map

bilibili/aceid/map/test1/test.go

@@ -0,0 +1,56 @@
+package main
+
+import "fmt"
+
+func main() {
+	var myMap1 map[string]string
+	if myMap1 == nil {
+		fmt.Println("myMap1是一个空map")
+	}
+	myMap1 = make(map[string]string, 10)
+	myMap1["one"] = "java"
+	myMap1["two"] = "c++"
+	myMap1["three"] = "php"
+	fmt.Println(myMap1)
+
+	myMap2 := make(map[string]string)
+	myMap2["one"] = "apple"
+	myMap2["two"] = "orange"
+	myMap2["three"] = "banana"
+	fmt.Println(myMap2)
+
+	myMap3 := map[string]string{
+		"one":   "php",
+		"two":   "golang",
+		"three": "lua",
+	}
+	fmt.Println(myMap3)
+
+	cityMap := make(map[string]string)
+	cityMap["China"] = "Beijing"
+	cityMap["Japan"] = "Tokyo"
+	cityMap["USA"] = "New York"
+	// 遍历
+	for key, value := range cityMap {
+		fmt.Printf("key = %s, value = %s\n", key, value)
+	}
+	// 删除
+	delete(cityMap, "Japan")
+	// 修改
+	cityMap["USA"] = "Shenyang"
+	for key, value := range cityMap {
+		fmt.Println("key = ", key, ", value = ", value)
+	}
+	changeValue(cityMap)
+	printMap(cityMap)
+}
+
+func printMap(cityMap map[string]string) {
+	for key, value := range cityMap {
+		fmt.Println("key = ", key, ", value = ", value)
+	}
+}
+
+func changeValue(cityMap map[string]string) {
+	cityMap["England"] = "London"
+}