现了一个接口`Stringer`：
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```go
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if v, ok := v.(Stringer); ok {
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fmt.Printf("implements String(): %s\n", v.String())
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}
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```
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（2）如何使用接口实现一个类型分类函数：
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```go
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func classifier(items ...interface{}) {
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for i, x := range items {
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switch x.(type) {
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case bool:
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fmt.Printf("param #%d is a bool\n", i)
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case float64:
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fmt.Printf("param #%d is a float64\n", i)
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case int, int64:
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fmt.Printf("param #%d is an int\n", i)
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case nil:
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fmt.Printf("param #%d is nil\n", i)
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case string:
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fmt.Printf("param #%d is a string\n", i)
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default:
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fmt.Printf("param #%d’s type is unknown\n", i)
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}
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}
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}
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```
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## 链接
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- [目录](directory.md)
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- 上一章：[运算符模板和接口](17.4.md)
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- 下一节：[字符串](18.1.md) |