'init'

demo/dem.go

@@ -0,0 +1,44 @@
+package main //同文件包的声明 需要保持一直
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	var s string = "golang你好"
+	fmt.Println(len(s))
+
+	for i, value := range s {
+		fmt.Printf("%d", "%c", i, value)
+	}
+	r := []rune(s)
+	for i := 0; i < len(r); i++ {
+		fmt.Println(r[i])
+	}
+	num1, _ := strconv.Atoi("666")
+	fmt.Println(num1)
+	//整数转成字符串
+	st1 := strconv.Itoa(88)
+	fmt.Println(st1)
+	//统计字符串中有几个相同的
+	count := strings.Count("golanggolang", "golang")
+	fmt.Println(count)
+	//不区分大小写
+	flag := strings.EqualFold("go", "GO")
+	fmt.Println(flag)
+	//区分大小写
+	fmt.Println("hello" == "HELLO")
+	//字符串替换
+	ss := strings.Replace("gogogo", "go", "golang", -1)
+	fmt.Println(ss)
+	//按照字符串，为分割符标识，将字符串进行切割分成字符数组
+	a := strings.Split("java-go", "-")
+	fmt.Println(a)
+	//大小写切换
+	fmt.Println(strings.ToLower("GO"))
+	fmt.Println(strings.ToUpper("go"))
+	//去除空格！
+	fmt.Println(strings.TrimSpace("   go   "))
+
+}

demo/demo01.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	var a int = 100
+	var b int = 30
+	c := sum(a, b)
+	fmt.Println(c)
+	test(32, 54)
+
+}
+
+// 函数的首字母大写可以被其他包的文件访问(类似于public)
+// 函数的首字母小写只能被本包访问(类似于private)
+func sum(a int, b int) int {
+	return a + b
+}
+func test(args ...int) {
+	for i := 0; i < len(args); i++ {
+		fmt.Println(args[i])
+
+	}
+}

demo/demo3.go

@@ -0,0 +1,37 @@
+package main
+
+import "fmt"
+
+type Animal struct {
+	Age    int
+	Weight float32
+}
+
+func (an *Animal) shou() {
+	fmt.Println("打击")
+}
+func (an *Animal) showinfo() {
+	fmt.Println("动物的体重", an.Age, an.Weight)
+
+}
+
+type Cat struct {
+	Animal
+	Age int
+}
+
+func (c *Cat) showInfo() {
+	fmt.Println("动物体重", c.Age, c.Weight)
+
+}
+
+// 对cat绑定特有的方法
+func (c *Cat) rs() {
+	fmt.Println("我是小猫")
+}
+func main() {
+	cat := &Cat{}
+	cat.Weight = 10
+	cat.Animal.Age = 30
+	fmt.Println(cat)
+}

demo/p2.go

@@ -0,0 +1,26 @@
+package main
+
+import "fmt"
+
+type person struct {
+	Name string
+	age  int
+}
+
+// 定义工厂的函数
+func NewPerson(name string) *person {
+	return &person{
+		Name: name,
+	}
+
+}
+func (p *person) SetAge(age int) {
+	if age >= 0 && age <= 150 {
+		p.age = age
+	} else {
+		fmt.Println("超出")
+	}
+}
+func (p *person) GetAge() int {
+	return p.age
+}

demo/te.go

@@ -0,0 +1,5 @@
+package main
+
+func main() {
+
+}

demo/test.go

@@ -0,0 +1,52 @@
+package main
+
+import "fmt"
+
+// 接口定义设计规范
+type SayHello interface {
+	SayHello()
+}
+type American struct {
+	Name string
+}
+
+func (person American) SayHello() {
+	fmt.Println("你好")
+}
+
+type chinese struct {
+	Name string
+}
+
+func (person chinese) SayHello() {
+	fmt.Println("chinese")
+}
+func (person chinese) tiaowu() {
+	fmt.Println("跳舞")
+}
+
+// 定义函数：接收接口的实例
+func greet(s SayHello) {
+	s.SayHello()
+
+	//断言控制语句的要求 判断这是chinese
+	ch, flag := s.(chinese)
+	if flag == true {
+
+		ch.tiaowu()
+	} else {
+		fmt.Println("no")
+	}
+}
+
+func main() {
+	var a [3]SayHello
+	a[0] = chinese{"1"}
+	a[1] = American{"hel"}
+	a[0].SayHello()
+
+	c := chinese{}
+	c.tiaowu()
+	c.SayHello()
+
+}

demo/test01.go

@@ -0,0 +1,26 @@
+package main
+
+import "fmt"
+
+type a interface {
+}
+type b interface {
+}
+
+type Stu struct {
+}
+
+func (s Stu) a() {
+	fmt.Println("aa")
+
+}
+func (s Stu) b() {
+	fmt.Println("bbb")
+}
+func main() {
+	var s Stu
+	var a = s
+	var b = s
+	a.b()
+	b.a()
+}