'init'

.gitignore

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+.idea/
+test

demo/dem.go

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+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

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+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

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+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

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+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

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+package main
+
+func main() {
+
+}

demo/test.go

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+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

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+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()
+}

main.go

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+package main
+
+import "fmt"
+
+func GetSum() func(int) int {
+	var sum int = 0
+	return func(x int) int {
+		sum = sum + x
+		return sum
+	}
+}
+func add(num1 int, num2 int) int {
+	defer fmt.Println(num1) //3
+	defer fmt.Println(num2) //进入栈中  栈的特点是 先进后出2
+	var sum int = num1 + num2
+	fmt.Println(sum) //先执行1
+	return sum       //4
+}
+
+func main() {
+	f := GetSum()
+	fmt.Println(f(1))
+	fmt.Println(f(2))
+	fmt.Println(f(3))
+	fmt.Println(add(30, 60))
+}

main/defers.go

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+package main
+
+import (
+	"errors"
+	"fmt"
+)
+
+func t() error {
+	a := 10
+	b := 5
+	if b == 0 {
+
+		return errors.New("除数不能为零")
+
+	} else {
+		res := a / b
+		fmt.Println(res)
+
+		return nil
+	}
+}
+func main() {
+	err := t()
+	if err != nil {
+		fmt.Println("自定义错误")
+		//停止后面程序继续执行
+		panic(err)
+	}
+	fmt.Println("继续执行")
+
+	var scores [5]int
+	scores[0] = 10
+	scores[1] = 10
+	scores[2] = 30
+	scores[3] = 40
+	for i := 0; i < len(scores); i++ {
+		fmt.Println(scores[i])
+		fmt.Scanln(&scores[i])
+	}
+	//索引用key接收 value用于里面的值
+	for key, value := range scores {
+		fmt.Println(key, value)
+
+	}
+}

main/der.go

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+package main
+
+import "fmt"
+
+func main() {
+	var book Book
+	book.auth = "1u1"
+	book.name = "aihda"
+	changebook(&book)
+	fmt.Println(book)
+
+}
+func changebook(book *Book) {
+	book.auth = "77"
+}
+
+type Book struct {
+	name string
+	auth string
+}

main/p1.go

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+package main
+
+import "fmt"
+
+type Student struct {
+	Name string
+}
+
+// 函数
+func mthod(s Student) {
+	fmt.Println(s.Name)
+}
+
+func mthod1(s *Student) {
+	fmt.Println((*s).Name)
+}
+func (s *Student) test02() {
+	fmt.Println(s.Name)
+}
+func main() {
+	var stu = Student{"笑傲"}
+	mthod(stu)
+	mthod1(&stu)
+	(&stu).test02()
+	var s = Student{
+		Name: "xio",
+	}
+	fmt.Println(s)
+	var s3 *student = &student{
+		age: 19,
+	}
+	fmt.Println(s3)
+
+}

main/pg.go

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+package main
+
+import "fmt"
+
+func main() {
+	var a [7]int = [7]int{4, 5, 6, 6, 4, 7, 7}
+	var slice []int = a[2:4]
+	fmt.Println(len(slice))
+	slice2 := append(slice, 55, 55)
+	fmt.Println(slice2)
+	fmt.Println(len(slice2))
+	//默认分配10个空间
+	var ip map[int]string
+	//key不能重复,前面会替换后面那个 value 可以重复
+	ip = make(map[int]string, 10)
+	ip[103883] = "张三"
+	ip[173718] = "李四"
+
+	ip[173718] = "李"
+	fmt.Println(ip)
+	//查找
+	value, flag := ip[103883]
+	fmt.Println(value)
+	fmt.Println(flag)
+	fmt.Println(len(ip))
+}

main/pp.go

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+package main
+
+import "fmt"
+
+func main() {
+	tes()
+
+}
+
+func tes() int {
+	//利用defer+recover来捕获错误：defer加匿名函数调用
+	defer func() {
+		err := recover()
+		if err != nil {
+			fmt.Println("错误已经捕获")
+			fmt.Println(err)
+		}
+	}()
+	num02 := 10
+	num01 := 0
+	return num02 / num01
+}

main/project.go

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+package main
+
+import "fmt" //导入别的包 先执行别的包里面 再执行自己包里面
+
+//做变量初始化
+
+// 后是 init函数 全局变量再执行，main函数调用
+
+var num int = test()
+
+func test() int {
+	fmt.Println("test")
+	return 10
+}
+func init() {
+	fmt.Println("1")
+
+}
+func main() {
+	fmt.Println("2")
+
+}

main/pt.go

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+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	//创建对象实例
+	var T teacher = teacher{}
+	T.Name = "dakjda"
+	fmt.Println(T)
+	//使用指针创建对象
+	var t *teacher = new(teacher)
+	(*t).school = "没用"
+	(*t).age = 19
+	fmt.Println(t)
+	var s student
+	var p person
+	s = student(p)
+	fmt.Println(s)
+}
+
+// 定义结构体 方便内存管理
+type teacher struct {
+	Name   string
+	age    int64
+	school string
+}
+
+type student struct {
+	age int
+}
+type person struct {
+	age int
+}

main/pu.go

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+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	//定义切片：make函数的三个参数：1.切片类型。2.切片的长度
+	slice := make([]int, 4, 20)
+	fmt.Println(slice)
+	fmt.Println(len(slice))
+	fmt.Println(cap(slice))
+	slice[0] = 66
+	slice[1] = 88
+	slice1 := []int{3, 4, 5}
+	fmt.Println(slice1)
+	//按照数组的方式操作
+	for key, value := range slice1 {
+		fmt.Println(key, value)
+	}
+}