feat(Go-StudyExample):包方法重构

example/originGoLanguage/Map_test.go

@@ -0,0 +1,42 @@
+/*
+ *  @Author : huangzj
+ *  @Time : 2020/7/13 14:22
+ *  @Description：
+ */
+
+package originGoLanguage
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestMap(t *testing.T) {
+	//没有初始化的是nil,不能进行赋值
+	var countryMap1 map[string]string
+	fmt.Println(countryMap1 == nil)
+
+	countryMap := make(map[string]string)
+	countryMap["a"] = "aCountry"
+	countryMap["b"] = "bCountry"
+	countryMap["c"] = "cCountry"
+	countryMap["d"] = "dCountry"
+
+	for key, value := range countryMap {
+		fmt.Println(key + " is " + value)
+	}
+
+	//获取Map的值
+	mValue, ok := countryMap["a"]
+	fmt.Println(ok, mValue)
+
+	mValue1, ok1 := countryMap["aaaa"]
+	fmt.Println(ok1, mValue1)
+
+	//删除map中的元素
+	delete(countryMap, "a")
+	delete(countryMap, "b")
+	for key, value := range countryMap {
+		fmt.Println(key + " is " + value)
+	}
+}