结构体
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package main
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func main() {
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// TODO
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import "fmt"
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// 定义一个Person结构体
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type Person struct {
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Name string
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Age int
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}
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// 给Person结构体定义一个方法
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func (p Person) Greet() {
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fmt.Printf("Hello, my name is %s and I'm %d years old.\n", p.Name, p.Age)
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}
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// 嵌套结构体示例
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type Employee struct {
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Person
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JobTitle string
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}
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func main() {
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// 结构体初始化方式1:字段顺序
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p1 := Person{"Alice", 25}
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// 结构体初始化方式2:字段名指定
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p2 := Person{
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Name: "Bob",
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Age: 30,
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}
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// 访问结构体字段
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fmt.Println(p1.Name) // Alice
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fmt.Println(p2.Age) // 30
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// 调用结构体方法
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p1.Greet() // Hello, my name is Alice and I'm 25 years old.
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p2.Greet() // Hello, my name is Bob and I'm 30 years old.
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// 嵌套结构体初始化
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emp := Employee{
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Person: Person{
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Name: "Charlie",
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Age: 35,
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},
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JobTitle: "Developer",
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}
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// 访问嵌套结构体字段
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fmt.Println(emp.Name) // Charlie (提升字段)
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fmt.Println(emp.JobTitle) // Developer
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emp.Greet() // Hello, my name is Charlie and I'm 35 years old.
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}
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@ -1,5 +1,61 @@
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package main
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func main() {
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// TODO
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import "fmt"
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// 定义一个接口
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type Shape interface {
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Area() float64
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}
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// 定义一个结构体:Rectangle
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type Rectangle struct {
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Width, Height float64
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}
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// 实现接口方法:Area
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func (r Rectangle) Area() float64 {
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return r.Width * r.Height
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}
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// 定义另一个结构体:Circle
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type Circle struct {
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Radius float64
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}
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// 实现接口方法:Area
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func (c Circle) Area() float64 {
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return 3.14 * c.Radius * c.Radius
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}
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func main() {
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// 创建接口类型的切片
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shapes := []Shape{
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Rectangle{Width: 10, Height: 5},
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Circle{Radius: 7},
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}
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shapes2 := []Shape{
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Rectangle{Width: 20, Height: 10},
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Circle{Radius: 14},
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Rectangle{Width: 30, Height: 15},
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Rectangle{5, 5},
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}
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// 遍历并调用接口方法
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for _, shape := range shapes {
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fmt.Printf("Shape Area: %.2f\n", shape.Area())
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}
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// i := 0
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// for {
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// fmt.Printf("Shape Area: %.2f\n", shapes2[i].Area())
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// i++
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// if i >= len(shapes2) {
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// break
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// }
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// }
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for _, shape := range shapes2 {
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fmt.Printf("%.2f\n", shape.Area())
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}
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}
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