From 30b377189b56e52a90888af94718de000ddc1d14 Mon Sep 17 00:00:00 2001
From: Tinywan <756684177@qq.com>
Date: Sat, 25 Aug 2018 18:02:27 +0800
Subject: [PATCH] =?UTF-8?q?Unicode=E5=92=8CUTF-8=E4=B9=8B=E9=97=B4?=
 =?UTF-8?q?=E7=9A=84=E5=85=B3=E7=B3=BB?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 demo/interface/demo01.go | 24 ++++++++++++++++++++++--
 demo/string/rune01.go    | 24 ++++++++++++++++++++++++
 2 files changed, 46 insertions(+), 2 deletions(-)
 create mode 100644 demo/string/rune01.go

diff --git a/demo/interface/demo01.go b/demo/interface/demo01.go
index 6187199..38e5642 100644
--- a/demo/interface/demo01.go
+++ b/demo/interface/demo01.go
@@ -1,10 +1,30 @@
 package main
 
-// interface define 元音
+import (
+	"fmt"
+)
+
+// interface define 元音,接口中只能定义方法哦
 type VowelsFinder interface {
 	FindVowels() []rune
 }
 
-func main() {
+type MyString string
 
+// 方法
+func (ms MyString) FindVowels() []rune {
+	var vowels []rune
+	for _, rune := range ms {
+		if rune == 'a' || rune == 'e' || rune == 'i' || rune == 'o' || rune == 'u' {
+			vowels = append(vowels, rune)
+		}
+	}
+	return vowels
+}
+
+func main() {
+	name := MyString("Sam Anderson")
+	var v VowelsFinder
+	v = name
+	fmt.Printf("Vowels are %c", v.FindVowels())
 }
diff --git a/demo/string/rune01.go b/demo/string/rune01.go
new file mode 100644
index 0000000..27925f6
--- /dev/null
+++ b/demo/string/rune01.go
@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+	"unicode/utf8"
+)
+
+func main() {
+	s := "hello 你好"                // 8 = 5个字符 + 1个空格 + 2个汉字
+	fmt.Println("len(s):", len(s)) // len(s): 12
+
+	var str = "hello 你好"
+
+	//golang中string底层是通过byte数组实现的，直接求len 实际是在按字节长度计算  所以一个汉字占3个字节算了3个长度
+	fmt.Println("len(str):", len(str))
+
+	//以下两种都可以得到str的字符串长度
+
+	//golang中的unicode/utf8包提供了用utf-8获取长度的方法
+	fmt.Println("RuneCountInString:", utf8.RuneCountInString(str))
+
+	// 通过rune类型处理unicode字符
+	fmt.Println("rune:", len([]rune(str)))
+}